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会议名称:

International congress and exhibition on sustainable civil infrastructures

召开年:

2017

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会议文集:

Materials for sustainable infrastructure: 1st international congress and exhibition on sustainable civil infrastructures (GeoMEast 2017), 2017

主办单位:

Soil-Structure Interaction Group in Egypt

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  • 题名 作者 来源 发表时间 操作
  • Mechanical Behavior of Hydraulic Concrete to Extreme Service Temperatures: The Influence of the Particle Size

    作者:Kenouza Yamina; 会议名称:International congress and exhibition on sustainable civil infrastructures 2017年

    The climate of the Saharan and sub-Saharan regions is characterized by low temperatures during the winter which can reach negative values during the night and high temperatures during the summer, sometimes exceeding 60 ° C. The behavior of the concrete to extreme service temperatures is currently not mastered since changes in strength depending on the local temperature is not taken into account in the design of structures. In this regard; the present work aims to study the sensitivity of hydraulic concrete in its thermal environment, such as cold regions, moderate and warm, taking into account the influence of the particle size of aggregates. The originality of this work lay in the study of different types of concretes (0/8, 0/16 and 0/25), mortars (0/3 and 0/5) and a micro-concrete (0/5). The results show a significant effect of particle size (Dmax) depending on the temperature, as well as each type of studied materials (concrete, mortar and micro-concrete) has its own behavior towards the temperature in the range studied.

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  • Mechanical Behavior of Hydraulic Concrete to Extreme Service Temperatures: The Influence of the Particle Size

    Kenouza Yamina;

    International congress and exhibition on sustainable civil infrastructures

    2017年

  • Evaluation of Non-nuclear Alternatives to Replace the Nuclear Density Gauge During Compaction Quality Control of Unbound Pavement Layers

    作者:Ayman W. Alium;Yusuf Mehta;Manuel Celaya;Giri Venkiteela; 会议名称:International congress and exhibition on sustainable civil infrastructures 2017年

    Pavement performance is highly dependent on several factors that include: structural adequacy, material properties, traffic loading, and construction quality. The quality of subgrade or base/subbase compaction also significantly affects the performance of pavements; predominantly flexible pavements. In particular, the majority of the distresses in flexible pavements are mainly attributed to the compaction defect in these layers. In current practice, the compaction quality of these layers is usually quantified using the nuclear density gauge (NDG). However, several concerns arise due to the use of the NDG. This study was initiated with the aim of evaluating the sensitivity of the parameters measured using non-nuclear methods/devices to moisture content, compaction effort, testing time after compaction, and aggregate type. To fulfill this objective, a laboratory procedure for compacting large samples was developed. This procedure facilitated testing using three non-nuclear devices: Briaud compaction device (BCD), light weight falling deflectometer (LWD), and dynamic cone penetrometer (DCP). Four types of aggregates, two subgrade soils, one dense graded aggregate, and one recycled concrete aggregates, were selected to comprehensively cover a wide range of subgrade and base/subbase materials. Each device was evaluated for accuracy and repeatability. The sensitivity of the results measured from each device to moisture content, compaction effort applied, and testing time was also evaluated. Based on testing results, it was concluded that the DCP was most sensitive to detecting changes in the measured parameters. In addition, precision of the DCP was similar to other non-nuclear devices.

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  • Evaluation of Non-nuclear Alternatives to Replace the Nuclear Density Gauge During Compaction Quality Control of Unbound Pavement Layers

    Ayman W. Alium;Yusuf Mehta;Manuel Celaya;Giri Venkiteela;

    International congress and exhibition on sustainable civil infrastructures

    2017年

  • Fuzzy Logic Based Modeling for Pavement Characterization

    作者:Mercado Perez Jose Luis;Beltran Calvo Gloria Ines; 会议名称:International congress and exhibition on sustainable civil infrastructures 2017年

