露天煤矿帮边坡在地震荷载作用下稳定性分析

Stability Analysis of Open Pit Coal Mine Slope under Earthquake Load

大型露天煤矿开采要综合考虑安全和经济,充分考虑地区自然灾害的影响,对边坡稳定性以及煤柱进行优化是研究的重点。采用Midas软件对新疆某大型露天煤矿边坡在地震动作用下有限元强度折减计算,通过比较位移、速度以及折减安全系数和剪切应变综合分析边坡的稳定性。结果表明:露天煤矿大边坡在地震作用下,有明显变形、安全系数整体呈下降的趋势.出现坡面贯通趋势。分析得到:边坡在该地震荷载下处于不稳定状态,边坡体没有出现滑坡的趋势,坡体下方的贯通区表明局部发生剪切破坏,通过对边坡体处于最小安全系数、最大位移时的最大剪切应变确定最大开挖深度。

In large-scale open-pit coal mining,safety and economy should be considered comprehensively,and the influence of regional natural disasters should be fully considered.The key point of research is to optimize the slope stability and coal pillar.In this paper,Midas software is used to calculate the strength reduction of a large-scale open-pit coal mine slope under the action of ground motion.The results show that:under the earthquake action,the large slope of opencast coal mine has the obvious deformation,the safety factor overall presents the downward trend,appears the slope through trend.The analysis obtains:the slope is in the unstable state under the earthquake load,the slope body does not appear the landslide tendency,the through area under the slope body indicates that the local shear failure occurs,through the slope body in the minimum safety factor,the maximum shear strain at maximum displacement determines the maximum excavation depth.