巨石混合体边坡失稳模式研究

运用离散元数值模拟方法，对具有大块石堆积特征的巨石混合体边坡的失稳模式进行了研究。结果表明，巨石混合体边坡中块石表面摩擦系数的降低会导致块石边坡的运动变形，变形模式以块石的平移为主，个别块石发生转动。；块石在变形过程中重新镶嵌、咬合，具有自稳性。；巨石混合体边坡主要的失稳范围为坡体的前缘和中部，竖直方向上坡体中上部的变形量较大，坡体下部变形量较小。；前部块体的变形会导致后部块体失去支撑而发生变形，属牵引式的失稳模式。 The destabilization mode of the huge rock mixture slope was investigated using the discrete element numerical method. The results showed that (1) the huge rock mixture slope would deform when the friction coefficient of the rock surface reduces. The destabilization mode is mainly the translation slip of rock blocks with rotation of a few rock blocks; (2) the rock blocks accumulate and occlude during the movement, and shows the ability of self-stabilization; (3) the main destabilization range of the huge block mixture slope is the front and the middle parts of the slope. In vertical direction, the upper and middle parts of slope have higher deformation than the lower part; and (4) the movement of front rock block can cause the deformation of back rock block due to losing of support, which is the retrogressive destabilization mode.