    Maintenance decisions of existing pavements are highly dependent on stiffness and deterioration conditions, throughout their operation. A methodology based on non-conventional fuzzy logic is proposed in this work to evaluate the structural, functional and deterioration conditions of pavements by Fuzzy Inference Systems (FIS). The developed systems, allowed representing expert knowledge and linguistic variables of subjective and qualitative nature, commonly used to describe the severity levels of deterioration, strength and stiffness; thus FIS can be involved into structural characterization of pavements. Analyses were conducted using a database obtained from field tests performed on several pavement systems of toll roads in Colombia. Information about layer thicknesses, magnitude and severity of structural distresses, parameters and indicators derived from deflection test and International Roughness Index measures (IRI) were used. Results were expressed linguistically to make easier the interpretation and understanding. Based on the high quality of results obtained, it seems reasonable to conclude that the proposed methodology could be used confidently for a pavement characterization and sectorization purposes, with low computational cost.

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  • Fuzzy Logic Based Modeling for Pavement Characterization

    Mercado Perez Jose Luis;Beltran Calvo Gloria Ines;

    International congress and exhibition on sustainable civil infrastructures

    2017年

  • Effect of Spray Dryer Absorbers as Mix Enhancer on HMA Performance

    作者:Clayton Cloutier;Emil G. Bautista;Ahmed F. Faheem;Konstantin Sobolev; 会议名称:International congress and exhibition on sustainable civil infrastructures 2017年

    For many years Coal Combustion Products (CCPs), and, especially fly ash, have been effectively used as a partial replacement of portland cement in different types of concrete, as well as in flowable fills, embankments and soil stabilization. On the other hand, the use of CCPs in asphalt pavements has been very limited. Only few researchers have reported on the benefits of CCPs in asphalt. This research investigates the effect of Spray Dryer Absorber (SDA) CCP on HMA performance with respect to laboratory measured performance indicators at both the mastic and mixture level using a PG58-28 unmodified binder. In this study, two SDA materials and a reference limestone filler was introduced to an asphalt mastic at 0, 5, 15, and 25% by volume. After mastic evaluation, only one of the SDA materials was introduced to an asphalt mix at 10% replacement of the binder by mass and compared to a standard 3 million ESAL control mix. With respect to performance, all mastics and mixtures were tested for aging index, fatigue, and low-temperature thermal cracking resistance. The HMA mix with SDA had the higher resistance to aging where the aging index was significantly lower/reduced than that of the control mix. The same trend was observed for repeated fatigue loading. Overall, the SDA mix outperformed the control HMA. The reported study proves that replacing 10% by mass of the asphalt binder with SDA does not hinder workability, and improves aging resistance, moisture damage resistance, and fatigue life. This implies a significant impact associated with CCPs utilization in flexible pavements rather than landfilling.

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  • Effect of Spray Dryer Absorbers as Mix Enhancer on HMA Performance

    Clayton Cloutier;Emil G. Bautista;Ahmed F. Faheem;Konstantin Sobolev;

    International congress and exhibition on sustainable civil infrastructures

    2017年

  • Study on Mixing Proportion for AC-13C Asphalt Mixture and Construction Control

    作者:Wu Jing;Wu Li; 会议名称:International congress and exhibition on sustainable civil infrastructures 2017年

    With good waterproof performance and high stability under high temperature, SBS modified AC-13C asphalt mixture can meet the requirements in highway construction nowadays. In this article, the Loudi test highway section is mainly used to carry out discussions on the design and test of the production mix proportion for AC-13C asphalt mixture, and at the same time studies are carried out for the construction methods such as mixing and rolling, to further improve highway pavement quality.

    关键字:AC-13C; Asphalt mixture; Mix proportion; Construction control

  • Study on Mixing Proportion for AC-13C Asphalt Mixture and Construction Control

    Wu Jing;Wu Li;

    International congress and exhibition on sustainable civil infrastructures

    2017年

  • Optimum Partial Replacement of Cement by Rice Husk Ash and Fly Ash Based on Complete Consumption of Calcium Hydroxide

    作者:Winai Ouypornprasert;Narong Traitruengtatsana;Kong Kamollertvara; 会议名称:International congress and exhibition on sustainable civil infrastructures 2017年

