地震作用下岩质斜坡破坏机制研究

以地震作用下的非贯通节理岩质斜坡为研究对象,利用大型有限元软件ANSYS建立数值模型。数值模拟结果表明:地震作用下非贯通节理岩质斜坡的稳定系数受结构面的长度、密度、贯通率、展布方向等因素影响;节理面的位移放大效应和变形积累效应明显;岩桥的破坏在地震初期比较剧烈,之后在地震作用下继续发生破坏,在经过地震波波幅较大的波段后,斜坡的变形破坏才稳定下来;地震作用下,岩桥内部应力波动剧烈,拉剪共同作用导致了岩桥的最终破坏;层间节理位移和层间摩擦应力分布很不均匀,不同位置的节理的动力响应也有较大不同。

Failure Mechanism of Rock Slope under Earthquake

Finite element software ANSYS was used to establish a numerical model to research the rock slope contai-ning intermittent joints under earthquake.Numerical simulation results showed that:under earthquake action,the stability coefficient of rock slope with intermittent joints was influenced by the length density,rate of connectivity, spreading directions of structural planes;the displacement amplification effect and deformation accumulation effect of joint surface were obvious.In the early stage of earthquake action,the damage of rock bridges was very violent, and then the damage continued under earthquake.The deformation and failure of slope stabilized until after large amplitude band.Moreover,the internal stress of the rock bridges fluctuated remarkably under earthquake,and the tension action and shearing action together led to the final failure of the non-coalescence regions;the contact sliding distance and frictional stress between layers distributed very unevenly,and the dynamic response of joints at differ-ent positions were quite different.