浅析飞仙关电站主厂房至左岸非溢流坝基础防渗效果

Analysis on Foundation Seepage Prevention Effect of Non-overflow Dam from Main Workshop to Left Bank in Feixianguan Hydropower Station

基于渗压水位、绕坝渗流、渗流量等监测资料,结合地质及防渗措施,对飞仙关水电站主厂房至左岸非溢流坝基础防渗效果进行评价。结果表明:该段帷幕下游侧基础渗压水位偏高,渗压系数介于0.54~0.97,左岸绕渗水位较高,且厂房存在多个渗水点,基础防渗系统效果不佳;而左岸帷幕未与左岸非溢流坝之间形成幕包墙是导致渗压水位偏高的最可能原因。目前渗流渗压基本稳定,暂不会对坝体坝基的渗透安全产生实质影响。

Geological and seepage prevention measures are combined to evaluate the foundation seepage prevention effect of non-overflow dam from the main workshop to left bank in Feixianguan Hydropower Station based on the monitoring data of seepage pressure water level,seepage around the dam,seepage flow,etc.The results show that the foundation seepage pressure water level is high at the downstream area of the curtain in the section,the seepage pressure coefficient is between 0.54 and 0.97,the seepage water level around the left bank is high,and there are several seepage points in the workshop,so the effect of the foundation seepage prevention system is not good.The most probable reason for the high seepage pressure water level is that the curtain covering wall is not formed between the left bank curtain and the left bank non-overflow dam.Currently,the seepage pressure is basically stable and will not have substantial influence on the seepage safety of the dam body and foundation.