Importance of Side Resistance in a 3D Stability Analysis

K. Akhtar, T. Stark
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引用次数: 4

Abstract

Present 3D limit equilibrium (LE) methods do not incorporate shear resistance from near vertical sides parallel to the direction of slide movement. Consequently, the computed 3D factor of safety (FS) is underestimated and the shear strength parameters from an inverse analysis are overestimated. The present study uses continuum mechanics to calculate the magnitude of side shear resistance along near vertical sides of a translational slide mass. Results of the parametric study show use of an earth pressure coefficient (Kτ) that is in-between at-rest (K0) and active (KA) earth pressure and Mohr-Colombo strength criteria provides a reasonable estimate of the side shear resistance and 3D/2D FS ratios that are in agreement with finite element (FE) and finite difference (FD) a continuum analyses. Based on these findings, charts showing the influence of shear resistance on 3D/2D FS ratios for various slope inclinations and geometries are presented herein.
侧阻在三维稳定性分析中的重要性
目前的三维极限平衡(LE)方法不考虑与滑动运动方向平行的近垂直侧的剪切阻力。因此,计算的三维安全系数(FS)被低估,而反分析的抗剪强度参数被高估。本研究采用连续介质力学计算平移滑动体近垂直侧的侧剪阻力大小。参数化研究的结果表明,使用介于静止土压力(K0)和活动土压力(KA)之间的土压力系数(Kτ)和Mohr-Colombo强度准则,可以合理估计侧抗剪能力和3D/2D FS比,这与有限元(FE)和有限差分(FD)连续分析一致。基于这些发现,本文给出了各种坡度和几何形状下剪切阻力对3D/2D FS比的影响图表。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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