浅层坍滑是绝大多数膨胀土路堑边坡在降雨期或雨后常发生的地质灾害,往往造成新建公路的交通中断、沿线生态环境破坏并需投入巨额的修复费用,而其破坏的真正原因目前仍不十分清楚。为此,通过对试验数据的分析,研究干湿循环条件下膨胀土的抗剪强度衰减规律,得到浅、表层边坡土体强度具有非线性性质,并认为该特性是因土固有的膨胀性本质所致;进一步开展干湿循环作用下膨胀土边坡的浅层坍滑分析,发现黏聚力的严重衰减是导致浅层坍滑破坏最重要的原因。因此,进行膨胀土边坡稳定性分析时,只有采用实测土样的非线性强度参数,才能获得与实际较为吻合的分析计算结果。 Shallow collapse is the most geological disasters of the cutting slope of most expansive soils during the rainfall or rain. It often results in the disruption of the traffic of the new roads, the destruction of the ecological environment along the roads and the huge repair costs, and the real damage The reason is still not very clear. Therefore, by analyzing the experimental data, the attenuation law of shear strength of expansive soils under wetting and drying cycles is studied, and the strength of soil in shallow and surface slopes is nonlinear. It is considered that this property is due to the inherent expansibility The result of superficial slump analysis of the expansive soil slope under the action of the wetting-drying cycle shows that the serious decay of cohesion is the most important reason of the superficial collapse and collapse. Therefore, when analyzing the stability of expansive soil slopes, only the nonlinear strength parameters of the measured soil samples can be used to obtain the analytical results that are in good agreement with the actual ones.