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针对尾矿砂的静力液化特性,在临界状态土力学框架内建立尾矿砂的弹塑性本构模型,并通过自定义本构嵌入到FLAC程序中模拟尾矿砂的静力液化问题。三轴不排水试验模拟结果显示,尾砂静力液化本构模型能够反映尾砂静力液化的一般力学特性,与砂–粉混合物的试验结果吻合较好。选取一个具有代表性的尾矿库(坝)静力液化实例对尾矿库(坝)的静力液化问题进行数值模拟,模拟结果表明,在快速堆载条件下,尾矿库内孔隙水压力不断升高,在尾矿库局部区域产生静力液化,严重的会发生流滑破坏。该模型和采用的数值方法可以用于尾矿库的静力液化稳定性分析。
According to the static liquefaction characteristics of tailing sand, elastic-plastic constitutive model of tailings sand is established within the framework of soil mechanics in the critical state, and the static liquefaction problem of tailing sand is simulated by self-defined constitutive embedded FLAC program. The results of three-axis undrained test show that the static liquefaction constitutive model of tailings can reflect the general mechanical properties of the tail-liquefaction liquefaction, which is in good agreement with the test results of the sand-powder mixture. A representative example of static liquefaction of tailings dam (dam) is selected to simulate the static liquefaction problem of tailings dam (dam). The simulation results show that the pore water pressure in tailings reservoir under rapid loading conditions Increasingly, in the tailings ponds produce static liquefaction in some areas, serious slippery flow will occur. The model and the numerical method can be used to analyze the stability of tailings liquefaction.