中文摘要：

基于水砂混合物非平衡连续方程和动量方程,考虑尾矿库溃坝过程中溃口及底床变化对溃坝下泄物中尾矿砂体积浓度的影响,建立了一个描述尾矿库漫顶溃坝溃口发展过程和溃口下泄物流量过程的数学模型。应用该数学模型对某尾矿库漫顶溃坝过程进行了模拟,结果表明,尾矿库溃坝过程中下泄物体积浓度变化很大,前期下泄物以水为主,尾矿砂含量较低且以悬移质运动为主;后期下泄物主要以尾矿砂为主,水的含量很低,尾矿砂以推移质运动为主,当下泄物底床剪应力增量小于尾矿砂起动的临界剪应力时,溃坝过程停止。

英文摘要：

Based on the non-equilibrium continuous equation and momentum equation for water-sand mixture, considering the impact on the variation of sand volume concentration due to the change of breach slope and bed, a mathematical model is established to describe the breach development and drainage process of tailings dam. The mathematical model is employed to simulate the breach process of a railings dam. The calculated results show that the volume concentration of tailing sand changes greatly during the drainage process. At the early stage of drainage, the main part of the discharge materials is water, and the distribution of sand is mainly suspended load. At the later stage, the main part of the discharge materials is sand, and the distribution of sand is mainly bed load. The drainage process stops while the bed shear stress increment of discharge materials is less than the critical shear stress of sand.