基于非饱和土渗流理论的尾矿库流固耦合分析  

Analysis of the Fluid-solid Interaction in Tailings Pond Based on the Unsaturated Soil Seepage Theory

作　　者：汤卓[1,2] 谢建斌[1,2] 李丞文 卢海军[1,2] 胡井友[3] 

机构地区：[1]云南大学土木工程系,云南昆明650091 [2]云南大学城市建设与数字城市实验中心,云南昆明650091 [3]西南交通大学土木工程学院,四川成都610031

出　　处：《防灾减灾工程学报》2016年第6期994-1001,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51264037;61163061);云南省应用基础研究计划面上项目(2011FB010;2012FB117);云南大学中青年骨干教师科研项目(XT412003)资助

摘　　要：基于非饱和土渗流理论,针对某上游法尾矿库工程地质、水文地质条件以及库内尾矿的物理力学性能试验成果,建立了尾矿库三维有限元模型,研究了尾矿的土-水交互特征曲线,分析了尾矿库的渗流场、应力场以及流固耦合效应,总结出了上游法尾矿库流固耦合计算规律。结果表明:(1)与不考虑流固耦合作用相比,考虑流固耦合作用时尾矿库堆积坝内浸润线平均埋深更符合实际、更趋合理;(2)与不考虑流固耦合作用相比,考虑流固耦合作用时尾矿库内正孔隙水压力更大,而考虑流固耦合作用时尾矿库内负孔隙水压力则更小;(3)与不考虑流固耦合作用相比,考虑流固耦合作用时尾矿库内最大Von-Mises应力和最大切应力均更小;(4)连续流固耦合只需耦合计算1次,完全流固耦合则需多次耦合计算,完全流固耦合作用时的计算精度随耦合计算次数增加而趋于精确,尾矿库流固耦合分析宜采用完全流固耦合分析方法。According to the engineering geology and hydrologic geology conditions of one selected tailings pond,which was built by upstream method,the 3Dfinite element model of this tailings pond was established on the basis of the unsaturated soil seepage theory and the physical and mechanical properties of tailings in the tailings pond.Soil water characteristic curve（SWCC）of the tailings has been studied.The seepage field,the stress field and the fluid-solid interaction of the tailings pond were analyzed.The disciplines of fluid-solid interaction calculation for upstream tailings dam were summarized in this work.Results show that：（1）The average depth of the infiltration line in tailings dam containing fluid-solid interaction is more realistic and reasonable than that of non fluid-solid interaction.（2）In comparison with tailings pond not considering fluid-solid interaction,the positive pore water pressure is greater and the negative pore water pressure is smaller in tailings pond considering the fluid-solid interaction.（3）The maximum Von-Mises stress and maximum shear stress in tailings pond considering fluid-solid interaction are all smaller than that of tailings pond not considering fluid-solid interaction.（4）It only calculates one time to solve the tailings pond considering the continuous fluid-solid interaction,but needs multi coupling calculation steps when considering complete fluid-solid interaction.The precision of obtained results is increased with the coupling calculation times when using complete fluid-solid interaction method.So adopting the complete fluid-solid interaction method is a more appropriate way to analyse the tailings pond,which contains fluid-solid interaction.

关 键 词：流固耦合 非饱和土渗流 三维有限元 渗流场 应力场 尾矿库 

分 类 号：TD32[矿业工程—矿井建设]