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为准确分析尾矿坝稳定性,充分认识坝内透镜体对尾矿坝的安全影响,确定透镜体对坝体稳定性影响的主要参数,采用条分理论的Slide和有限差分理论的GMS,建立透镜体在尾矿坝的数值仿真模型,通过水位变化,结合水力梯度、浸润线、水压等特征因素及各土层力学参数的敏感性分析,确认透镜体对坝体稳定性的主要影响因素。结果表明:透镜体在坝体的位置分布和力学参数对尾矿坝安全系数存在影响;其摩擦角相比凝聚力的敏感度更高;与其他土层相比,透镜体水头损失更剧烈,水头梯度变化更明显,出现浸润线骤变、波动等现象,影响坝体的稳定性。
In order to accurately analyze the stability of tailings dam, fully understand the influence of dam body lens on the safety of tailings dam, determine the main parameters of the lens body on the stability of dam body, using slides theory and finite difference theory GMS Through numerical analysis of the lens body in the tailings dam, the main influencing factors of the lens body on the stability of the dam are confirmed by the change of water level, combined with the characteristic factors such as hydraulic gradient, wetting line and water pressure and the sensitivity analysis of mechanical parameters of each soil layer . The results show that the distribution of the lens body in the dam body and the mechanical parameters have an impact on the safety factor of the tailings dam; the sensitivity of the friction angle is higher than that of the cohesion; compared with other soil layers, the head loss of the lens body is more severe, Gradient change is more obvious, appeared wetting line sudden change, fluctuations and other phenomena, affecting the stability of the dam.