    The objective of this technical paper was to propose the optimum partial replacement of cement (PRC) by rice husk ash (RHA) and fly ash (FA) based on the complete consumption (CC) of calcium hydroxide (CH) from hydration and the strength activity index (SAT) based on equivalent calcium silicate hydrate (C-S-H) as well as the propagation of uncertainty due to randomness inherent in main chemical compositions in cement, RHA and FA. Firstly the hydration and pozzolanic reactions as well as stoichiometry were reviewed. Then the optimum PRC by RHA and FA based on CC of CH was formulated. The long-term SAI would be proposed based on equivalent C-S-H. Contribution to strength by calcium aluminate hydrate and calcium ferrite hydrate would be transformed to equivalent C-S-H. Based on the reasons mentioned above and the given values of strength for the age of 360 days, the long-term SAI could be defined. This concept could be extended for the SAI at any age based on Bogue's curve and nano-structures of C-H-S gel. After that the propagation of uncertainty due to main chemical compositions in cement, RHA and FA was discussed. The linear characteristic of the gradient of a function was derived for an estimate. Monte-Carlo simulations together with Goodness-Of-Fit tests were proposed for the better estimates. The reliability analyses for applying the suitable PRC were reviewed. Finally an applicability of the concepts mentioned above based on statistical data of materials available was demonstrated. The results from analyses were consistent with the tested results by the authors and other researchers. The results of this study provided guidelines of suitable utilization of RHA and FA for PRC. It was interesting to note that these concepts could be extended to optimize PRC by combination of other types of pozzolan which were described in the other papers of the authors.

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  • Optimum Partial Replacement of Cement by Rice Husk Ash and Fly Ash Based on Complete Consumption of Calcium Hydroxide

    Winai Ouypornprasert;Narong Traitruengtatsana;Kong Kamollertvara;

    International congress and exhibition on sustainable civil infrastructures

    2017年

  • Use of Rice Husk Ash (RHA) as a Sustainable Cementitious Material for Concrete Construction

    作者:Mohammad Badrul Ahsan;Zahid Hossain; 会议名称:International congress and exhibition on sustainable civil infrastructures 2017年

    Use of supplementary construction materials in concrete industries has become a great interest in recent years. Stringent guidelines of the Unites States Environmental Protection Agency (EPA) influence the use of recycled materials in construction industry. Furthermore, there is an eminent shortage of the predominately used fly ashes from local sources generated by coal plant industries in Arkansas. On the other hand, rice husk ash (RHA), a by-product of the rice milling process, has high potential of being a supplementary cementing material. The RHA generated by Riceland Foods, the largest grain processing industry in the United States located in Arkansas, is treated as waste materials. It has become a financial burden to local famers due to its ever increasing handling, storage and disposal costs. The RHA consists of non-crystalline silica, which proves it as a very reactive pozzolanic material in mortar and concrete. To this end, laboratory-based experimental study investigated the performance of a locally available RHA as a supplement of Type-I Ordinary Portland Cement (OPC). Properties of concrete with different percentages of RHA (10% and 20% by weight) were investigated in this study. Fresh concrete properties (slump, unit weight, air entrainment etc.) as well as mechanical properties (compressive, tensile, flexural strength) of hardened concrete were determined. Additionally, alkali-silica reaction (ASR) test was conducted on mortar bars to evaluate cracking and expansion of concrete while exposed to adverse weather. It was found that, RHA particles were 13 times coarser than the cement particles. Use of this bulk RHA yielded significant strength reduction of the RHA modified concrete compared to the control sample. The maximum compressive strength gained by 10% RHA-modified concrete was 56% of that of the control specimen. Tensile and flexural strengths achieved by 10% replacement level were 76% and 96%, respectively, of those of the control samples. Moreover, the ASR test revealed that the bulk RHA was very reactive. Local construction industries can use this RHA as flowable fill as an alternative of cement and fly ash.

