沙层基底排土场稳定性分析与工程治理

Stability analysis and engineering treatment of sand base dump

为研究扎哈淖尔露天煤矿北排土场稳定性分析与治理,利用CAD二次开放功能自编极限平衡分析软件,结合实测后缘裂缝与底鼓裂缝实际情况,反算了沙层基底抗剪强度参数,根据参数合理确定工程工程治理措施。结果表明:反算分析的北排土场基底土体的抗剪强度参数为c=0 kPa、φ=5.7°;南边坡滑坡模式为推动式切层-挤出性滑动,边坡处欠稳定阶段;通过压脚工程计算,压脚高度为20 m,压脚宽度为20 m,可有效控制了排土场边坡稳定、安全问题。

In order to study the stability analysis and control of the north dump of Zhahanao’er Open-pit Coal Mine,the article compiles limit equilibrium analysis software by using the CAD secondary opening function,combines with the actual situation of the measured trailing edge cracks and the bottom drum cracks,and inversely calculates the shear resistance strength parameters of the sand bed base.According to the parameters,we reasonably determine the engineering treatment measures.The results show that the shear strength parameters of the base soil in the north dump are c=0 kPa and φ=5.7°from the back calculation analysis.The landslide mode of the south slope is driven cutting-extrusive sliding,and the slope is not stable.Through the engineering calculation of the presser foot,the height of the presser foot is 20 m,and the width of the presser foot is 20 m,which can effectively control the stability and safety of the dump slope.