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3D effects of turning corner on stability of geosynthetic-reinforced soil structures

机译：转弯对土工加筋土结构稳定性的3D影响

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摘要

Current design procedures of Geosynthetic-Reinforced Soil Structures (GRSS's) are for walls/slopes with long straight alignments. When two GRSS segments intersect, an abrupt change in the alignment forms a turning corner. Experience indicate potential instability problems occurring at corners. The purpose of this study is to explore the effects of turning corner on the stability of reinforced slopes. Three-dimensional (3D) slope stability analysis, based on limit equilibrium, resulted in the maximum tensile force of reinforcement. Parametric studies required numerous computations considering various geometrical parameters and material properties. The computed results produced efficient practical format of stability charts. For long-term stability of reinforced slopes with turning corner, the influences of pore water pressure and seismic loading are also considered. Turning corner can improve the stability of reinforced slopes by virtue of inclusion of end effects. However, localized increase of pore water pressure or directional seismic amplification may decrease locally thus stability requiring strength of reinforcement larger than in two-dimensional (2D) plane-strain. While using 2D analysis for non-localized conditions may require stronger reinforcement, it also requires shorter reinforcement than in 3D analysis; i.e., 2D analysis may be unconservative in terms of reinforcement length.
机译：当前的土工合成材料加筋土壤结构（GRSS's）设计程序适用于长直线对齐的墙/斜坡。当两个GRSS段相交时，路线的突然变化形成转弯。经验表明，在拐角处可能发生潜在的不稳定问题。这项研究的目的是探讨转弯对加筋边坡稳定性的影响。基于极限平衡的三维（3D）边坡稳定性分析得出了钢筋的最大拉力。参数研究需要考虑各种几何参数和材料特性的大量计算。计算结果产生了稳定性图表的有效实用格式。对于具有拐角的加筋斜坡的长期稳定性，还考虑了孔隙水压力和地震荷载的影响。转弯可以通过包括末端效应来改善加筋斜坡的稳定性。但是，孔隙水压力的局部增加或定向地震放大可能会局部降低，因此稳定性要求的增强强度要大于二维（2D）平面应变。虽然对非局部条件使用2D分析可能需要更强的加固，但与3D分析相比，它还需要更短的加固；也就是说，就钢筋长度而言，二维分析可能并不保守。

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  • 来源
    《Geotextiles and Geomembranes》 |2018年第4期|367-376|共10页
  • 作者

    Zhang Fei; Gao Yufeng; Leshchinsky Dov; Yang Shangchuan; Dai Guangyu;

  • 作者单位

    Hohai Univ, Minist Educ Geomech & Embankment Engn, Key Lab, Nanjing 210098, Jiangsu, Peoples R China;

    Hohai Univ, Minist Educ Geomech & Embankment Engn, Key Lab, Nanjing 210098, Jiangsu, Peoples R China;

    Univ Delaware, Dept Civil & Environm Engn, Newark, DE 19716 USA;

    Southwest Jiaotong Univ, Sch Civil Engn, Dept Geotech Engn, Chengdu 610031, Sichuan, Peoples R China;

    Hohai Univ, Minist Educ Geomech & Embankment Engn, Key Lab, Nanjing 210098, Jiangsu, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Geosynthetics; Reinforced soil; Corner; Slope stability; Three dimension; Limit equilibrium;

    机译：土工合成材料;加筋土;角;边坡稳定性;三维;极限平衡;

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