快速拟动力法及其在西藏某尾矿坝地震稳定性评价中的应用  

Fast Pseudo-Dynamic Method and its Application in Seismic Stability Evaluation of Tailings Dam in Xizang

作　　者：徐亮 李亮[1] 文嘉辉 李春立 于广明[1] XU Liang;LI Liang;WEN Jiahui;LI Chunli;YU Guangming(School of Civil Engineering,Qingdao University of Technology,Qingdao,Shandong 266520,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛市266520

出　　处：《矿业研究与开发》2025年第3期74-82,共9页Mining Research and Development

基　　金：国家自然科学基金项目(52171264);山东省自然科学基金项目(ZR2023ME007)。

摘　　要：地震是导致尾矿坝动力失稳的主要原因之一。基于拟动力法结合瑞典圆弧法可以快速确定尾矿坝动力稳定性的评价指标。为提高拟动力法在边坡地震稳定性评价中的计算效率,特引入了分离式危险初始相位搜索策略,提出了快速拟动力法。分别应用传统拟静力法、考虑放大系数的拟静力法以及快速拟动力法,从安全系数与失效概率两个角度对西藏某尾矿坝进行地震稳定性评价。数值分析结果表明:3种方法所得到的尾矿坝安全系数均满足稳定性要求的最小值。从安全系数与滑动面积综合来看,由考虑放大系数的拟静力法所得到的结果偏于保守。纵波波速对计算结果影响较小,随着横波波速的增加,由快速拟动力法所得到的安全系数逐步降低,失效概率逐渐增大,失稳滑动面个数逐渐增多,尾矿坝地震失稳的风险源增多。研究成果对尾矿坝地震稳定性评价具有指导意义。Earthquakes are one of the main causes leading to dynamic instability of tailings dams.Based on the pseudo-dynamic method combined with the Swedish arc method,the evaluation indexes of dynamic stability of tailings dams can be quickly determined.To improve the computational efficiency of the pseudo-dynamic method in the evaluation of slope earthquake stability,a separated critical initial phase search strategy was introduced,and a fast pseudo-dynamic method was proposed.The traditional pseudo-static method,the pseudo-static method considering the amplification factor,and the fast pseudo-dynamic method were applied respectively to evaluate the seismic stability of a tailings dam in Xizang from two angles of safety factor and failure probability.The results of numerical analysis show that the safety factors obtained by above three methods all meet the minimum stability requirements.In the view of the safety factor and the sliding area comprehensively,the results obtained by the pseudo-static method considering the amplification factor tend to be conservative.The influence of P-wave velocity on the calculation results is small.With the increase of S-wave velocity,the safety factor obtained by the fast pseudo-dynamic method gradually decreases,the failure probability gradually increases,the number of instability sliding surfaces gradually increases,and the risk sources of earthquake instability of tailings dams increase.The research results have a guiding significance for the evaluation of earthquake stability of tailings dams.

关 键 词：尾矿坝 拟动力法 边坡地震稳定性 安全系数 失效概率 

分 类 号：TD223[矿业工程—矿井建设] TV641.1[水利工程—水利水电工程]