大型尾矿坝加高过程三维渗流分析

Three-dimensional Seepage Analysis on Heightening Process of Large Tailings Dam

采用三维有限元渗流和稳定性分析相结合的方法,对大型尾矿坝加高过程进行稳定性评价。分析结果表明:现状坝体的浸润线高度和渗流路线正常,稳定性系数满足要求,但安全储备量不大;加高坝体时浸润线高度变动不大,排渗设施对降低浸润线有重要作用。当坝高加高到100m坝高时,坝坡抗滑稳定安全系数稍小于规范值,继续增加坝高导致坝坡抗滑稳定系数与规定值差距较大,不满足规范要求。通过数值计算确定了尾矿坝加高限值为100m,并给出填筑过程的建议措施。

Using the integrated research methods combing three dimensional FEM seepage and stability analysis,the stability evaluation for heightening process of a large tailings dam were conducted.Analysis results show：the height of saturation line and seepage flow line of present situation of the dam are normal,and the stability coefficient satisfies the requirement of code,but not much security reserves;the saturation line height change is not big while the dam is heightened,the drainage facilities have an important role in reducing seepage line height;while the dam height raises to 100 m,the dam slope stability safety coefficient against sliding is slightly less than code regulated data;while the dam height raises,the dam slope stability safety coefficient has great gap than specification,did not meet the requirements of code.On this basis,the 100 m tailings dam heightening limit is put forward,the proposal measures of dam heightening were given.