洪屏电站上水库库底土工膜防渗结构设计

Geotechnical Membrane Seepage Control Design of the Upper Reservoir Bottom of Hongping Pumped-Storage Power Station

洪屏抽水蓄能电站上水库库底与地下厂房之间存在断层垂直渗透通道。渗漏不仅造成经济损失,而且增加厂房排水系统压力,影响厂房正常运行,因此需进行防渗处理。洪屏电站上水库天然径流丰富,且库底断层渗漏属于垂直渗透,不会直接危害到主体建筑物的安全,因此防渗的主要目的是降低渗漏量,减小厂房排水压力及对厂房正常运行的不利影响。综合考虑上水库建筑物布置、断层渗透特性、防渗目标以及投资影响,库底防渗结构采用半封闭、不设排水系统的土工膜防渗方案。该方案结构简单、施工方便、投资较省,计算表明,该方案可有效减小渗漏量,满足防渗要求。

The upper reservoir of Hongping Pumped Storage Power Station exists some vertical infiltration channels of fault age between the reservoir bottom and the underground powerhouse. The leakage not only causes economic losses,increases the pressure of the plant drainage system,but also endangers the normal operation of the plant. So the treatment should be carried out. The reservoir natural runoff is abundant and the bottom of the reservoir is a vertical seepage,which will not directly endanger the safety of the main building,so the main purpose of the seepage prevention is to reduce the leakage,reduce the pressure of the plant drainage system and the adverse impact on the normal opera-tion of the plant. Taking into account the layout of the reservoir,the characteristics of the faults,the target of the seepage prevention and the influence of the investment,the geotechnical membrane anti seepage structure with semi enclosed and no drainage system was used at the bot-tom of the reservoir. This scheme has the advantages of simple structure,convenient operation and investment saving. According to the calcu-lation ,the scheme can effectively reduce the leakage and meet the requirements of anti-leakage.