坪头水电站地下厂房渗控措施效果研究

Study on Underground Powerhouse Seepage Control Efficiency of Pingtou Hydropower Station

地下厂房洞室群渗流场中密集排水孔排水幕的处理一直是工程渗流特性和渗控研究的重点,由于排水孔(幕)众多,渗控作用大,须尽可能精确模拟,这对网格划分提出了极高的技术要求。文章采用严密的改进排水孔结构技术[1](使整体三维模拟排水孔(幕)的实际渗流行为和渗控效果成为现实),通过多方案比较对裂隙岩体中地下厂房的防渗帷幕、排水孔(幕)等渗控措施的渗控效果进行详细地研究,很好地解决了坪头地下厂房洞室群岩体渗流场的求解和该工程复杂渗流特性与控制的应用研究。

It is difficult to simulate drainage curtain consisted of densely distributed numerous drainage holes, which is a key point of seepage control measures. Drainage holes （curtains） must be simulated exactly to obtain the refined solution to the seepage field, which is highly demanding on the technique of mesh generation. Based on the technique of improved drainage substructure which is very rigorous in theory, the article compares different measures of seepage control such as anti-seepage curtain, drain hole of underground plant in fractured rock mass to make a detailed study, and makes it real the seepage of whole 3D simulated drainage holes （curtain） and its effectiveness of seepage control in underground hydropower house of Pingtou Hydropower Station.