含有结构面岩石边坡抗滑稳定性模拟分析

Simulation for Anti-sliding Stability of Rock Slope with Structure Faces

基于Drucker-Prager屈服准则,采用有限元方法模拟计算了完整和含有结构面岩石边坡的抗滑稳定性问题。研究结果表明,完整岩石边坡的抗滑稳定性主要与岩石的内聚力和内摩擦角有关,在极限状态下,边坡滑弧的形态近似为圆弧,并且滑弧通过边坡的坡脚。当岩层结构面近似平行于边坡,且靠近边坡可能滑弧塑性区时,与完整岩石边坡相对比,会改变原来塑性屈服区的形状,使得边坡的抗滑稳定性安全系数降低。当岩层结构面近似与边坡垂直时,与完整岩石边坡相对比,对原来塑性屈服区的形状和安全系数基本没有影响。

Based on the Drucker-Prager yielding criterion,the anti-sliding stability of rock slopes with structure faces is investigated by means of finite element method.The investigation results show that the anti-sliding stability of rock slopes is mainly affected by the cohesion and inner fraction angle of rock material.In limiting condition,the form of slop slip circle is similar with arc,and the slip circle passes the slop angle.While the structure face in rock slope is parallel to rock slope and near plastic zone,the shape of plastic zone is changed,and the factor of safety of rock slope deceases compared with integrate rock slope.While the structure face in rock slope is vertical to rock slope,the shape of plastic zone is not affected,and the factor of safety of rock slope is unchanged compared with the side slope of the complete rock.