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采用强度折减法和简化Bishop法对路堤边坡进行了稳定性分析,分别考虑了车辆荷载、飞机荷载和地震荷载作用的影响。重点研究了边坡坡度、高度、粘聚力、地震烈度、降雨强度对边坡稳定性的影响。研究结果表明:地震荷载作用对边坡稳定影响不显著,路堤高度对自重荷载和地震荷载作用下边坡稳定有一定的影响,但是路堤粘聚力对飞机荷载和地震荷载作用下边坡稳定性明显,同时地震烈度对边坡稳定影响较大,而强降雨也直接威胁边坡安全。因此粉砂土路基设计时必须慎重考虑当地的地震烈度和路堤土的粘聚力大小,综合考虑其坡度和高度的选择。
The strength reduction method and the simplified Bishop method are used to analyze the stability of the embankment slope. The effects of vehicle load, aircraft load and earthquake load are considered respectively. The effects of slope gradient, height, cohesion, seismic intensity and rainfall intensity on slope stability are mainly studied. The results show that the effect of earthquake load on slope stability is insignificant. The height of embankment has a certain influence on the slope stability under self-weight load and earthquake load. However, the embankment cohesion has obvious stability to slope under aircraft load and earthquake load. At the same time, the intensity of the earthquake has a great influence on the slope stability, but strong rainfall also directly threatens the slope safety. Therefore, when designing the silt subgrade, we must carefully consider the local seismic intensity and the cohesion of embankment so as to consider the choice of slope and height.