汉江雅口航运枢纽施工纵向围堰对泄流能力影响研究

Impact of longitudinal cofferdam on discharge capacity of Yakou Shipping Hub in Han River

混凝土围堰结构稳定,占用河床面积小,抗冲效果好,广泛运用于枢纽分期导流施工组织设计中,但面临后期拆除困难,拆除废料难以清除及对周边建筑物影响大的特点。针对汉江雅口航运枢纽施工纵向围堰对泄流能力影响,采用CATIA软件进行三维数值模拟,在不同特征洪水流量下对纵向围堰保留与拆除方案进行流场、泄流能力和水位影响分析,为纵向围堰保留与拆除方案选取提供科学依据。结果表明:保留纵向围堰将会降低紧邻区域泄水闸闸孔的水流流速和泄流能力,一定程度增加河道中心壅水高度,但仍满足枢纽泄流能力控制标准要求,纵向围堰经安全稳定复核后可予以保留,为类似枢纽工程施工组织设计提供经验参考。

The concrete cofferdam structure is stable,occupies a small riverbed area,and has good anti erosion effect.It is widely used in the construction organization and design of hub stage diversion.However,it faces difficulties in later demolition,difficulty in removing demolition waste,and significant impact on surrounding buildings.This article focuses on the impact of longitudinal cofferdams construction on discharge capacity of the Yakou Shipping Hub in the Han River.CATIA software is used for three-dimensional numerical simulation,and flow field,discharge capacity,and water level effects are analyzed on the retention and removal plans of longitudinal cofferdams under different characteristic flood flows.This provides a scientific basis for the selection of retention and removal plans for longitudinal cofferdams.The results show that retaining the longitudinal cofferdam will reduce the water flow velocity and discharge capacity of the adjacent area's discharge gate hole,increase the height of the central blockage of the river to a certain extent,but still meet the requirements of the hub discharge capacity control standard.After safety and stability review,the longitudinal cofferdam can be retained,providing experience reference for the construction organization design of similar hub projects.