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针对尾矿库坝体加高影响其稳定性的问题,基于有限差分法采用渗流与应力耦合模型,对某尾矿坝在4种不同工况下进行渗流场和静力场分析。渗流场计算结果表明:加高坝体在洪水位工况下,坝体内自由面比现状坝洪水位工况升高很多,浸润线最小埋深为5.88 m,小于规范规定的最小埋置深度6~8m,加高坝体在洪水位工况是不安全的,需采取加固措施。应力场计算结果表明:加高坝体洪水位工况下,初期坝坝脚外坡处应力水平值为0.8,坝坡靠近堆积坝坝顶处应力水平值为0.75,应力水平过大,需采取加固和排渗措施,分析结果与渗流场分析结果一致。
Aiming at the problem that the height of tailing dam dampened its stability, the finite element method was used to analyze the seepage field and static field of the tailings dam under 4 different conditions by using coupled seepage and stress model. The calculated results of seepage field show that under the conditions of flood level, the height of free surface in dam body is much higher than that of current dam flood, the minimum depth of infiltration line is 5.88 m, which is less than the minimum embedment depth 6 ~ 8m, heightening the dam in the flood conditions is not safe, need to take reinforcement measures. The stress field calculation results show that the stress level at the initial footing of the dam is 0.8 when the flood level is raised and the stress level at the top of the dam near the heaping dam is 0.75 and the stress level is too large to be taken Reinforcement and drainage measures, the analysis results consistent with the results of seepage field analysis.