Abstract: According to the natural condition,Tu'naozi shoal don't have obvious influence on the boat's sailing,for it only silts in the floodwater;when the water is low,the shoal is washed out.However,when Three Gorges Project runs the scheme of 139 m water level,the problem of the accumulative deposition becomes more and more severe,for the sediment situates the end of the reservoir and the sediment deposited at high-water period can't be washed out completely.Firstly,the dangerous condition of the shoal and the process of the treatment during last three years are introduced.Secondly,through the analysis of shoal evolvement rules in the cases of natural condition and the sluice of Three Gorges Project as well as the shoal's mechanism of baffling sailing,the techniques about engineering maintenance measurement,construction and the choice of construction time are explored.The conclusion offers some reference to the treatment of the similar shoals at the end of the reservoir and the shoals at the 175 m water level.

Key words: waterway treatment, Three Gorges Project, Tu'naozi Shoal, shoal characteristics

摘要： 土脑子滩天然条件下洪淤枯冲,对行船影响不大。三峡水库139 m蓄水后,滩段位于库尾,由于汛期淤沙得不到足够冲刷而出浅碍航。在对土脑子滩的滩险情况和经139 m蓄水期共3期疏浚治理过程介绍的基础上,通过研究分析滩段天然情况下和三峡蓄水后的演变规律及碍航机理,对工程维护措施、施工技术、施工时机的选择等技术进行了探究,这对库尾类似滩段,以及三峡下阶段175 m蓄水期库尾类似滩险的治理提供了一定的借鉴。

关键词: 航道整治, 三峡工程, 土脑子滩, 滩性