虹吸井对尾矿坝地震液化的影响分析

Influence Analysis of Siphon Well on Liquefaction of Tailing Dam during Earthquake

为了解虹吸井对尾矿坝地震液化的影响,以东北地区弓长岭尾矿坝为例,通过在坝体施加虹吸井的方法进行动力计算,比较了排渗措施失效后与施加虹吸井后对坝体及库区液化区分布的影响,并通过有限元方法和拟静力法计算了坝坡的安全系数。结果表明,排渗措施失效后液化区主要分布于坝体溢出点以下区域及尾矿库库区内,坝体安全系数不符合规范要求,且尾矿坝不安全;施加虹吸井后液化区显著减小,仅分布于尾矿库库区内,库区水边线附近分布区域最大,且坝体安全系数能满足现行规范要求,尾矿坝安全稳定。

In order to understand the impact of the siphon wells on the tailings dam earthquake liquefaction, taking Gongchangling tailings dam in the northeast China for an example, dynamic calculation is implemented by the method of imposing siphon well on the dam. The effects of liquefaction area distribution of the dam and reservoir area after the failure of draining measures and application of the siphon well are compared. And the slope safety factor of the dam is calculated by using finite element method and quasi-static method. The results show that the primarily liquefied area is in the reservoir and the area below overflow point if the measures of draining leakage is failure; the dam safety factor does not meet the specification requirements and the railings dam is not safe; after application of the siphon well, the liquefied area reduces significantly, which is only in the reservoir area; the region near water line is the maximum and the dam safety factor reaches the current specification requirements; the tailings dam is safety and stability.