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A numerical study of the influence of mechanical properties of discontinuities in the behavior of tunnels: a case study in the southeastern region of Rio de Janeiro, Brazil.

机译：不连续性机械性能对隧道行为影响的数值研究 - 以巴西里约热内卢东南地区为例。

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This paper presents analysis of the mechanical behavior of a tunnel, specifically assessing the degradation of gneiss rock mass excavated over time, in the southeastern region of the state of Rio de Janeiro in Brazil. The underground excavation has a depth of 300m in a rock mass containing three families of discontinuities, the intact rock showing degrees of alteration of its minerals. Scenarios for analyses are evaluated in conditions of very persistent and moderately persistent discontinuities with the purpose of observing their influence on the stability of the tunnel. Three scenarios of in-situ stress conditions are considered. Excavations with and without support elements were also considered. The supports were shotcrete with steel fibers, reinforcement cables and a mixture of the two. Two-dimensional numerical analyses of the stability of the excavation were carried out using the Discrete Element Method (DEM) through the software UDEC (Itasca, 2011). Failure mechanisms were observed plotting maximum shear displacement values in discontinuities. Sensitivity analyses were carried out in order to determine most sensitive parameters in relation to failure conditions.

机译：本文介绍了隧道力学行为的分析，特别是在巴西里约热内卢州东南地区挖掘出挖掘出来的环岩大量的降解。地下挖掘在包含三个不连续性家庭的岩石群体中具有300米的深度，完整的岩石显示出矿物质的变化程度。分析的情景在非常持久和中等持续的不连续性的条件下评估，目的是观察它们对隧道稳定性的影响。考虑了原位应力条件的三种情况。还考虑了具有和不带支持元素的挖掘。支撑件用钢纤维，加强电缆和两者的混合物排除。通过通过软件UDEC（ITASCA，2011），使用离散元素方法（DEM）进行挖掘稳定性的二维数值分析。观察失败机制在不连续性中绘制最大剪切位移值。进行敏感性分析，以确定与故障状况有关的最敏感的参数。

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《US Rock Mechanics/Geomechanics Symposium》|2017年|1483-2222 p. :|共18页
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Belleza V.C.; Vargas E.A.; Palmeiro do Amaral C.;
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原文格式 PDF
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中图分类 TU45-532;
关键词
DEM; UDEC; numerical study;

机译：DEM;DEC;数字研究;

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4. A numerical study of the influence of mechanical properties of discontinuities in the behavior of tunnels: a case study in the southeastern region of Rio de Janeiro, Brazil. [C] . Belleza V.C., Vargas E.A., Palmeiro do Amaral C. US Rock Mechanics/Geomechanics Symposium . 2017

机译：不连续性机械性能对隧道行为影响的数值研究 - 以巴西里约热内卢东南地区为例。
5. The effects of urbanization on the food web of a mid-order stream in Rio de Janeiro, Brazil. [D] . Detweiler, Angela Maciel. 2005

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6. Electrophoretic study of the genome of human rotaviruses from Rio de Janeiro SÃ£o Paulo and ParÃ¡ Brazil. [O] . H. G. Pereira, R. S. Azeredo, J. P. Leite, 1983

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机译：研究了高温暴露后各种混凝土高温曝光机械性能各种混凝土的机械性能。考虑到高层建筑中垂直元件的抗压强度要求，测试了35,80,100和150MPa各种设计强度的混凝土试样。特别是，在这项研究中，掺入钢纤维对耐火性的影响。实验结果表明，耐火性取决于设计强度和钢纤维含量。在暴露于100-400°C的温度时，80-100MPa的设计强度为35MPa或高性能混凝土（HPC）的正常强度混凝土（NSC）不会击落。然而，当HPC含有1体积的钢纤维的百分比时，爆炸性剥落发生在300℃。超高性能混凝土（UHPC）的设计强度为150 MPa和1.5 Vol。钢纤维的百分比也显示出300℃的剧烈剥落。本研究中发现的实验结果可以有助于更好地了解在火灾中的HPC和UHPC的行为以及钢纤维对耐火性的作用。

A numerical study of the influence of mechanical properties of discontinuities in the behavior of tunnels: a case study in the southeastern region of Rio de Janeiro, Brazil.

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