中东某抽水蓄能电站500 m深竖井施工渗水处理研究

Research on seepage treatment during the construction of 500 m deep shaft of a pumped storage power station in Middle East

以色列某抽水蓄能电站引水调压井和高压竖井总深度约500 m,采用正井法开挖,施工环境要求高。开挖施工过程中有大量地下水渗出,采取帷幕灌浆截渗和抽排水相结合的处理措施,使开挖施工能够顺利进行。在高压竖井钢衬施工前,对初期衬砌间的渗水进行了专门引排,消除了渗水对钢衬焊接施工的影响,取得了较好的效果。同时,从施工环境、施工质量和作业效率等角度,提出了渗水处理措施的改进思路,为类似工程施工提供借鉴。

The total depth of surge shaft and penstock shaft of a pumped storage power station in Israel is about 500 m.The excavation was implemented by front well drill method,which had high require⁃ments for construction environment.There was a large amount of groundwater seepage during the excava⁃tion construction.The treatment by combination of curtain grouting and pumping was adopted.Before the construction of steel lining for penstock shaft,the seepage in initial linings was diverted to remove the influence on steel lining construction,which achieved good results.Meanwhile,the seepage treat⁃ment measures were improved from the perspectives of construction environment,construction quality and operation efficiency,which can provide reference for similar projects.