基于拉剪强度同等折减法的滑坡稳定性分析

Landslide Stability Analysis Based on Equal Reduction Method of Tensile and Shear Strength

摘要:

以攀枝花教师街滑坡为背景，考虑土体抗拉强度的影响，结合抗剪强度，采用“拉剪强度同等折减法”来研究滑坡的稳定性。通过室内试验，分析了含水率对教师街滑坡不同岩土层的影响规律，发现滑带层土体的内摩擦角和粘聚力受水的作用更加显著。通过利用有限差分软件FLAC和拉剪同等折减法，得到了教师街滑坡的拉剪临界折减系数、临界内摩擦角、临界粘聚力；同时，还发现教师街滑坡对土体的内摩擦角敏感度最高，但是抗拉强度的影响和粘聚力很接近，不容忽视；滑坡坡肩位移大于坡脚位移，应注意坡肩位移的变化。

Abstract:

Based on the background of the landslide of Panzhihua, considering the influence of soil tensile strength, combined with the shear strength and using “equal reduction method of tensile shear strength”, the landslide stability is studied in this paper. Through the indoor experiment, the influence laws of moisture content on the different rock and soil layers of the landslide are analyzed; it is found that the internal friction angle and cohesion of the sliding belt soil are more obvious. By using the finite difference software FLAC and equal reduction method of tensile shear strength, the landslide tensile shear critical reduction coefficient, critical internal friction angle and the critical cohesion of the landslide are obtained; it is also found that the landslide there is most sensitive to the internal friction angle of the soil, but the influence force of the tensile strength and the cohesion are very close, so that it can not be neglected. The slope shoulder displacement is greater than the slope base displacement and the slope shoulder displacement changes should be noticed.