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  • Use of Rice Husk Ash (RHA) as a Sustainable Cementitious Material for Concrete Construction

    Mohammad Badrul Ahsan;Zahid Hossain;

    International congress and exhibition on sustainable civil infrastructures

    2017年

  • Investigation on the Effect of Anti Stripping Additives on the Moisture Sensitivity of Bituminous Concrete

    作者:A.U. Ravi Shankar;Goutham Sarang;B.M. Lekha;Calvin Carlton-Carew; 会议名称:International congress and exhibition on sustainable civil infrastructures 2017年

    Moisture damage is one of the most common reasons for the premature deterioration of Hot Mix Asphalt (HMA) pavements. Over the years, extensive research has been carried out by scientists and engineers on this subject; however, pavements still succumb to early failure from infiltrating moisture. A very popular method of minimizing the moisture susceptibility of asphalt pavements is by the use of anti-stripping agents. These additives are chemical substances that alter the physicochemical properties of the asphalt by making it more hydrophobic. This study focuses on the effect of anti-stripping agents on the moisture susceptibility of Bituminous Concrete (BC) mixture. The anti-stripping agents used were hydrated lime and Zycosoil. Three mix types were studied, namely; BC mix without additive, BC mix with hydrated lime and BC mix with Zycosoil. Viscosity Grade (VG) 30 bitumen was used in all three groups of samples. Marshall mix design method was adopted and specimens were prepared at bitumen contents 4.5, 5.0, 5.5, 6.0, 6.5 and 7.0% by weight of mixture. Volumetric properties and Marshall characteristics were determined for each specimen, and using them, the Optimum Binder Content for each mixture was obtained. Moisture susceptibility of mixtures was assessed using Tensile Strength Ratio, Retained Stability and Stripping Value. From the experimental results, it is observed that the addition of anti-stripping agents had a significant positive influence on the results of the test properties being evaluated in each test.

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  • Investigation on the Effect of Anti Stripping Additives on the Moisture Sensitivity of Bituminous Concrete

    A.U. Ravi Shankar;Goutham Sarang;B.M. Lekha;Calvin Carlton-Carew;

    International congress and exhibition on sustainable civil infrastructures

    2017年

  • The Strength of Lightly Cemented Power Plant Ash

    作者:Felix N. Okonta;Thabo Falayi;Roshuma Makhado; 会议名称:International congress and exhibition on sustainable civil infrastructures 2017年

    Coal ash from most of Eskom power plants consists of 70-85% fly ash and 15-30% bottom ash. A total of 25 million tons of ash is produced from approximately 109 million tons of coal per annum. Small percentage of the ash were used in cement production and other construction applications and almost 80% of the ash were disposed into ash dams. The need for high volume utilization is important because of the cost of disposal and associated environmental impact. The mechanical properties of Eskom ash that were stabilized with cement was investigated. Specimens of ash were stabilized with 2% to 10% of rapid hardening Portland cement (52.5R), and compacted at two different moulding water content; (a) the optimum moisture contents of stabilized specimens (15%—19%) and (b) moisture content wet of the OMC (30%). The unconfined compressive strength (UCS), soaked UCS, secant modulus and microstructure of the stabilized specimens were evaluated. The result indicated that specimens that were compacted at 30% moisture content mobilized greater UCS than those that were compacted at OMC. For specimens that there stabilized with high cement content of 8%-10% and compacted at OMC, soaking for 24 h only indicated a marginal reduction in UCS. The increase in secant modulus with cement content was nonlinear and indicated a decreasing rate with increase in cement content. The XRD and SEM results revealed that strength development was associated with the predominance of calcium silicate hydrate (CSH) and needle shaped ettringite in cement stabilized ash. Based on limited test data, only specimens that were stabilized at 30% moisture content and with greater than 4% cement met the SANS (2007) criteria for masonry and TRH (2010) criteria for pavement backfill.

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  • The Strength of Lightly Cemented Power Plant Ash

    Felix N. Okonta;Thabo Falayi;Roshuma Makhado;

    International congress and exhibition on sustainable civil infrastructures

    2017年

  • Sustainable Application of Quarry Byproducts Mixed with Large Size Unconventional Aggregates for Improved Performance

    作者:Issam Qamhia;Hasan Kazmee;Erol Tutumluer;Hasan Ozer; 会议名称:International congress and exhibition on sustainable civil infrastructures 2017年

