中文摘要：

针对尾矿坝溃坝对下游人员生命财产和环境安全危害严重，难以准确定量地描述这一问题，以辽宁某尾矿库为例，采用非牛顿流体模型中的Bingham模型，利用ANSYSCFX流体动力学分析软件对溃坝后的砂流演进过程进行模拟分析。重点分析了溃坝后的流态变化、速度矢量变化以及最终堆积形态。分析结果表明：尾矿坝溃坝以后，尾矿砂流在重力作用下向下游演进运动，冲出初期坝坝坡之后形成涌波，并逐渐向下游扩散传播；任意时刻尾砂的速度大小均呈现出渐进式的变化，从尾部至端头速度逐渐增大，近地面速度比表面速度大；最终形成一个尾部厚、向边缘逐渐变薄的堆积体。所得结果将为溃坝灾害应急预案的编制、下游人员安全疏散方案的提出及溃坝后的灾害评估提供重要的依据。

英文摘要：

The tailings dam-break seriously threaten the downstream personnel life and property, and also environmen- tal security. It is difficult to descript the problem accurately and quantitatively. The Bingham model, one of a non-newtonian fluid model, is adopted in this paper. Sand flow evolution process after a tailings dam-break in Liaonihg is transient simula- tion analysis by using fluid dynamics analysis software ANSYS CFX. The flow regime change,velocity vector change and fi- nal accumulation form after dam-break are emphasized. The analysis results show that tail sand flow move to downriver by gravity after the tailings dam-break. A surge wave was formed when rushed out early stage, and spread to the downstream gradually. The tailings velocity of any time presents a gradual change, the tailings velocity increases gradually from the tip to end, and ground speed is faster than surface. Finally an accumulation body is formed, that its tail is thick and thin to the edge. The results will provide important basis to the formation of dam failure disaster emergency plan, the proposition of downstream personnel safety evacuation plan and hazard assessment after dam-break.