尖山磷矿汤家箐排土场稳定性分析

Stability Analysis of Tangjiaqing Dump in Jianshan Phosphate Mine

露天矿山排土场结构往往较为松散,且地基地形陡峻,在降雨、地震等因素诱发下,易形成滑坡、泥石流灾害。为了分析尖山磷矿汤家箐排土场边坡稳定性,本文通过极限平衡法中的简化毕肖普法对排土场中的边坡圆弧滑动面进行系统分析与评价,分别按照正常运行、暴雨工况和地震运行工况计算出安全系数,从而分析排土场边坡稳定性状况。计算结果表明:汤家箐排土场正常运行、暴雨工况、地震运行工况的安全系数分别为1.365、1.273、1.178,满足规范要求。为防范泥石流等危害,需要加强对排水系统的检查与维护,并且应加强后续作业管理过程中对边坡变形数值的观测。

The structure of the waste dump in open-pit mines is often relatively loose,and the terrain of the foundation is steep.Under the induction of rainfall,earthquakes,and other factors,it is easy to form landslides and mudslides.In order to analyze the slope stability of Tangjiaqing waste dump of Jianshan Phosphate Mine,this paper systematically analyzes and evaluates the circular slip surface of the slope in the waste dump through the simplified Bishop method in the limit equilibrium method,calculates the safety factor according to the normal operation,rainstorm operation and earthquake operation conditions,and then analyzes the slope stability of the waste dump.The calculation results show that the safety factors of Tangjiaqing waste dump under normal operation,rainstorm operation and earthquake operation are 1.365,1.273 and 1.178,respectively,which meet the specification requirements.To prevent hazards such as mudslides,it is necessary to strengthen the inspection and maintenance of the drainage system,and to strengthen the observation of slope deformation values in the subsequent operation management process.