丘陵区连续多弯河段水利枢纽坝址选择

Selection of Dam Site for Continuous Multi-Bend Reach Hydro Project in Hilly Region

邕宁水利枢纽位于郁江干流邕江河段,为西江航运干线的重要工程,船闸规模大,通航水流条件要求高。邕江处于丘陵平原区,河道连续多弯,工程选址受地形及桥梁、河沿岸港口、铁路等工程设施限制,难度较大。依据工程任务要求,利用河流弯曲的特点,筛选河流迂回大拐弯、弯曲、微弯较顺直的3个坝址;从各枢纽布置、预留远期二线船闸位置、施工组织条件、沿河工程设施影响等因素进行分析比较,解决了坝址选择问题。通过挖掘弯曲河道凸岸台地的有利地形、地质条件,辅助工程措施,选获枢纽布置特色鲜明、经济可行的工程坝址。

Yongning Hydro Project is located in the Yongjiang reach of the main stream of the Yujiang River,which is an important project of the Xijiang River shipping line.The lock scale is large,and the navigation flow conditions are high.The Yongjiang River is located in the hilly and plain region,with continuous multi-bends reach.The site selection of the project is limited by the terrain,bridges,ports along the river,railways and other engineering facilities,which is difficult.According to the requirements of engineering tasks and the characteristics of river bend,three dam sites with relatively straight roundabout large bend,bend and slight bend are selected.The selection of dam site is solved by analyzing and comparing the layout of each hub,the position of the reserved long-term second-line lock,the construction organization conditions,and the influence of the engineering facilities along the river.By excavating the favorable terrain and geological conditions of the convex bank platform of the curved river and assisting engineering measures,the project dam site with distinctive layout characteristics and economic feasibility is selected.