基于有限元的某水电站坝肩防渗墙优化设计研究

Study on Optimal Design for Cut-off Wall's Lengths in Abutment of a Certain Hydropower Station Based on Finite Element Method

某水电站左右岸坝肩均存在绕坝渗流问题,设计时考虑了防渗墙措施,为了优化防渗墙的长度和评估渗漏量,模拟了右岸防渗墙长度50 m7、5 m1、00 m1、25 m、150 m,左岸防渗墙长度是其两倍等5种计算工况,目的是优化右岸防渗墙长度。在此基础上,又设计了左岸防渗墙长度125 m1、50 m1、75 m等3种计算工况。渗流场分析,发现不同部位的渗漏量、渗流速度和水头值均随着防渗墙的延伸单调递减,右岸防渗墙长度100 m和左岸防渗墙长度150 m时,两侧坝肩岩土体和防渗墙体同时满足防渗设计要求。

There exists the seepage problem around the dam in the abutment of a hydropower station,so the cut-off wall is considered in design.In order to optimize the length of the wall and estimate the quantity of the leakage,five kinds of computing schemes for the lengths of the cut-off wall on the right bank such as 50 m,75 m,100 m,125 m,150 m and with the two-times length of the left wall are designed to obtain the optimal length of the right bank wall.Based on these,three types of the wall＇s lengths on the left bank being 125 m,150 m,175 m are designed,too.From the results of flow fields analyzing,it is found that the leakage,seepage velocity and water head in different part would be decreased with the increase of the cut-off wall＇s length,that the rock and soil mass or the body of the cut-off wall could meet the requirement of anti-seepage design with the length of the wall on the right bank being 100 m and the left one being 150 m.