三峡工程大江截流问题试验研究

Investigation into TGPs Closure Problems

通过三个不同比尺（４０，８０，１００）模型对三峡大江截流过程进行了水力学试验研究。内容包括：不同方案的通航水流条件；龙口水力学；戗堤坍塌试验与防护措施；平抛垫底渡汛及对通航的影响。重点介绍了未平抛垫底与平抛垫底两个方案的研究成果。结果表明，后者效果显著，是减少戗堤坍塌的有效方法。

The hydraulics tests relating to the main channel closure have been carried out on 1∶40, 1∶80 and 1∶100 three scale models. Study contents include: navigation conditions in the defferent schemes, hydraulics problems in the closure gap, slumping of dumped banquette and its prevention measures, flood release through closure gap and scour protection of predumped sand gravels on river bed as well as its influence on navigation. This paper mainly introduces the test results concerning the end dumping closure method under two different bottom conditions (one is the original river bed and the other is a bedding course filled up by the mixture of sands and stones). The results show that, compared with the former, the effect of the latter is obvious, so it is an available method to reduce slumping.