连续降雨下尾矿库失稳溃坝数学模型研究与应用

Research on the Mathematical Model of Tailings Dam Breaching Due to Continuous Rainfall and Its Application

针对连续降雨导致的尾矿库失稳溃决,基于饱和-非饱和渗流理论和水砂混合物非平衡连续方程和动量方程,建立了一个尾矿库边坡失稳溃坝数学模型。该模型可考虑连续降雨条件下尾矿库的渗流场和应力场变化、溃口和底床变化对溃坝下泄物流量过程影响。应用该模型对某尾矿库进行了连续降雨条件下失稳溃坝过程的模拟分析,计算结果表明:连续降雨入渗使尾矿库浸润线不断抬升,进而导致尾矿库边坡发生失稳,失稳后坝体受力条件急剧恶化,在上游荷载作用下发生剪切破坏导致漫顶溃决。

Focused on the tailings dam breaching caused by continuous rainfall,and based on the saturated-unsaturated seepage theory,the non-equilibrium continuous equation and the momentum equation of water-sand mixture a mathematical model is put forward to describe the tailings dam breaching due to slope failure. The model considers the impact on drainage flow process of tailings dam due to the change of seepage and stress field,as well as the variation of breach slope and bed.Meanwhile,the model is applied to simulate the dam breaching process of a tailings dam under continuous rainfall,and the calculated results show that continuous rainfall infiltration makes seepage line of the dam constantly rising,and then leads to dam slope failure; The stress condition of dam body deteriorates rapidly after the collapse of slope,and the shear failure of the remaining wedge may occur under the action of upstream loads,after that the overtopping failure occurs.