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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。
Slope excavation caused the local damage of shallow part of jointed rock slope. Based on the method of limit equilibrium and strength reduction, the stability of bedding rock slope is studied. The influence of rock slope inclination, damage length and degree on slope safety factor and failure process are systematically analyzed. The results show that the slope safety factor is closely related to the joint inclination, and the slope safety coefficient first decreases with the increase of joint inclination and then increases with the dominant joint inclination of 35 ° ~ 45 °. With the increase of joint damage length, The safety factor of slope decreases linearly; the shear stress concentration is more likely to occur on the top of rock slope with joint damage, so that the instability of slope is accelerated; the failure mode of jointed rock slope is sliding downward along the joint surface; The influence of slope stability is more obvious. The longer the joint damage, the more the safety factor decreases with the increase of injury degree.