基于流固耦合的尾矿库三维失稳形态及稳定性分析  

Three Dimensional Instability Characteristics and Stability Analysis of A Tailing Dam Based on Fluid-Solid Coupling Theory

作　　者：李强[1,2] 张力霆[1,2] 齐清兰[1,2] 

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043

出　　处：《应用基础与工程科学学报》2017年第3期558-567,共10页Journal of Basic Science and Engineering

基　　金：国家自然科学基金项目(50908153);河北省青年拔尖人才基金项目;河北省高校优秀青年基金项目(BJ2014051)

摘　　要：针对尾矿库实例,根据尾矿库几何特征建立了尾矿库的三维数值分析模型,实现了尾矿库基于流固耦合—强度折减的三维稳定性分析,分析了尾矿坝滑移面的形成过程,得出尾矿坝内三维滑移面空间分布:该滑移面在尾矿坝坝面上表现为一个封闭的塑性带,塑性带分布范围与尾矿库地形相关;该滑移面在尾矿坝的纵剖面上表现为近似圆弧的曲线,且其埋深与库区地形相关,对尾矿库三维破坏区合理分析有利于确定尾矿库可能溃坝范围,为尾矿库风险分析提供依据.最后对三维强度折减法和二维极限平衡法进行了比较分析,结果表明尾矿坝临界滑移面位置和安全系数与三维地形相关,建议采用二维分析时计算剖面选取应考虑地形影响.According to the tailing pond, the curve fitting method is used for the generalization of the complex topography in the reservoir area, and the three dimensional numerical model with complex topography is set up. Based on the numerical model, the three dimensional stability against sliding of the tailing dam is carried out by the combination of the coupled fluid-solid theorem and the strength reduction FEM, and the three dimensional slide surface are determined. The slide surface shows as a plastic ring on the tailing dam surface, and the range of the plastic ring is directly related to the 3D topography of the tailing pond. Meanwhile, the longitudinal profile map of the slide surface shows as a circular arc approximately, and its depth has close relation to the 3D topography. The analysis of 3D failure zone is helpful to determine the dam-break region, which offers the basis for evaluation of the dam-break risk. In the final, the comparison of safety analysis between 2D method and 3D method is carried out,and the results show that the safety factor and the location of the critical slide surface are related with the 3D topography. Therefore, 3D topography influence should be considered to select the reference section for the stability analysis by 2D method.

关 键 词：三维稳定性分析 强度折减法 流固耦合 极限平衡法 尾矿库 

分 类 号：TU391[建筑科学—结构工程] TU392.5