复杂地质条件下某中线法高尾矿坝三维渗流有限元计算分析

Finite element calculation analysis of 3D seepage for a high tailings dam with midline method under complex geological conditions

强震区高尾矿坝的稳定安全一直是尾矿行业关心和研究的重要课题,而复杂地质条件下的渗流场分析是为了确定库区坝体浸润线埋深,是进行高坝抗震安全分析的重要前提。中线法尾矿坝具有坝体抗震性能好、稳定性高、不易液化等优势,故在强震区一般选择中线法堆高尾矿坝。本文针对强地震区某复杂地质条件下的中线法高尾矿坝(总坝高为200 m),在考虑材料饱和-非饱和特性基础上,采用三维有限元渗流分析方法,对尾矿库库区天然状态下和堆至最终标高时正常工况、洪水工况下尾矿坝三维渗流场进行数值模拟分析,研究了三维渗流场、浸润线及尾砂渗透坡降的合理分布规律。该研究成果可为尾矿坝的抗震安全稳定分析提供依据。

The stability and safety of high tailings dam in strong seismic region has been an important subject of concern and research in the tailings industry,and the analysis of seepage field under complex geological conditions is to determine the depth of the dam infiltration line in the reservoir area,which is an important prerequisite for the seismic safety analysis of high dams.Tailings dam by centerline method has the advantages of good seismic performance,high stability and hard liquefaction,so the centerline method of stacking high tailings dam is generally chosen in strong seismic region.In this paper,aiming at the high tailings dam by centerline method(total height of 200 m)under complex geological condition in strong seismic region,on the basis of considering the saturated-unsaturated properties of the material,finite element of 3 D seepage analysis method is used to numerically simulate the three-dimensional seepage field of the tailings dam in the natural state and under normal and flood conditions at the final elevation of the tailings storage area,and the reasonable distribution law of the three-dimensional seepage field,the seepage line and the tailings seepage slope is studied.The research results can provide a basis for the seismic safety and stability analysis of tailings dam.