基于液化流动模型的尾矿坝地震响应分析

Analysis of tailings dam earthquake responses based on liquefaction flow model

针对传统等效线性法对尾矿坝地震响应分析结果与实际情况存在一定的出入的问题,通过振动台模型试验和数值计算结果比对验证数值计算方法的可行性,运用考虑液化后尾矿砂流动特性的孔压上升模型,基于完全非线性动力分析方法,对尾矿坝地震响应进行分析计算,通过对坝顶位移和加速度的监测结果进行分析,得出坝顶的加速度放大系数以及坝顶位移最大值;并由坝体水平方向位移云图、竖直方向位移云图及位移矢量图,判断可能发生局部滑坡的位置;对坝体内液化情况进行判定,得到尾矿坝的地震响应规律,为尾矿坝抗震设计提供一定的理论参考。

According to certain discrepancies existing between actual situations and tailings dam seismic response analysis results from the traditional equivalent linear method,examining the feasibility of the numerical methods by the conparison between shaking table model test results and numerical results,based on the fully nonlinear dynamic analysis method,and using the pore pressure rise model and considering the liquefied mine tailings flow characteristics,we analyse and calculate the tailings dam seismic responses.Through crest displacement and acceleration monitoring results,we obtain the acceleration amplification factors and the maximum displacement on the crest.By the dam displacement contours in horizontal and vertical direction and the displacement vector,we determine the location of the local landslide and all the liquefaction of the dam.The tailings dam seismic response law will be found,which will provide certain theoretical references for the tailings dam seismic design.