矿山露天开采中采场边坡稳定性研究——以栾川县南泥湖露天钼矿为例

南泥湖钼矿在开采过程中，原始地貌大部分已被改变，形成了多级台阶。当断层走向和边坡走向一致时，会对台阶边坡的稳定性产生不良影响，引发坍塌；当边坡岩体内不存在不利于边坡稳定的较大的(Ⅰ—Ⅲ级)不连续面(或软弱夹层)时，则岩体内小型节理对整体边坡的稳定性起着决定性控制作用。通过对采场地质环境调查，对边坡岩体不连续面节理裂隙进行统计，对边坡稳定性进行分析，在地震和地下水影响条件下，最小安全系数小于1.15时，边坡不能满足稳定性要求，宜采用削坡减载、截排水、抗滑桩、预应力锚索、锚杆、格构锚固等措施，进行边坡综合整治。

Study on stability of stope slope in open-pit mining:taking Nannihu Molybdenum Mine in Luanchuan County as an example

During the mining process of Nannihu Molybdenum Mine，most of the original landform has been changed，forming multi-level steps.When the strike of the fault is consistent with the strike of the slope，the stability of the step slope will be adversely affected and collapse will be caused.When there is no large (Ⅰ-Ⅲ) discontinuity (or weak interlayer) in the rock body of the slope that is unfavorable to the stability of the slope，the small joints in the rock body play a decisive role in controlling the stability of the overall slope.Through the investigation of the geological environment of the stope，the statistics of the joint fissures of the discontinuous surface of the slope rock mass and the analysis of the stability of the slope are carried out. Under the influence of earthquake and groundwater，when the minimum safety factor is less than 1.15，the slope can not meet the stability requirements，so it is advisable to adopt measures such as slope cutting，load reduction，drainage，anti-slide pile，prestressed anchor cable，anchor rod，lattice anchorage，etc.to comprehensively improve the slope.