不同扰动作用下尾矿坝稳定性分析

Analysis on Stability of Tailings Dam Under Different Disturbance

以某尾矿坝为研究对象,结合室内物理力学实验得到的参数,采用Slide软件结合Bishop法和瑞典圆弧法对尾矿坝在正常运行、洪水工况和地震作用3种条件下的稳定性进行计算分析,并对加高方案进行数值模拟及稳定性分析。考虑计算安全系数偏小的瑞典圆弧法,结果表明,尾矿坝正常运行时Ⅰ号和Ⅱ号尾矿坝安全系数低于规范要求;洪水工况下尾矿坝整体稳定性降低,Ⅰ号、Ⅱ号和Ⅵ号尾矿坝安全系数低于规范要求;地震作用对尾矿坝影响最大,只有Ⅲ号和Ⅴ号尾矿坝安全系数满足规范要求;尾矿坝加高后安全系数明显减小。由于尾矿坝环境复杂,为了有效防止尾矿坝失稳导致工程事故,需要对尾矿坝采取相应的加固措施并加强监测预警。

Taking a tailing dam as the research object,combining indoor physical mechanics experiment,using Slide software,the Bishop method and the Swedish arc method were used to calculate the stability of tailings dam under normal operation,flood condition and earthquake action.And the numerical simulation and stability analysis of the heightening scheme were carried out.Taking Swedish arc method which result was small into consideration.The results show thatⅠandⅡtailings dam safety coefficient are lower than the standard requirements under normal operation.The overall stability of the tailings dam was reduced under flood condition,Ⅰ and Ⅱ and Ⅵ tailings dam safety coefficient are lower than the standard requirements.The earthquake effect has the greatest impact on the tailings dam,only the safety coefficient of the Ⅲ and Ⅴ tailings dams meet the standard requirements.The safety coefficient decreases when the tailings dam’s heightening.As the tailings dam environment is complex,in order to effectively prevent the tailings dam from destroying and causing engineering accidents,this engineering needs to take measures to reinforce the tailings dam and strengthen monitoring and early warning.