    With recent focus on sustainable construction practices and the ever-increasing transportation costs and scarcity of natural resources, integration of large-size unconventional and marginally acceptable aggregates, such as quarry by-products (QB), and making their routine use in construction specifications is becoming imperative. In this study, the stability of large-size aggregates is increased by adding QB as sand- and smaller-sized particles to fill up the voids. Adding QBs is expected to increase density and provide stability for better aggregate interlock, and therefore, to increase the subgrade strength and eventually improve the road's rutting performance. In order to determine the appropriate weight mix ratio of the large-size aggregates and the fine QB materials, a steel box with dimensions 610 mm by 610 mm by 533 mm was built to assess the packing of the two materials. One of the sides of the box was designed to have a transparent Plexiglas that enabled observation of the QB percolation into the voids of the large-sized aggregates, which were added in multiple lifts. The QB materials were then evenly spread on the surface of each lift and compacted with a laboratory-sized roller compactor. Different mix ratios, support conditions, and moisture contents of the QBs were investigated. The study concluded that 25% QB by the dry weight of the large aggregates is an appropriate amount to be used for both one- and two-lift construction practices of this composite weak subgrade replacement aggregate material, i.e., aggregate subgrade, in the field. The laboratory results will be implemented in the field by constructing test sections for unpaved construction platform and asphalt-paved low volume road applications and monitoring them for rutting performance using an accelerated pavement testing device.

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  • Sustainable Application of Quarry Byproducts Mixed with Large Size Unconventional Aggregates for Improved Performance

    Issam Qamhia;Hasan Kazmee;Erol Tutumluer;Hasan Ozer;

    International congress and exhibition on sustainable civil infrastructures

    2017年

  • The Application Analysis of Fly Ash in Magnesium Phosphate Cement

    作者:Rui Huang;Xiangxing Kong; 会议名称:International congress and exhibition on sustainable civil infrastructures 2017年

    The addition of fly ash into magnesium phosphate-base material will reduce the original compressive strength, flexural strength and abrasion resistance of magnesium phosphate cement, the expansion character of it will increase as the amount of fly ash increase. With the increase of the dosage of fly ash, the compressive strength of pure magnesium phosphate cement will reduce after the first increases, and the flexural strength and abrasion resistance of magnesium phosphate cement will decrease with the increase of the dosage of fly ash. But the ultimate strength could meet the need of practical engineering if the dosage is appropriate. The addition of fly ash can help reduce the cost and improve the properties of phosphate cement-based repair material. Propriate dosage of fly ash into the cement could help improve its liquidity, adjust the setting time and improve the bonding degree of magnesium phosphate cement with portlant cement concrete. So it could be better used in many areas such as patching material, oil well cement and waste disposal and so on.

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  • The Application Analysis of Fly Ash in Magnesium Phosphate Cement

    Rui Huang;Xiangxing Kong;

    International congress and exhibition on sustainable civil infrastructures

    2017年

  • Thermoelasticity, Superelasticity and Nanoscale Aspects of Structural Transformations in Shape Memory Alloys

    作者:Osman Adiguzel; 会议名称:International congress and exhibition on sustainable civil infrastructures 2017年

    Shape memory alloys have a peculiar property to return to a previously defined shape on heating after deformation in low temperature product phase region. These alloys take place in a class of functional materials due to the response to the variation of temperature, and they are used shape memory elements in a wide range of industry; in particular, they are used in the construction sector, aeronautical industry due to the energy dissipation properties. Shape memory effect is facilitated by martensitic transformation which is a solid state phase transformation and occurs in thermal manner in material on cooling from high temperature parent phase region. This transformation is governed by changes in the crystalline structure of the material. Thermal induced martensite occurs as martensite variants, twinned martensite, in self-accommodating manner on cooling from high temperature parent phase region. Mechanically deformation of these alloys in martensitic state proceeds through martensite variant reorientation by the detwinning process. Martensitic transition occurs as self-accommodated martensite with lattice invariant shears which occur in two opposite directions, <110>-type directions on the {110}-type plane of austenite matrix. In addition, shape memory alloys can exhibit another property called superelasticity performed in only mechanical manner. These alloys can be deformed just over austenite finish temperature, and recover the original shape on releasing the stress in superelastic manner. Copper based alloys exhibit this property in metastable P-phase region, which has bcc-based structures at high temperature parent phase field and these structures martensiticaly turn into the layered complex structures following two ordered reactions on cooling.

