软弱带对土质边坡稳定性影响分析

Influence of soft stratum on stability of soil slope

以软弱带土质边坡为研究对象,通过室内土工试验,并基于专业有限元软件,对全应力作用下的软弱带土质边坡稳定性进行研究,分析软弱带对土质边坡受应力作用的影响,及应力应变过程和边坡稳定性的变化规律。结果表明:1)在相同应变条件下,主应力差基本随着软弱夹层厚度增加而逐渐增大,即在相同应力条件下,试件的变形程度随着夹层厚度增加而增加;2)随着软弱夹层厚度增加,试件内摩擦角呈不断减少趋势;3)含软弱夹层土质边坡相比不含软弱夹层边坡具有更小的安全系数,即稳定性更差。且随着软弱夹层厚度的增加,土质边坡安全系数逐渐降低;4)软弱夹层与边坡成一定倾角时,影响程度最大,垂直分布次之,平行分布最小。

Taking soil slope as the research object and based on the indoor geo-technical experiment, we probe into the stability of soil slope in a soft stratuml under the effect of full stress using the finite element software, analyze the influence of soft stratuml on soil slope stress and the change rule of complete stress-strain process and stability of slope.The results show that： 1） under the same strains condition, the principal stress difference increases with the increase of weak interbed＇ s thickness, which means that under the same stress condition, the specimen＇s deformation degree increases with the increase of the intercalated thickness; 2） the internal friction angle of the specimen decreases with the increase of the weak interbed＇ s thickness; 3） the safety factor of the slope with soft stratum is less than that without soft stratum, which means that the stability of this situation is even worse, and the safety factor of soil slope decreasies with the increase of the weak interbed＇ s thickness; 4） when the soft stratum and the slope appears a certain angle, the influence degree is the biggest, that of the vertical distribution is the second, and that of the parallel distribution is the smallest.