三峡工程大江截流水力学试验研究

Hydraulic experiment for river closure of Three Gorges Project

长江三峡工程大江截流是三峡工程的关键技术之一。为顺利的进行大流量下的深水截流，并保证截流施工期长江正常通航，长江科学院在１∶１００、１∶８０和１∶４０的三个不同比尺的模型上进行了截流水力学试验研究。试验研究成果表明，三峡工程大江截流采用先平抛垫底后立堵的方案，可减少截流戗堤的坍塌现象与龙口段的工程量，有利于截流。

The main river closure is one of key techniques for the Three Gorges Project. In order that the river closure in deep water proceeds smoothly under large discharge and the normal navigation is guaranteed in the course of river closure, Changjiang Scientific Institute has conducted river closure model test with three different scales:1∶100, 1∶80,and 1∶40. The test results demonstrated that the construction scheme of padding river bed by horizontal dumping in advance, and then closing the gap by end dumping, will reduce the collapse phenomenon of pilot section and work quantity of gap closure, hence it is favourable.