降雨持续时间对某加高扩容尾矿坝渗流稳定性影响分析

持续降雨对尾矿坝渗流稳定性存在一定影响.以某加高扩容尾矿坝为研究对象,考虑降雨总量或降雨强度一定的情况,基于饱和-非饱和渗流理论对尾矿坝开展随降雨历时变化的渗流分析,得到了坝坡表层和坝体纵深的孔隙水压力变化规律,在渗流分析基础之上采用极限平衡法对尾矿坝开展坝坡稳定性分析.计算结果表明,随着降雨时间的推移,坝坡表层孔隙水...

Analysis of the influence of rainfall duration on the seepage stability of a certain heightening and expanding tailing dam

Continuous rainfall has a certain impact on the seepage stability of the tailings dam. Taking a certain heightening and expanding tailings dam as the research object, considering the total amount of rainfall or rainfall intensity, based on the saturated-unsaturated seepage theory, the seepage analysis of the tailings dam varied with the rainfall duration. The pore water pressure change law of the dam slope surface and the depth of the dam body were obtained, and the limit equilibrium method was used to carry out the stability analysis of the tailings dam on the basis of the seepage analysis. The calculation results showed that the surface pore water pressure of the dam slope was positively correlated with the passage of rainfall,the pore water pressure at the lower elevation of the dam body was almost unchanged, and the safety factor of the tailings dam was negatively correlated with it. In the case of a certain amount of rainfall, when the rainfall time was long and the rainfall intensity is small, the change rate of surface pore water pressure was small, but the stability of the tailings dam was poor when the rain stop. Under the same rainfall intensity, with the passage of rainfall, the safety factor of tailings dam was negatively correlated with rainfall.