高地震烈度带倾斜基底排土场稳定性分析

Stability Analysis of Dump with Inclined Base in High Seismic Intensity Zone

针对青海大头羊煤矿二矿改扩建过程中外排土场选址及建设问题,根据排土场物料的物理力学参数值建模,分别采用BISHOP法和Morgenstern-Price法对天然工况和考虑地震条件下的倾斜基底排土场稳定性进行计算和分析。结果表明,考虑地震荷载影响时,排土场安全系数小于1.20,处于不稳定状态。为防止滑坡出现,对台阶高度进行优化调整,并提出破底板、疏干排水等预防措施,保障排土场整体稳定性。

Aiming at the problem of dump site selection and construction in the reconstruction and expansion process of No.2 Mine of Datouyang Coal Mine in Qinghai Province,according to the geotechnical physical and mechanical index value modeling,the slope stability of dump under natural and earthquake conditions is calculated and analyzed by using BISHOP method and Morgenstern price method respectively.The results show that the dump safety factor is less than 1.20 under the action of earthquake load,which is in unstable state.In order to prevent landslides,the bench height is optimized and adjusted,and the preventive measures,such as breaking the floor and draining,are proposed to ensure the overall stability of the dump.