尾矿坝液化流动变形分析

介绍了基于双线性模型的砂土液化流动变形分析方法,并用二维商用软件ALID(Analvsis for Liquefaction.induced Deformation)分析了Moch.koshi尾矿坝地震液化流动变形,其中滩长分别按5 m和38 m,坝基土液化和非液化共计3种组合.通过计算分析发现了该坝在不同条件下发生液化流动变形的一些规律.计算结果表明,增加滩长、降低水位线的高度.将有助于减小坝体液化流动变形.增强坝体的稳定性;坝基土发生液化流动将导致尾矿坝整体发生流滑.探讨了用反压体、稳定柱、加筋和密实等措施抑制尾矿坝液化流动变形.

Analysis of liquefaction-induced flow deformation of tailings dam

A simplified procedure for the analysis of liquefaction-induced residual deformation is introduced based on the bilinear model. By using the finite element code ALID(Analysis for Liquefaction-Induced Deformation), liquefaction-induced flow deformation of Mochikoshi tailings dam under different conditions is estimated. They include a dry beach 5 m long with liquefied or non-liquefied foundation soil and a dry beach 38 m long with non-liquefied foundation soil. Through calculation and analysis, some rules of liquefaction-induced flow deformation of this tailings dam are found. The analytical results show that the longer dry beach and lower water table induce the smaller deformation and keep the better stability. If the liquefied foundation soil flows, tailings dam will wholly slip. Moreover, some countermeasures for liquefaction-induced flow deformation, such as forcing buttress, stabilizing column, densification foundation and reinforcement with fibre, are discussed.