软弱夹层赋存特征对边坡稳定性的影响

基于软弱夹层力学性质较差,易导致边坡失稳破坏的工程难题,通过FLAC^3D建立含有软弱夹层的数值计算模型,分析软弱夹层厚度、赋存深度和岩性等对边坡水平位移和安全系数的影响。结果表明:随软弱夹层厚度的增加,水平位移逐渐增大,最大值达到7.44 m,边坡安全系数呈线性减小,最小安全系数为1.13;随软弱夹层赋存深度的增加,坡脚处水平位移逐渐减小,最小值为3.71 m,降幅为23.88%,软弱夹层与坡面相交处水平位移逐渐增大,最大值为6.90m,增幅为35.56%,边坡安全系数从1.36降至1.27,降幅为7.09%;随软弱夹层黏聚力的增加,水平位移逐渐减小,最小值为3.45 m,降幅达53.06%,边坡安全系数由1.15增大至1.27,增幅为10.43%。

Influence of Occurrence Characteristics of Weak Interlayer on Slope Stability

Based on the engineering problem that the mechanical properties of weak interlayer are poor and the slope is easy to destroy,the numerical calculation model with weak interlayer is established by FLAC3D.The influence of thickness,depth and lithology of weak interlayer on the horizontal displacement and safety factor of slope is analyzed.The results show that the increase of the thickness of the weak interlayer,the horizontal displacement increases gradually and reaches 7.44 m,the safety factor of the slope decreases linearly and the minimum safety factor is 1.13.With the increase of the depth of the weak interlayer,the horizontal displacement at the foot of the slope decreases gradually,with the minimum value of 3.71 m and the decrease of23.88%.The horizontal displacement at the intersection of weak interlayer and slope increases gradually,with a maximum value of6.90 m,an increase of 35.56%.The slope safety factor decreases from 1.36 to 1.27 and a decrease of 7.09%.With the increase of cohesion of weak interlayer,the horizontal displacement decreases gradually,with a minimum value of 3.45 m,a decrease of53.06%,and the slope safety factor increases from 1.15 to 1.27,an increase of 10.43%.