某拟建尾矿库坝体动力稳定性数值模拟研究

Numerical Simulation on Dynamic Stability of a Planned Tailings Dam

利用尾矿材料的力学指标,结合二维动力稳定数值计算模型以及El-Centro地震波、Taft地震波和一条人工合成地震波的基岩输入地震时程曲线,对某尾矿库坝体动力稳定性进行了数值模拟分析,结果显示:3个地震波所得结果较为一致,没有明显离散性,说明地震波选取合理;震后尾矿库的残余变形分析表明,坝体震后发生残余变形,尾矿库的最小安全超高、最小干滩长度和坝体抗滑安全系数均满足规范要求,该尾矿库的动力分析结果为坝体设计建设提供了科学依据。

Using the mechanics properties of the tailings,the dynamic stability of a tailings dam was numerically simulated based on the construction of two-dimensional numerical calculation model of dynamic stability,as well as input seismic time-history curves of bedrock under El-Centro seismic wave,Taft seismic wave and an artificial seismic wave.The results showed that the results of three seismic waves were consistent,without obvious discreteness,which proved that the selection of seismic waves was reasonable.The deformation analysis showed that dam residual deformation occurred after the quake,and the minimum free height,the minimum dry beach length and the anti-sliding factor of dam all met the requirements of the design code.The dynamic analysis could provide a scientific basis for the design and construction of tailings dam.