尾矿库抗震液化及震后稳定性分析

Analysis of Anti-liquidation and Stability of Tailings Pond

通过对御驾泉尾矿库在地震作用下的动力反应及液化分析,比较345m和370m筑坝两种工况,得出坝体在特征地震波作用下,动力反应不显著,只在水面区域变形稍大,坝体形态较完好。地震产生的超孔隙水压力的消散总是在地震结束后,采用瑞典法和简化毕肖普法分析表明,震后坝内安全系数变化不大,均满足规范要求。为保证坝体安全应加强坝内浸润线观测,当浸润线埋深小于6m时,应及时采取工程措施。

Through analysis of dynamic response and liquidation of Yujiaquan tailings pond,comparison is made on working conditions of two dams with elevation of 345m and 370m respectively and it came to the conclusion that dam body has inconspicuous dynamic responses and basically remain intact under the influence of specific seismic wave,only having large deformation around water surface.Quake-incurred excess pore water pressure always dissipates after quake was over.Analysis is made by use of Sweden method and simplified bishop method and the results show that post-earthquake safety coefficients of dams vary slightly but still meet specification requirements.To ensure safety of dam body,more strict observation shall be kept on phreatic line of dam and engineering measures shall be taken without delay when buried depth of phreatic line is less than 6m.