黄河小浪底水利枢纽排沙洞后张法预应力混凝土衬砌的设计研究

简介黄河小浪底水利枢纽复杂的水文、地质条件以及庞大的工程规模．该枢纽设计有３ 条排沙洞，担负着泄洪、排沙、调节径流和保证进水口不被泥沙淤堵的任务．根据排沙洞的水库运用要求，灌浆帷幕下游排沙洞洞身段设计为混凝土后张预应力隧洞．通过大量的调研、试验、分析论证，在施工前确定该预应力方案选用无粘结预应力系统，成为目前世界上规模最大的无粘结预应力隧洞衬砌工程，在国内尚属首例．

Design of Post-Tensional Prestressed Concrete Lining of Desilting Tunnels of Xiaolangdi Multi-Purpose Dam

Complicated hydrologic and geographic conditions,and the large scale of the Xiaolangdi Hydraulic Project on the Yellow River are introduced briefly.Three desilting tunnels are designed to meet the requirements of flood control,sediment discharge and runoff regulation.According to the performance requirements of desilting tunnels,the tunnel lining down stream of the grouting curtain is designed to be post tensional prestressed lining.On the basis of investigation and research,experiements and analysis,the unbonded prestressing system is used.It is the largest unbonded prestressed tunnel lining project in the world,and the first one in China.