    关键字:Thermoelasticity; Superelasticity; Shape memory effect; Lattice twinning; Lattice invariant shear

  • Thermoelasticity, Superelasticity and Nanoscale Aspects of Structural Transformations in Shape Memory Alloys

    Osman Adiguzel;

    International congress and exhibition on sustainable civil infrastructures

    2017年

  • Research on the Opportunity of Construction Method Conversion in Upper-Soft and Lower-Hard Stratum Based on Pressure Arch Theory

    作者:Wei Wang;Hengwen Zhang;Jiasheng Bian; 会议名称:International congress and exhibition on sustainable civil infrastructures 2017年

    In order to determine the construction method conversion opportunity from Cross Diaphragm with Step method to three-bench method of Zi-Zhi Tunnel, this paper takes the shallow buried excavation section of the tunnel as an example, where the stratum is upper-soft and lower-hard. Considering different intersection positions between tunnel face and the interface of stratum, based on the pressure arch theory, the change laws for the pressure arch thickness under different conditions were analyzed by FLAC~(3D). Then, a construction method conversion opportunity is derived. Meanwhile, the rationality of conversion opportunity is validated by the field monitoring. The results indicate that: the pressure arch thickness reaches a stable state and self-stable ability of surrounding rock reaches its maximum when the distance between tunnel bottom and the interface of strata is greater than 13 m. Hence, it is suggested to convert the construction method when the distance is greater than 13 m; the stable value and the convergence rate of vault subsidence are both below warning value in site, which can meet the safety and economic benefits of engineering.

    关键字:Pressure arch; Upper-soft and lower-hard; Construction method conversion

  • Research on the Opportunity of Construction Method Conversion in Upper-Soft and Lower-Hard Stratum Based on Pressure Arch Theory

    Wei Wang;Hengwen Zhang;Jiasheng Bian;

    International congress and exhibition on sustainable civil infrastructures

    2017年

  • Tunnel Boring Machine Advance Ground Investigation in Rockburst-Prone Ground Conditions on Neelum Jhelum Project

    作者:Irfan Ullah;Gary Peach;Muhammad Nadeem; 会议名称:International congress and exhibition on sustainable civil infrastructures 2017年

    This paper details the methods by which various advance ground investigation methodologies were deployed on two Tunnel Boring Machines (TBMs) working on the Neelum Jhelum Hydro-power project. The project is located in the Azad Kashmir region of northeast Pakistan, in the foothills of the Himalayan range, with overburdens up to 1,870 m and high horizontal stresses, and with complex and challenging geology. The lack of previous project experience in similar conditions, required the use of a wide variety of geological prediction methods and systems. The geological phenomenon of greatest concern was rockbursts: although expected they nevertheless presented a significant danger to personnel and equipment. The ability to predict the likelihood, location, severity and number of rockburst directly impacts upon the tunnel safety and daily production rates. The advanced prediction methods used on this project include forward probing; Tunnel Seismic Tomography (TST), TBM boring parameter analysis, in-situ stress measurements, short term rockburst prediction and continuous microseismic monitoring. This paper describes the various methodologies and how the individual data was integrated on a day-to-day basis to support TBM operations.

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  • Tunnel Boring Machine Advance Ground Investigation in Rockburst-Prone Ground Conditions on Neelum Jhelum Project

    Irfan Ullah;Gary Peach;Muhammad Nadeem;

    International congress and exhibition on sustainable civil infrastructures

    2017年

  • Estimation of Settlement and Vibration on the Surface Due to the Construction of East-West Metro Tunnels in Kolkata, India

    作者:Aniruddha Sengupta;Raj Banerjee;Srijit Bandyopadhyay; 会议名称:International congress and exhibition on sustainable civil infrastructures 2017年

