露天煤矿粉质黏土边坡失稳机理与防治

Study on instability mechanism and prevention of silty clay slope in open-pit coal mine

山西某露天煤矿自建设初期,其首采区就连续发生大规模塌方,成为困扰矿山工程技术人员的一大技术难题。利用MIDAS/GTS有限元软件建立边坡模型,开展了不同强度弱化阶段情况下边坡稳定性的数值模拟。通过对塑性区分布和位移云图等数据进行分析,判断粉质黏土边坡强度弱化不同阶段的失稳形式及规模大小。在此基础上,通过对喷混凝土支护方案进行校核及比较,确定影响边坡变形破坏的关键区域。最终提出边坡“削坡+护坡”的滑坡综合治理方案,取得了良好的边坡治理效果。

Since the initial construction of an open-pit coal mine in Shanxi Province,large-scale collapses have occurred continuously in its first mining area,which once became a major technical problem plaguing mine engineers and technicians.The slope model was established by MIDAS/GTS finite element software,and the numerical simulation of slope stability under different strength weakening stages was carried out.Based on the analysis of the data of plastic zone distribution and displacement diagram,the instability forms and scales of silty clay slope at different stages of strength weakening are obtained.On this basis,by checking and comparing shotcrete supporting schemes,the key areas affecting slope deformation and failure are found out.Finally,a comprehensive landslide treatment plan of"slope cutting+slope protection"is proposed,achieving good slope treatment results.