防渗电解锰渣库流固耦合稳定性分析  

Slope Stability Analysis for Electrolytic Manganese Tailings Pond Based on Fluid-structure Interactions Theory

作　　者：刘宁[1] 甘宇宁 陈兵[1] 

机构地区：[1]上海交通大学,上海200240 [2]深圳市胜义环保有限公司,广东深圳518067

出　　处：《矿冶工程》2014年第2期20-24,共5页Mining and Metallurgical Engineering

摘　　要：以电解锰工程性质为基础,使用流固耦合的极限平衡法,对铺膜防渗锰渣库的边坡稳定性进行了分析。分析表明,铺膜防渗显著降低了锰渣库边坡的稳定性。库底导渗系统对维持锰渣库边坡稳定性发挥着至关重要的作用。山谷型铺膜防渗锰渣库在运行期间的边坡抗滑稳定安全系数可能低于终期抗滑稳定安全系数,运行前期渣库快速上升阶段安全系数为最低,而最危险滑动面经过防渗膜与锰渣的界面。因此,锰渣库初期坝上游坡面和底部设计坝高持力区不应使用光面膜,而应当使用双糙面膜。库底导渗系统须有足够的抗压能力,以保证其长期发挥作用。渣库运行前期应增加导渗体的密度,加速锰渣排水固结。With an electrolytic manganese project as an example, slope stability analysis was performed with limit equilibrium of fluid-structure interactions for the electrolytic manganese tailings pond which was covered with HDPE geomembrane for seepage-proofing treatment. The analysis reveals such anti-seepage treatment has remarkably reduced the pond slope stability, because the seepage drainage on the bottom of pond is of great importance to the maintenance of the pond slope stability. As for those electrolytic manganese tailings pond constructed in valleys, if being covered with HDPE geomembrane, the factor of safety against sliding during its operation may be lower than that near its terminal time, because the factor of safety against sliding is turning to the lowest level with the tailings height rapidly increasing in the pond, and the critical failure surface will go through the interface between manganese slag and HDPE geomembrane. As a result, textured geomembrane should be used for upstream slope of the dam and areas beneath the manganese slag slope in its early operation stage. The bottom drainage system should have sufficient bearing capacity to ensure long-term performance under high pressure. Furthermore drainage system should be installed in a more dense arrangement during early stages of tailings pond operation to facilitate consolidation of manganese slag and stability of manganese slag slope.

关 键 词：锰渣库 边坡稳定 安全系数 高密度聚乙烯膜 

分 类 号：TU411[建筑科学—岩土工程]