西冲矿山岩质边坡在地震动力作用下失稳机制模拟研究

Simulation research on the instability model of rock slope in earthquake dynamic condition,Xichong mine

以西冲矿山某一反倾岩质边坡为例,在现场工程地质条件调查的基础上,依据相似原理构建了地震动力作用下边坡失稳物理模拟试验模型。模拟试验水平向峰值加速度为1.025m/s2、竖直向峰值加速度为2.102m/s2、振动持续时间为20s。试验得出,地震力作用下边坡的失稳模式为松动→倾倒→崩塌,边坡的变形部位主要为坡体前缘,竖直向变形量为0.5cm,水平向变形量为0.4cm,边坡前缘出现贯通的破裂面,坡体后缘出现倾倒变形现象。物理模拟结果与UDEC数值模拟分析结果有良好的一致性。

With a counter-tih rock slope in Xichong mine as example, the physical simulation instability model （scale 1： 150） in earthquake dynamic condition is built on the basis of in-situ geological survey. The horizontal peak acceleration is 1. 025 m/s2, the vertical peak acceleration is 2. 102 m/s2 and the vibration lasts 20 s. The instability model of slope in the earthquake dynamic condition is loosening---dumping---collapse. The exterior edge is the main deformation part, whose vertical deformation is 0.5 cm and horizontal one is 0.4 cm. There are connected fracture surfaces in the exterior edge, while collapses appear in the trailing edge. The physical simulation results accord with the UDEC numerical simulation results.