西藏老虎嘴水电站左岸防渗墙布置方案优化  

Layout Optimization of Left Bank Cutoff Wall of Laohuzui Hydropower Station in Tibet

作　　者：赵忠伟[1] 赵坚[1] 沈振中[1] 

机构地区：[1]河海大学水利水电工程学院,江苏南京210098

出　　处：《水力发电》2009年第7期37-39,共3页Water Power

摘　　要：老虎嘴水电站左岸为古河槽,覆盖层最深达203m,初步设计采用悬挂式防渗墙进行渗流控制。在深入分析左岸渗流场特性的基础上,对悬挂式防渗墙的长度、左端深度进行优化,选定满足渗流控制要求且面积最小的防渗墙布置方案。通过对优化结果进行分析可知,取消右下部防渗墙对渗透流量影响较小,防渗墙起坡点位置及防渗墙长度对渗透坡降影响较大。此外,确定了左副坝防渗墙的压力水头,可供验算垂直防渗墙的稳定性以及防渗墙的结构应力。The Left bank of the Laohuzui Hydropower Station stands in an ancient fiver channel, with the depth of its overburden layer of 203 m. The suspended cutoff wall was chosen for seepage control in its initial design. Based on the deep analysis of the seepage characteristics in the left bank, the optimization of the length of suspended cutoff wall and the depth of its left-end was carried out and then a cutoff wall layout scheme was chosen, which can meet the needs of seepage control and has the minimum area. The optimization results showed that cancelling the right lower cutoff wall would bring a little impact to seepage flow but the starting position and length of cutoff wall have great influence on the seepage gradient. In addition, the maximum depth of cutoff wall is 80m and its depth reduces from 240m in its right end to 40m in its left end. The pressure head of left auxiliary dam was determined, which can be used for checking the stability and structural pressure of vertical cutoff wall.

关 键 词：深厚覆盖层 混凝土防渗墙 布置 方案优化 有限单元法 老虎嘴水电站 

分 类 号：TV640.31[水利工程—水利水电工程]