露天矿边坡稳定性与加固监测分析

Research to the stability,reinforcement and monitoring for an open-pit mine slop

根据某露天矿边坡工程实例,运用有限单元法软件MIDAS/GTS对该边坡进行变形稳定性分析.在分析中采用强度折减法,求得安全系数为1.06,边坡处于不稳定状态.采用预应力监测锚索对该边坡进行加固监测.加固后安全系数提高到1.50以上,说明预应力监测锚索对边坡起到了有效的加固作用.同时记录边坡滑动力和位移数据,分析得到滑动力在监测当中逐渐趋于稳定,位移随着时间的推移也慢慢趋于平稳.同时发现位移监测的可靠性难以满足需求,在以后的监测当中采用以滑动力监测为主,位移监测为辅的措施.最后指出预应力监测锚索在边坡的稳定加固和边坡滑动失稳预测方面可靠有效.

Based on an open-pit mine slope engineering example, this paper makes an analysis of slope stability with the help of the finite element method software MIDAS/GTS. By using the strength reduction, it seeks the safety factor of 1.06, and the slope in an unstable state. The slope is reinforced by the prestressed monitoring of anchor cable. The reinforced safety factor increases to above 1.50,and monitoring prestressed anchor cable on the slope plays an effective role in reinforcement. At the same time,record of the sliding force and displacement data,analysis of the sliding force tends to be stable and the displacement slowly stabilized o- ver time. It is also found that the reliability of the displacement monitoring is difficult to meet demand. In the future the sliding force monitoring will play an important role, and the displacement monitoring as a supplement. Finally,the prestressed monitoring of anchor cable performs a reliable and effective function in slope stability reinforcement and instability pre- diction.