    Kolkata, located on the bank of River Ganges in India, is considered to be one of the most densely populated cities in the world. It has an underground metro rail connection cutting across the city running predominantly in the north-south direction. Another underground metro rail connection is being built in the east-west direction connecting the heart of the city to the railway stations and the airport. As a part of the project, twin tunnels of diameter 6.1 m and 15 m apart are being constructed below the Ganges and through the most congested part of the city. The tunnels are located at a depth between 17 m and 24 m below the ground surface. The soil layers in Kolkata essentially consists of soft clays (clayey silt to silty clay) deposited by the river with layers of dense sand at much greater depth. Several old heritage structures have been identified along the route of the E-W metro. These structures are located between 19 m and 33 m from the centerline of the tunnels. Damage to these heritage buildings during the construction of the tunnels due to excessive settlement and/or vibration is a concern. Both static and dynamic finite element analyses have been performed to estimate the settlement and the vibration at those heritage structures due to the tunnel constructions. The results of the analyses are compared with the reported case histories of tunnel constructions worldwide on soft soils and with the empirical methods proposed by Mair et al. and FHWA to estimate the ground settlement due to the proposed tunnel construction.

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  • Estimation of Settlement and Vibration on the Surface Due to the Construction of East-West Metro Tunnels in Kolkata, India

    Aniruddha Sengupta;Raj Banerjee;Srijit Bandyopadhyay;

    International congress and exhibition on sustainable civil infrastructures

    2017年

  • Three Dimensional Analysis of Diaphragm Walls Supported by Passive Berms

    作者:Muhammad M. El-Sherbiny;Rami M. El-Sherbiny;Hussein H. El-Mamlouk; 会议名称:International congress and exhibition on sustainable civil infrastructures 2017年

    This paper discusses the stability and performance of embedded retaining structures supported by leaving a temporary earth berm on the passive side of the wall in a thick clay deposit characterized by weak soil properties. The objective of this paper is to verify the suitability of using three dimensional finite element software to simulate a bermed excavation. A three-dimensional finite element analysis using PLAXIS 3D software was used to simulate a case history of a monitored retaining wall with a berm in its front side. Analysis and justification of the different parameters used to model the soil and wall is described in this paper. Two different approaches of analysis were applied and compared to account for the stress dependency of soil strength and stiffness. The applicability of the results and adequacy of software were verified by comparing the computed deflections with the monitoring results and a good agreement was realized. Furthermore, the anisotropy of the diaphragm walls was considered to assess its implication on the wall performance during berm removal, as it's deemed to be the most critical stage during construction.

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  • Three Dimensional Analysis of Diaphragm Walls Supported by Passive Berms

    Muhammad M. El-Sherbiny;Rami M. El-Sherbiny;Hussein H. El-Mamlouk;

    International congress and exhibition on sustainable civil infrastructures

    2017年

  • Abu Hamour Tunnel Phase I the First TBM Tunnel in Qatar: The Art of Tunneling in a New World

    作者:J.B. Stypulkowski;F.G. Bemardeau; 会议名称:International congress and exhibition on sustainable civil infrastructures 2017年

    Abu Hamour (Musaimeer) Surface & Ground Water Drainage Tunnel - Phase I (AHSO) is a 9.5 km long, 3.7 m ID storm water tunnel. The writers created comprehensive geotechnical data collection system on the tunneling project in weak/soft rocks which has been successfully implemented. Results of geological mapping have been presented to show how they correlate to TBM performance. The authors make an attempt to correlate common classification systems: Q_w and RMR for rock mass commonly found in Doha, Qatar.

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  • Abu Hamour Tunnel Phase I the First TBM Tunnel in Qatar: The Art of Tunneling in a New World

    J.B. Stypulkowski;F.G. Bemardeau;

    International congress and exhibition on sustainable civil infrastructures

    2017年

  • Reducing the Tunnelling Effect on Adjacent Pile Foundations

    作者:Ahmed N. EL-Attar; 会议名称:International congress and exhibition on sustainable civil infrastructures 2017年

