某高尾矿坝考虑渗流作用下的抗震性能分析

渗流作用和地震作用是影响尾矿坝稳定的主要因素。以云南省某尾矿坝为研究背景，基于Geo-studio软件考虑初始渗流场的影响，研究尾矿坝渗流作用下的稳定性，以及地震作用下的动位移与加速度、液化区域与震时的关系、坝坡抗震稳定性、震后永久位移及地震作用下浸润线的变化。计算结果表明：尾矿坝在渗流-应力分析中处于稳定状态。在地震作用下，尾矿坝的水平位移沿着坝高向上不断增大，最大水平位移分布在堆积坝顶部。初期坝顶和堆积坝顶加速度放大倍数分别为1.67和1.87倍。液化区域主要分布于堆积坝浅层区域。尾矿坝震后永久变形量较小，不会发生整体滑塌，但震后浸润线位置较震前显著提高，考虑增设排渗措施防止发生渗流破坏。

Seismic performance analysis of a high tailing dam considering seepage

Seepage and earthquake are the main factors affecting the stability of tailings dam. A tailings dam in Yunnan Province is taken as the research background, based on Geo-studio software, considering the influence of the initial seepage field, the stability of tailings dam under seepage, the dynamic displacement and acceleration under earthquake, the relationship between liquefaction area and earthquake time, the seismic stability of dam slope, the permanent displacement after the earthquake and the change of infiltration line under earthquake are studied. The calculation results show that the tailings dam is in a stable state in the seepage - stress analysis. Under the action of the earthquake, the horizontal displacement of tailings dam increases along the dam height, and the maximum horizontal displacement is distributed at the top of the dam. The acceleration amplification factor of the initial dam crest and accumulated dam crest is 1.67 and 1.87 times respectively. The liquefaction area is mainly distributed in the shallow layer of the accumulation dam. The permanent deformation of the tailings dam after the earthquake is small, and no overall collapse will occur. However, the position of the saturation line after earthquake is significantly higher than that before earthquake, and additional drainage measures are considered to prevent seepage failure.