炭质页岩软弱夹层路堑边坡稳定性分析

Stability analysis of cutting slope with carbonaceous shale weak interlayer

炭质页岩遇水软化易崩解,且强度低,作为夹层其软化特性对边坡稳定性有重要影响。通过室内试验研究了炭质页岩物理力学性质,运用Ansys建模,并将模型导入有限差分软件FLAC 3D,对炭质页岩夹层水软化下的边坡稳定性进行了数值模拟。重点分析了炭质页岩水软化下边坡塑性区分布、边坡最大位移及安全系数变化规律。结果表明:随着炭质页岩剪切面含水量的增大,路堑边坡稳定性随之降低;对于坡比为1∶1的炭质页岩路堑边坡,当炭质页岩剪切面含水量达到10%时,边坡失稳。

Carbonaceous shale has the characteristics such as the strength softening and the disintegration after meeting the water, its softening properties have a major impact on slope stability as interlayer. Physical-mechanical properties of carbonaceous shale is studied in this paper by laboratory test, numerical simulation is done for carbonaceous shale slope stability under the water softening by using Ansys to create model then import finite difference software FLAC 3D. The variation of plastic zone distribution of slope, maximum displacement and safety factor of slope are analyzed under carbonaceous shale water softening. The result shows that： The cutting slope stability decreases with the increase of the water content of carbonaceous shale shear plane; slope is instability when the water content of carbonaceous shale shear plane reaches 10% for carbonaceous shale cutting slope of slope ratio of 1：1.