深水大流速条件下和畅洲水道潜锁坝损毁特征分析  

Damage characteristics of submerged closure dams in Hechangzhou Waterway under deep water conditions with high flow velocity

作　　者：盛艳丽 何国华 周贵国 SHENG Yanli;HE Guohua;ZHOU Guiguo(Changjiang Zhenjiang Waterway Division,Zhenjiang 212004,China)

机构地区：[1]长江镇江航道处,江苏镇江212004

出　　处：《水运工程》2023年第8期96-101,183,共7页Port & Waterway Engineering

摘　　要：航道整治工程中常使用潜锁坝来调节汊道分流比,一般由坝体和护底余排两部分组成,由于潜锁坝横跨深水大流速的汊道,对水流的调整作用明显,易引起河床局部剧烈冲刷,河床变化反作用于建筑物结构,导致局部变形甚至损毁。本文选取和畅洲水道左汊的两座潜锁坝为典型案例,采用实测资料结合水流模拟分析的方法,研究了建筑物实施后的效果以及建筑物发生变形的部位和局部损毁情况,探讨局部损毁的特征和原因。结果表明:坝体基本完整,变形主要发生在护底的余排边缘,排体损毁部位与建筑物附近冲刷较为剧烈的位置相对应,损毁原因主要有洪水期河道深槽主流冲刷、坝体变坡区下游水流紊乱淘刷和特殊水文年长时间洪水作用加速排体损毁3个方面。Submerged closure dams are often used in channel regulation projects to adjust the diversion ratio of branches,and the structure is generally composed of the dam body and the bottom protection mattress.Since the submerged closure dam crosses the branch of deep water with high flow velocity,it has an obvious regulating effect on water flow and can easily cause local violent scouring of the riverbed,and the changes in the riverbed react on the building structure,thus leading to local deformation and even damage.This paper selects two submerged closure dams in the left branch of Hechangzhou Waterway as a typical case and analyzes the effects of building implementation,as well as the deformation and local damage of the building by using measured data combined with water flow simulation analysis.Then,the paper discusses the characteristics and causes of local damage.The results show that the dam body is basically intact,and the deformation mainly occurs at the edge of the bottom protection mattress;the damaged area of the mattress corresponds to the location where the intense scouring occurs near the buildings.The main causes of damage are the mainstream scouring of the deep channel in the waterway during the flooding period,the turbulent scouring of the downstream water flow in the slope change area of the dam body,and the accelerated damage of the mattress during the long period of flooding in special hydrological years.

关 键 词：潜锁坝 深水大流速 损毁特征 

分 类 号：TV147[水利工程—水力学及河流动力学] U617[交通运输工程—船舶及航道工程]