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为了快速有效地降低尾矿坝浸润面,结合某尾矿坝加高扩容工程,根据其初期排渗系统已部分失效的现状,拟定了后期扩容加高中土工席垫的排渗布置措施,为简化计算,建立包含土工席垫及其排渗管的尾矿库精细准三维渗流有限元分析模型及等效渗流分析模型,研究了土工席垫的等效模拟方法及相应的等效渗透系数,并将简化成果应用于尾矿坝全库整体模型的三维渗流计算分析,模拟土工席垫排渗措施的排渗效果,并研究其部分失效工况的尾矿坝渗流场。结果表明,采用土工席垫排渗措施后,可增大浸润面埋深,有效控制浸润面;土工席垫部分失效后,排渗效果稍微减弱,建议土工席垫由铺设3排改为铺设4排,其余保持不变,以更好地保证尾矿坝渗流稳定性。
In order to quickly and effectively reduce the infiltration surface of tailings dam, combined with a tailings dam expansion and expansion project, according to the initial drainage system has been partially failure of the status quo, developed in the late expansion of geotextile mats drainage arrangement measures to simplify The finite quasi-three-dimensional finite element analysis model and equivalent seepage analysis model of tailings dam containing geosyphon mats and drainage pipes are established, and the equivalent simulation method and corresponding equivalent permeability coefficient of geosynthetic mat are studied. The simplified results are applied to the 3D seepage calculation and analysis of the overall model of the tailings dam. The seepage effect of the seepage control measures is simulated and the seepage field of the tailings dam is studied. The results show that the geotextile mats can increase the buried depth of infiltration surface and effectively control the infiltration surface after geotextile mats have been drained away. After partial failure of geotextile mats, the drainage effect is slightly weakened. It is suggested that geotextile mats should be changed from laying 3 to laying 4 Row, the rest remained unchanged to better ensure the stability of seepage tailings dam.