尾砂流滑冲击效应数值分析

Numerical analysis of tailings flow impact effect

为研究溃决尾砂的流滑运移特征及对下游构筑物的冲击效应,基于光滑粒子流体动力学(SPH)算法,进行数值计算,并与室内模型试验数据对比。结果表明,尾砂流滑的冲击过程与山地泥石流的运移特征类似,表现为阵性连续流。尾砂流"龙头"对构筑物的瞬时冲击作用十分显著,易造成下游构筑物冲击破坏。数值计算结果与模型试验测试值吻合度较高,说明SPH算法在求解类似尾砂流滑的土工大变形问题上具有良好的适用性,能够有效模拟溃决尾砂的流滑冲击过程,并评价不同灾害强度下受灾体的抗冲击能力。

In order to study the flow slide transport characteristics of outburst tailings and the impact effect on the downstream structures, a numerical calculationwas carried out based on SPH algorithm, and compared with the indoor model test data. The results show that the impact process of tailings flow slide is similar to mudflow mountain migration characteristics-having intermittent continuous flow characteristics. The instantaneous impact on the construction for tailings flow ＂bibcock＂ is very significant, easy to cause impact failure on downstream structures. The calculated results of SPH are in higher agreement with the model experimental values, which is to indicate SPH algorithm has good applicability to solve geotechnical large deformation problems of similar tailings flow slide. In addition, SPH can be used to effectively simulate the impact process of tailings debris flow, and quantitatively evaluate the anti-impact ability of affected body under different disaster intensities.