基于应力场与渗流场耦合的尾矿坝稳定性

Stability of tailings dam under coupled stress and seepage field

为探求应力场和渗流场耦合作用对尾矿坝稳定性的影响,采用有限元软件MIDAS,建立Mohr-Coulomb准则的分析模型.在重力作用下,分析不同干滩长度工况下应力场和渗流场的耦合作用,用强度折减有限元法分析尾矿坝稳定性.结果表明:随着干滩长度的减少,剪应变区域增大并形成贯通区,较大的剪应变出现在堆积坝靠近初期坝处,尾矿坝安全系数降低,不利于尾矿坝安全.因此,矿山企业要加强尾矿库现场管理,采用合理排渗措施,以保证尾矿坝安全运行.

To analyze effect on stability of tailings dam coupled with stress field and seepage field, this study established Mohr-Coulomb criterion analysis model by using the finite element software MIDAS, analyzed effect coupling with stress field and seepage field based on beach width conditions, and analyzed stability of tailings dam using SRM. The analysis indicates that shear strain region increased and large shear strain lay near tore of starter dam when beach width were decreased. At the same time, safety factor of railings dam were reduced, which was not conducive to the safety of tailings dam. Therefore, management should be strengthen by mining enterprises and measures of drainage should be taken to ensure safety of the tailings dam.