尾矿库动力响应分析中的边界效应

散射问题中外行波远域能量逸散效应是影响尾矿库坝体动力响应的重要因素。基于ABAQUS二次开发，实现了尾矿砂材料等效线性粘性本构，并且将粘弹性人工边界应用于某平地型尾矿库的动力反应，计算了地震作用下该尾矿坝水平向加速度、水平向位移、大动主应力、动剪应力和整体应变能随时间变化的规律。并与固定边界下尾矿库动力响应进行比较。结果表明：边界类型对地震作用下尾矿库动力响应计算结果有较大的影响，相对固定边界，考虑粘弹性人工边界时，尾矿库坝体动力响应最大值减小了15%～25%，表明地震过程中粘弹性人工边界起到了吸收能量的作用，建议在尾矿库动力反应分析中，应考虑粘弹性人工边界对尾矿库动力响应的影响。

Boundary Effect in Dynamic Response Analysis of Tailings Dam

Energy dissipation effect of seismic wave in far field is an important factor in seismic response of tailings dam. Based on the secondary development of ABAQUS, equivalent linear viscous constitutive of tailings sand is realized. The viscoelastic artificial boundary is applied in dynamic response analysis of a flat ground type tailings dam. On that basis, the dynamic response of the horizontal acceleration, the horizontal displacement, the dynamic principal stress, the dynamic shear stress and the strain energy is analyzed. The results of viscoelastic artificial boundary are compared with those of the fixed boundary conditions, which shows boundary types have great influence on the dynamic response of tailings dam. Compared with the fixed boundary, if using the viscoelastic artificial boundary, the maximum values of dynamic response analysis of tailings dam reduces 15%~25% because of the energy absorption effect of the viscoelastic artificial boundary. Therefore, the viscoelastic artificial boundary effect should be considered in the dynamic response analysis of tailings dam.