Application of Finite Element Analysis in Seepage and Anti-slip Stability of Tailings Pond
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摘要: 某新建尾矿库初步设计拟采用一次性筑坝，坝型为碾压式土石坝，为评价设计方案的合理性以及尾矿库的安全性，采用有限元方法对尾矿库渗流稳定性和抗滑稳定性分析计算，结果表明，尾矿坝采用的渗控体系能够满足大坝的防渗要求，坝体上游侧的HDPE土工膜起到了较好的截渗效果，库内浸润线分布规律合理，下游设计排渗系统起到了较好的排渗效果；在正常蓄水位、最高洪水位和地震等3种工况下，尾矿坝下游边坡的抗滑稳定性均满足规范要求，设计方案合理可行。Abstract: In the preliminary design of a proposed tailings pond, one-time dam construction is adopted, and the dam type is roller compacted earth rock dam. In order to evaluate the rationality of the design scheme and the safety of the tailings pond, the seepage and anti-slip stability of the tailings pond were calculated by the finite element method. The results show that the seepage control system adopted by the tailings dam can well meet the seepage control requirements. The HDPE geomembrane on the upstream side of the dam has played a good seepage interception effect, and the distribution law of the infiltration line in the reservoir is reasonable. At the same time, the drainage system designed for the downstream has played a good seepage effect. Under the three conditions of normal storage level, maximum flood level and earthquake, the sliding stability of the downstream slope of tailings dam meets the specification requirements, proving that the design scheme is reasonable and feasible.
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Key words:
- tailings pond /
- seepage field /
- anti-slip stability /
- finite element analysis
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表 1 二维渗流有限元计算参数取值
材料名称 渗透系数/(m·s−1) kx ky 碾压堆石料 3.00×10−4 3.00×10−4 碾压土石料 3.00×10−6 3.00×10−6 尾粉土 1.25×10−6 1.25×10−6 尾粉质黏土 3.00×10−8 3.00×10−8 尾黏土 2.00×10−9 2.00×10−9 HDPE土工膜 1.00×10−12 1.00×10−12 强风化基岩 1.00×10−6 1.00×10−6 
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表 2 主要材料力学特性指标
材料种类 天然重度
γ /(kN·m−3)抗剪强度 c/kPa φ/(o) 碾压堆石料 22.0 0.0 41.0 碾压土石料 18.5 26.0 24.0 尾粉土 20.0 9.8 28.0 尾粉质黏土 19.5 10.8 16.0 尾黏土 18.0 13.7 8.0
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