某尾矿坝渗流场数值模拟及坝体稳定性分析

Numerical Simulation of Seepage Field Analysis of a Tailings Damand Its Impact on the Stability of the Dam

尾矿坝坝体加高会改变库体堆填物的渗流特性,影响坝体的安全性。综合运用钻孔勘探成果和室内渗透试验所得渗透系数,建立了尾矿坝渗流分析模型,应用二维有限元数值计算软件GEO-SEEP,对某尾矿坝加高后的渗流场进行了计算分析。分析结果表明,天然工况下,加高后尾矿坝库区浸润线偏高,不利于尾矿坝的安全稳定运行。为此在优化加高方案中提出了加强排渗设施的初步方案,数值模拟结果表明,该方案能较好地降低坝体浸润线,提高坝体稳定性。在尾矿坝排渗设施布置时,通过渗流模拟可以检验排渗方案的合理性。

Tailings dam heightening change the seepage field characteristics of landfill material and influence the safety of the dam. Based on the actual drilling exploration results and permeability coefficient obtained from penetration test of indoor drill hole sampling,the best inversion actual seepage model was established,by means of the application of two-dimensional finite element numerical calculation software GEO-SEEP,to get the calculation analysis of heightening seepage field of tailings dam,and the key elements distribution map of seepage field were obtained. The analysis results show that the heightening tailings dam reservoir infiltration line on the high side in natural conditions make against to the safe and stable operation of the tailings dam. Therefore,put forward a preliminary scheme of strengthen drainage facilities in optimization scheme,through the numerical simulation validation,the scheme can reduce the dam saturation line. In the drainage facilities layout of tailings dam,through the seepage simulation,the rationality of drainage scheme can be examined,provided reliable basis and technical support for the safety design and construction of the tailings dam drainage facilities.