露天矿岩石边坡孔隙水压及热应力数值分析

结合可可托海露天矿岩石边坡中存在三组构造断裂的实际情况, 用二维离散元udec程序研究了边坡在自重及地下水作用下的受力状态, 构造断裂带中的孔隙水压大小及分布, 同时针对该矿处于亚寒带大陆性气候地区年温差高达80 ℃, 冬季温度最低为-58 ℃的情况, 采用ANSYS有限元软件研究了边坡围岩热应力大小及分布。研究结果表明, 边坡中部的断层裂隙中的孔隙水压力最大; 对于年温差大的可可托海露天矿, 热应力是影响边坡稳定性的一个最主要的因素。

Numerical Analysis for Porous Pressure of Underground Water and Thermal Stress of Rock Slope in Open Pit Mine

In combination with occurrence of three group of structural faults in the rock slopes in Keketuohai open pit, stress state of slope under weight and the influence of underground water, porous pressure size and distribution in the structure of fracture zone were studied with the 2-dimensional discrete element udec code. In view of the Second Frigid Zone continental climate in this mine deposit, where annual temperature difference will be up to 80 ℃, with the lowest temperature of -58 ℃ in winter, the size and distributions of thermal stress of slope surrounding rock was investigated with finite element software ANSYS. Results show that there is a highest porous pressure in the fault crevice in the middle part of slope, and thermal stress is a main factor to influence the slope stability due to the great annual temperature difference in Keketuohai open pit mine.