非饱和渗流作用的九环线K236+500段滑坡成因分析

Cause Analysis of the Landslide at the K236 + 500M Site of Jiu- Huan Line under the Unsaturated Seepage Effect

边坡常因降雨渗流作用而失稳,传统的边坡稳定性计算常因没有考虑到非饱和土体渗流作用对边坡造成的影响而不能全面如实反映滑坡诱因。基于非饱和土的渗流和抗剪强度理论,考虑基质吸力对非饱和土抗剪强度的影响,运用有限元数值模拟方法对九环线K236+500段滑坡体进行了考虑非饱和渗流影响与不考虑非饱和渗流影响的稳定性对比分析,明确了降雨入渗引起的非饱和渗流作用是导致该滑坡的主要诱因。

Slope always loses stability due to the rainwater seepage, but the traditional slope stability cal- culation, which does not take into account the impact of unsaturated seepage effect, cannot clearly and fully reflect all the reasons of the landslide. Based on the unsaturated soil shear strength theory, calculat- ing the influence of the matric suction and using the numerical simulation method, a comparative analysis of the slope stability at the Jiu -Huan line K236 + 500M site was conducted under the conditions of con- sidering unsaturated seepage and no unsaturated seepage. The results show that the unsaturated seepage is one of the main inducements of the landslide at the K236 + 500M site of Jiu - Huan line.