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我国的西部高速公路建设中存在广泛的黄土区,黄土边坡一旦发生失稳破坏,就会对生活和生产会产生严重的后果,而降雨是引发边坡失稳的重要因素。由于黄土属于非饱和土,本文在剖析非饱和土力学理论的基础上,利用非饱和土边坡的降雨入渗,水分运移理论,得出了渗流方向与坡面斜交时安全系数的计算公式,并且分析了降雨强度、降雨量对边坡稳定性的影响。研究表明:土中入渗过程或含水量的改变造成土的强度或有效应力发生改变。当斜坡的应力状态达到了其极限强度时,斜坡土体发生破坏,就可能导致滑坡。
There are a wide range of loess areas in the construction of western expressway in our country. Once the loess slope instability is damaged, it will have serious consequences on life and production. Rainfall is an important factor that causes slope instability. Because loess belongs to unsaturated soil, based on the analysis of unsaturated soil mechanics theory, using the theory of rainfall infiltration and moisture transport of unsaturated soil slope, the calculation of safety factor for seepage direction and slope skew Formula, and analyzes the influence of rainfall intensity and rainfall on slope stability. The results show that the change of soil infiltration process or water content causes soil strength or effective stress to change. When the slope’s stress state reaches its ultimate strength, the failure of the slope soil may lead to landslide.