大后沟尾矿库稳定性分析

Stability Analysis of Tailings Pond in Dahou Ditch

根据室内静力与动力实验获得尾矿静力和动力岩土力学参数,对大后沟尾矿库进行静力和动力稳定性分析,并采用安全系数、永久变形和液化判别多指标综合评价坝体在动力作用下的稳定性。结果表明,在静力情况下,坝体安全系数为1.28,满足稳定要求;动力作用下,坝体最小平均安全系数为0.94,有失稳风险,永久变形值为3.17cm,为中等程度破坏,应采取相应的加固措施,而液化范围仅为局部小区域,对稳定性影响较小。

Static and dynamic mechanics parameters of tailings pond were obtained by laboratory static and dynamic experiments.Static and dynamic stability analysis of tailings pond was carried out in Dahou Ditch.The stability of dam under dynamic action was evaluated comprehensively with various factors including safety factors,permanent deformation and liquefaction evaluation.The results indicated that the safety factor was 1.28in static action,meeting the requirement of stability.And in dynamic action,the minimum average safety factor was 0.94,with some risk of unstability.The permanent deformation value was 3.17cm,with some risk of moderate damage.Therefore,relevant treatment measures should be taken to reinforce the dam.The liquefaction region was only in small areas and had little influence on the stability of dam.