构皮滩水电站通航建筑物第一级中间渠道布置与设计优化

Layout and design optimization of first intermediate channel of navigation construction of Goupitan Hydropower Station

构皮滩水电站通航建筑物是全线渠化乌江航道的重要环节,其中间渠道的布置关系到通航建筑物的通过能力、工程造价投资等诸多方面。为改善构皮滩水电站挡泄水建筑物占据了主河床,通航建筑物中间渠道的布置空间有限,且受到地形地质等多种边界条件制约,布置难度较大等问题,通过采用曲进直出方式过船、调整隧洞平面布置、调整错船段渡槽变宽方式、适当增加渠道断面系数等措施对构皮滩通航建筑物第一级中间渠道总体布置进行优化,有效改善了前期研究阶段总体布置方案结构尺度偏小、过船速度慢、影响通过能力等问题。研究提出的优化设计方案已成功应用到构皮滩水电站通航建筑物建设中,可为高山峡谷地区通航建筑物布置提供参考。

The navigation construction of Goupitan Hydropower Station is an important link in the channelization of the Wujiang waterway of the whole line,and the arrangement of the intermediate channel is related to the passing capacity of the navigation construction,the investment in engineering cost and many other aspects.Since the water holding and release structures of Goupitan Hydropower Station occupied the main riverbed,the layout space of the intermediate channels of navigation construction was limited,and it was restricted by various boundary conditions such as topography and geology,the arrangement of intermediate channels was difficult.By adopting the curved in and straight out mode to cross the ship,adjusting the layout of the tunnel and the widening method of the aqueduct in the ship stagger section,appropriately increasing the channel section coefficient and other measures,the overall layout of the first intermediate channel of the navigation construction in Goupitan Hydropower Station was optimized,which effectively improved the problems such as small structural scale,slow passing speed and impact on the transit capacity of the overall layout plan in the early stage of the study.This optimization design has been successfully applied to the construction of the navigation construction of the Goupitan Hydropower Station.The research results can provide a reference for the layout of navigation constructions in the alpine valley area.