CCS水电站压力管道透水衬砌结构设计研究

Permeable Lining Structure Design and Research on the Penstock of CCS Hydropower Station

厄瓜多尔CCS水电站压力管道具有埋深大、水头高等特点,常规不透水衬砌设计将导致配筋量过高而难以适用。CCS水电站压力管道采用了透水衬砌设计,在对透水衬砌渗流场与有限元结构耦合作用分析的基础上,根据内力值计算了衬砌的配筋量。结果表明:在完建与检修工况下,衬砌混凝土自身能够满足应力需要,可不配置钢筋;在正常运行工况下,透水衬砌所需配筋量较小;在水击工况下,衬砌所需配筋量相对较大,为透水衬砌配筋的控制工况。与常规不透水衬砌相比,透水衬砌设计可大大节省配筋量,并且计算结果与工程实际情况更为符合。

The penstocks of CCS Hydropower Station in Ecuador are characterized by deep buried depth and high waterhead.The conventional lining design leads to much reinforcement.The permeable lining is adopted in the CCS penstock.The coupling analysis of the seepage field and the finite element structure of the concrete lining was carried out and the permeable lining reinforcement was calculated.The result shows that the lining concrete can meet the stress requirements under the condition of completion and maintenance.For operating condition,the re⁃inforcement needed by the permeable lining is quite small.For water hammer condition,the reinforcement needed by the permeable lining is quite large compared with the operating condition.The permeable lining is suitable in practice,and it can greatly reduce the amount of rein⁃forcement compared with the conventional lining.