基于渗流-应力耦合分析的野鸡尾尾矿坝稳定性研究

基于渗流场与应力场耦合机理,对柿竹园野鸡尾尾矿坝进行稳定性研究。研究渗流-应力的耦合效应,提出了渗流-应力耦合以及渗流体积力计算的实施方案;建立二维的有限元渗流-应力耦合计算模型,分析了考虑耦合效应时的尾矿坝渗流场、位移场、应力场;最终分析了不同耦合关系对于渗流量、位移场、等效渗透集中力以及应力场的影响。研究结果表明：当前水力条件下,尾矿坝稳定性良好;尾矿坝主要受水平渗透力作用,初期坝坝顶、坝脚以及坝底等处应力集中;尾矿坝的渗流-应力作用不容忽视,不同的耦合关系对于x方向位移、渗透力的预测影响巨大;考虑渗流-应力耦合关系得到的主应力、剪应力以及竖向位移,比不考虑耦合效应时大。

Stability Study for Yejiwei Tailings Dam Based on Coupling Analysis of Seepage-stress

Based on the coupling mechanism of seepage field and stress field,the stability study of Yejiwei Tailings Dam in Shizhuyuan is carried out.Firstly,the coupling effect of the seepage and stress is studied.Then the calculation schemes about the analysis on the coupling of seepage and stress as well as the body forces of seepage are proposed sequentially.A two-dimensional calculation model for seepage-stress coupling analysis is established.The seepage field,displacement field,stress field and yield zone are analyzed using the proposed model;the influence of various coupling relationships on the seepage and displacement field,equivalent concentrated forces of seepage and vertical displacement is studied ultimately.The results show that the tailings dam is stable under the current hydraulic conditions;the vertical displacement is the dominating component,and the observed dam suffers mostly from the horizontal seepage forces;stress concentration occurs at the top,the bottom and the foot of the dam;the coupling effect of seepage-stress can＇t be ignored because the predicted seepage forces and horizontal displacement changes greatly in different coupling models and the principle stresses,shear stresses and vertical displacement are larger than those obtained in the uncoupled calculation model.