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首页> 外文期刊>International journal of geomechanics >Coupled Effect of Expanded Polystyrene and Geogrid on Load Reduction for High-Filled Cut-and-Cover Tunnels Using the Discrete-Element Method
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Coupled Effect of Expanded Polystyrene and Geogrid on Load Reduction for High-Filled Cut-and-Cover Tunnels Using the Discrete-Element Method

机译：离散单元法研究膨胀聚苯乙烯和土工格栅对减轻高填方覆盖隧道荷载的影响

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摘要

High-filled cut-and-cover tunnels (HFCCTs) can be used to reclaim usable land due to the unique landforms in western China. The load reduction methods used to reduce the earth pressure on such cut-and-cover tunnels (CCTs) can significantly affect the safety of CCTs. This paper describes a study of three load reduction measures: expanded polystyrene (EPS); a combination of EPS and geogrid; and a combination of EPS, geogrid, and concrete wedges. PFC2D, a computer program based on the discrete-element method (DEM), was employed to analyze and examine the evolution of the load reduction mechanisms. Parametric studies were conducted to investigate six influential factors: the density, thickness, width of the EPS, the location (or level) where the EPS is placed in the structure, the tensile strength of the geogrid, and the number of layers of the geogrid. The analysis results are based on the observed changes in average vertical earth pressure (VEP), relative vertical displacement of the soil, relative vertical deformation of the geogrid, and the contact force among soil particles. This study found that these influential factors have significant effects on the soil arching effect and the tensioned member effect on load reduction mechanisms. In order to optimize the load reduction of the earth pressure on the top of HFCCTs, the optimal values for the influential factors are derived.
机译：由于中国西部地区独特的地貌，高填方的掩埋隧道（HFCCT）可用于开垦可用土地。用于降低此类隐蔽式隧道（CCT）上的土压力的减轻负荷方法会严重影响CCT的安全性。本文介绍了三种减轻负荷的措施的研究：膨胀聚苯乙烯（EPS）;聚苯乙烯（EPS）; EPS和土工格栅的组合;以及EPS，土工格栅和混凝土楔块的组合。 PFC2D是基于离散元素方法（DEM）的计算机程序，用于分析和检查负载减少机制的发展。进行了参数研究以研究六个影响因素：EPS的密度，厚度，宽度，EPS在结构中的放置位置（或水平），土工格栅的抗张强度以及土工格栅的层数。分析结果基于观察到的平均垂直土压力（VEP），土壤的相对垂直位移，土工格栅的相对垂直变形以及土壤颗粒之间的接触力的变化。这项研究发现，这些影响因素对土拱效应和受拉构件对减荷机理的影响显着。为了优化HFCCT顶部土压力的负荷降低，得出了影响因素的最佳值。

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  • 来源
    《International journal of geomechanics》 |2020年第6期|04020052.1-04020052.16|共16页
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  • 作者单位

    Lanzhou Jiaotong Univ Coll Civil Engn Lanzhou 730070 Gansu Peoples R China;

    Univ North Dakota Harold Hamm Sch Geol & Geol Engn 81 Cornell St Stop 8358 Grand Forks ND 58202 USA;

    Lanzhou Jiaotong Univ Natl & Prov Joint Engn Lab Rd & Bridge Disaster P Lanzhou 730070 Gansu Peoples R China;

    Tongji Univ Coll Transportat Engn Dept Urban Rail Transit & Railway Engn Shanghai 201804 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Coupled effect; High-filled cut-and-cover tunnel (HFCCT); Load reduction measures; DEM; EPS; Geogrid;

    机译：耦合效应;高填埋式明挖隧道（HFCCT）;减轻负荷的措施;DEM;每股收益;土工格栅;

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