    Tunnel excavation may induce adverse effects on nearby existing structures/foundations in urban areas. Jet grouting is used as solution in the influenced area near or around the tunnel vicinity to reduce the induced stress and deformation of tunnelling process on nearby deep foundation. The objective of the present study is to numerically evaluate the nature of interaction between the employed tunnelling technologies; the nearby structures founded on deep foundation systems and grouted soil using 3D finite element idealization. Back analysis of The stability of El-Attabe Garage building due to the execution of the Greater Cairo Metro Line 3-Phase 1 is conducted in this paper to evaluate the capability of the proposed numerical model. Also, in the present study, a parametric study is conducted using a 3D finite element code to investigate the effect of the different grouting shapes such as jet grouting wall placed at or below tunnel springline, to reduce the tunnelling effect on adjacent pile. In addition, another shape of circular annuals grouting is investigated in this paper. Accordingly, the upper half and full annulus of soil region around the tunnel is grouted before tunneling process to enhance the soil properties and decrease the effect of tunneling. These grouting annuls have a same thickness and length as that of grouting wall used behind the pile. All of these schemes of grouting shapes are used to study their effect on reducing the pile response due to tunnelling process.

    关键字:Cairo Metro Line 3; Finite element; Foundation; Grouting; Piles; Three-dimensional modelling; Tunnelling

  • Reducing the Tunnelling Effect on Adjacent Pile Foundations

    Ahmed N. EL-Attar;

    International congress and exhibition on sustainable civil infrastructures

    2017年

  • Numerical Modeling by Plaxis Software (3D), the Effect of Digging a Tunnel on the Behavior of the Ground and Overlying Structures Case: Subway of Algiers (Algeria)

    作者:Djamel Eddine Boudjellal;Abdellah Hafsaoui;Talhi Korichi; 会议名称:International congress and exhibition on sustainable civil infrastructures 2017年

    Analysis of interactions between underground construction projects and both ground and surface structures is an increasingly strong issue in the geotechnical field, especially in urban areas during an ongoing underground construction project or an excavation project near existing buildings. Tunneling operations at a shallow depth in an urban site (e.g.: Algiers subway) induces, in extreme cases, ground movements that are capable of causing deformations and considerable damages to the nearby above ground structures. This work addresses the effect of the sequential excavation tunnel in by the Austrian method (NATM) at a shallow depth in an urban area, through a numerical model using Plaxis software (3D). The results of this model will be compared to those obtained by an In-Situ measurement comparing, in order to validate the numerical model and to make it easier to predict land deformations in an excavation zone. Tunneling by the Austrian method (NATM) at a shallow depth in an urban area, through a numerical model using Plaxis software (3D). The results of this model will be compared to those obtained by an In-Situ measurement comparing, in order to validate the numerical model and to make it easier to predict land deformations in an excavation zone.

    关键字:Tunnel; Subway; NATM; Plaxis 3D; Sequential excavation

  • Numerical Modeling by Plaxis Software (3D), the Effect of Digging a Tunnel on the Behavior of the Ground and Overlying Structures Case: Subway of Algiers (Algeria)

    Djamel Eddine Boudjellal;Abdellah Hafsaoui;Talhi Korichi;

    International congress and exhibition on sustainable civil infrastructures

    2017年

  • The Monitoring of Segments Dislocation Deformation in Shield Tunnel Based on BOFDA

    作者:Shi Bin;Wang Xing; 会议名称:International congress and exhibition on sustainable civil infrastructures 2017年

    Shield tunnel is widely used in underground traffic engineering and underground pipeline structure, and the structure health monitoring is an important project to ensure the long-term health and safety of tunnels. Regarding to the deformation characteristics of shield tunnel, this paper presents a new method for the layout of sensing fiber based on BOFDA. By analyzing the plane geometry, the relationship between strain and deformation of segment dislocation was determined. The test accuracy and sensitivity of this method depends on fixed point distance. Laboratory test was conducted and the calculated results with this method had good consistency with the results by conventional dial meters. Using this long distance, high-density, high-accuracy and lost-cost health monitoring method, the safety of shield tunnel can be gready ensured.

    关键字:Shield tunnel; Segment dislocation; BOFDA; Optical fiber sensing technology; Health monitoring

  • The Monitoring of Segments Dislocation Deformation in Shield Tunnel Based on BOFDA

    Shi Bin;Wang Xing;

    International congress and exhibition on sustainable civil infrastructures

    2017年

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