水布垭地下厂房帷幕灌浆廊道施工支洞封堵加固处理

Reinforcement Treatment of the Plug in Construction Adit of the Curtain Grouting Gallery for Underground Powerhouse of Shuibuya Hydropower Station

针对水布垭水电站地下厂房帷幕灌浆廊道江边施工支洞堵头出现的渗水情况,结合监测数据分析,对渗水原因进行查找,发现建设期未按设计要求进行封堵,且封堵段存在狭缝状岩溶裂隙延伸至山体表面,遇强降雨及泄洪工况出现大量渗水。采取地表封闭、堵头加固等综合处理措施后,经主汛期强降雨检验,堵头渗水问题得到有效解决。

In the construction adit of the curtain grouting gallery for underground powerhouse of Shuibuya Hydropower Station,excessive seepage through the plug is observed.Based on the analysis of the monitoring data,it is found that the seepage issue is caused by several problems.Firstly,the plugging process in the construction period is not carried out strictly following the design requirements.In addition,slit-shaped karst fissures extending to the mountain surface exist in the plug section.Thus,excessive seepage occurs in case of heavy rainfall and flood discharge.Correspondingly,comprehensive treatment measures are implemented,including the surficial closure and plug reinforcement.Actual operation situation of the station during heavy rainfalls in the main flood season after the treatment shows that the seepage problem of the plug is effectively solved.