恰木萨水电站输水渠道结构设计与基础处理

Structural design and foundation treatment of diversion channel for Qiamusa hydropower station

结合恰木萨水电站输水渠道工程地质条件,通过前期基础处理方案比选,根据现场开挖揭露出的实际地质情况,对输水渠道结构设计形式及基础处理做了优化和调整,确定输水渠道采用梯形横断面、现浇C20混凝土衬砌、两层两布一膜防渗的结构形式,基础处理采用换填砂砾石,粉土厚度小于10 m全部挖除并换填砂砾石,粉土厚度大于10 m只挖除10 m厚粉土并换填砂砾石。目前,该设计方案正在实施中。

Combining with the engineering geological conditions, the foundation treatment schemes for the diversion channel of Qiamusa hydropower station had been compared and selected at preliminary design stage. According to the actual geological conditions exposed after site excavation, the structural design and foundation treatment scheme of diversion channel were optimized and adjusted to be trapezoidal cross section, in situ casting C20 concrete lining,anti-seepage structure of two layers of double clothes and one membrane. For foundation treatment, silt of 10 m thick to the most was replaced by sandy gravel. The project is under construction now.