不同坡面形态滑坡的稳定性分析

Stability analysis of landslides with different slope forms

为了研究坡面形态对滑坡稳定性的影响,设计3种坡度、2种坡高共6组试验,对不同坡面形态的滑坡进行了物理模拟试验,通过抬升试验模型槽模拟滑坡失稳破坏的过程,记录破坏过程和破坏时的临界破坏角度,分析了不同坡型滑坡的稳定性和破坏情况。试验结果表明,相同坡度、相同坡高的情况下,凸坡所需抬升角度最低,其稳定性最差,凹坡最高,其稳定性最好,且凸坡破坏时更易发生分级启动。从滑坡表面角度和滑体重量进行理论分析,对试验结果进行解释。采用稳定性计算获得不同坡度下不同坡面形态滑坡的稳定性系数,结果为凸坡稳定性系数最低,凹坡稳定性系数最高,计算结果与试验结果相同,由此可得在坡度、坡高、纵曲率均相同的条件下,凸坡稳定性最差,直线型坡次之,凹坡稳定性最好。

In order to study the influence of slope shape on the stability of landslide,6 groups of tests were designed for 3 slopes and 2 slope heights.Physical simulation tests were carried out for landslides with different slope shapes.The process of landslide instability and failure was simulated through the lifting test model slot.The failure process and critical failure angle were recorded,and the stability and failure of landslides with different slope types were analyzed.The test results show that under the same slope and height,the convex slope has the lowest lifting angle,the worst stability,and the concave slope has the highest stability,and it is easier to start grading when the convex slope is damaged.Theoretical analysis is made from the angle of landslide surface and the weight of landslide mass,and the test results are explained.The stability coefficients of landslides with different slope shapes under different slopes are obtained by stability calculation.The results show that the stability coefficients of convex slopes are the lowest and that of concave slopes are the highest.The calculation results are the same as the test results.Therefore,under the conditions of the same slope,slope height and longitudinal curvature,the stability of convex slopes is the worst,followed by linear slopes,and the stability of concave slopes is the best.