平朔东露天煤矿南帮边坡稳定性评价与治理研究

Research on stability evaluation and treatment for the south slope of Pingshuo East Opencast Coal Mine

平朔东露天煤矿是平朔矿区三大露天矿之一,边坡的稳定性严重影响到东露天矿的生产安全,对开挖边坡进行稳定性分析和提出合理的治理方案意义重大.根据现场勘测资料,研究和分析了东露天矿南帮边坡的工程概况,运用大型有限元软件ABAQUS构建了边坡二维地质模型,采用强度折减法对边坡进行稳定性分析,并选取位移突变时对应的安全系数为判断依据.结果表明:边坡下部岩土层处于稳定状态,上覆粉土层局部区域稳定性较差,最大位移达到22cm,需要进行治理.综合考虑安全性和削坡工作量等因素,建议对粉土层不稳定区域进行削坡处理.运用ABAQUS软件分别对粉土层坡角为30,35,40,45,50°条件下边坡进行稳定性分析,结果表明,粉土层坡角调整为30°最合适.

Pingshuo East Opencast Coal Mine is one of three open-pit mines in Pingshuo. The stability of the slope has influence on production safety of the East Opencast Coal Mine, and it is significant to make a stability analysis and reasonable treatment measures for excavated slope. Based on the site survey data, engineering situation of the south slope of East Open- cut Coal Mine is researched and analyzed. The slope dimensional geological model is con- structed by the use of finite element software ABAQUS and slope stability analysis is under- taken by strength reduction method. Meanwhile, choosing the value where displacement has mutation as safety factor to judge whether it is stable. The result indicates that slope can maintain a good stability, while, poor stability in overlying silt layer exists in some areas with maximum displacement reached 22 cm. Obviously, it needs to be governed. On consid- ering such factors as safety factor and cutting workload, a cutting treatment is proposal. Slope stability is undertaken on the conditions of 30, 35, 40, 45, 50° with software ABAQUS. Results show that it is suitable to adjust slope angle to 30°.