考虑损伤顺层节理岩质边坡稳定性分析

Slope Stability Analysis of Jointed Rock Considering Damage Bedding

边坡开挖造成节理岩质边坡的浅部局部破坏。基于极限平衡法和强度折减法对顺层节理岩质边坡的稳定性进行研究,系统地分析岩质边坡节理倾角、损伤长度和程度对边坡安全系数和破坏过程的影响。结果表明：边坡安全系数与节理倾角密切相关,边坡安全系数随着节理倾角的增加先减小、后增大,优势节理倾角在35°~45°;随着节理损伤长度的增加,边坡安全系数近似线性减小;节理损伤的岩质边坡坡顶更易产生剪应力集中,从而加速边坡失稳,节理岩质边坡破坏模式为沿着节理面向下整体滑动;节理损伤程度对边坡稳定性影响较明显,节理损伤越长,安全系数随损伤程度的增大而加速下降。

The excavation will cause the failure of the shallow part of the rock slope. Limit equilibrium method and strength reduction method are used to research stability of bedding jointed rock slope. We systematically analyze the effect of joint inclination,damage length and degree on safety factor and failure process. Results show that the relationship between joint inclination and safety factor is closely related. The safety factor first decreases then increases with the decrease of joint inclination. The preferred joint inclination range is between 35°and 45°. The safety factor decreases with the increase of the length of damaged joint,and the relationship is approximately linear. It is more easily to result in stress concentration on top of the rock slope with joint damage. To make the slope more prone to instability,the failure mode of the slope is along the joint plane slide. The joint damage degree has a significant effect on the stability of slope. The longer of the length of the joint damage,the more obvious of the influence of joint damage degree on the stability of the slope. The research results could provide reference for the slope excavation.