裂隙位置及深度对膨胀土边坡稳定性影响分析

降雨入渗引发裂隙性膨胀土边坡失稳是一种常见的工程地质灾害。在有限元方法中考虑裂隙的存在及降雨过程中裂隙的愈合对膨胀土渗流特性和强度特性的影响，研究了裂隙位置及深度对膨胀土边坡渗流及稳定性的影响。结果表明:裂隙的存在对边坡的渗流及稳定性均有显著的影响。入渗的雨水将集中在裂隙周边的风化土层内，裂隙发育深度决定了潜在滑移面的位置，一旦边坡失稳多呈现浅层滑坡的特点。裂隙位于上坡面和下坡面的稳定性均低于裂隙位于坡顶时的稳定性；随着裂隙深度的增加，边坡稳定性逐渐下降，但下降趋势减缓。

Analysis on Influence of Location and Depth of Fracture on Stability of Expansive Soil Slope

The fractured expansive soil slope instability incurred by the rainfall infiltration is a common engineering geological disaster. The influence of the fracture location and depth to the expansive soil slope seepage and stability is analyzed using the finite element software considering the influence of fracture and fracture healing process during rainfall to the permeability and strength characteristics of expansive soil. The results show that the fracture has a distinct influence on the seepage and stability of the slope. The rain water concentrates on the weathered layer around the fracture, the fracture development depth decides the location of potential slip surface, and it mostly presents shallow landslide once the slope instability occurred. The stability when the main fracture is located in the up and down of the slope surface is lower than it is located in the top of the slope; the stability decreased with the increase of fracture depth, but the decreasing tendency is slow down.