南水北调西线一期工程引水隧洞冲淤机理研究

Study on desilting mechanism of water conveyance tunnels in Phase I Project of Western Route of South-to-North Water Transfer Project

研究了南水北调西线一期工程隧洞运行后的淤积机理及其影响,结果表明,由于水体泥沙以悬移质超细泥沙为主、水土泥沙含量小及隧洞温度等对隧洞影响很大,会加速隧洞的淤积,只有当水的流速达到泥沙启动速度时,泥沙会启动而被水流带走,引水隧洞不会淤积。研究结果对引水隧洞工程实践具有很好的参考价值。

Study on the mechanism of the siltation in the water conveyance tunnel of the Phase I Project of Western Route of South-to-North Water Transfer Project and its effects after the operation is made herein. The results show that the tunnel is greatly affected by the less silt content, which consists mainly of the finest silt of the suspended load, and the temperature of the conveyed water, so the siltation is to be accelerated. The study demonstrates that the tunnel can not be silted only when the water velocity reaches the starting-up velocity of the desihing and the sediment can be carried away. The results provide a better reference to the similar project of water conveyance tunnel.