摘要
鉴于长江南京河段八卦洲右缘深槽水深大、流速大、流态复杂、水流紊乱等特点,在八卦洲右缘深槽防护工程施工前开展了袋装砂抛枕现场试验,对袋装砂抛枕防护施工参数、施工流程及质量控制措施进行研究,提出了一种针对深槽防护工程的袋装砂抛枕防护施工技术。试验结果表明:在水下每隔120 m筑一道约5 m高的丁坝来改变水流流态,可有效解决八卦洲右缘水流紊乱处正常抛投成型率低的问题。工程施工完工后八卦洲水下岸坡冲刷明显减缓,控制八卦洲汊道现有河势的洲头及右汊内几处关键节点的稳定性大幅提高,并经历了2020年长江南京河段超历史洪水检验。相关经验可供类似深槽防护工程参考借鉴。
In view of the characteristics of large water depth,high flow velocity,complex flow pattern and disordered flow in the deep groove on the right edge of Bagua bottomland in Nanjing reach of Changjiang River,the field test of bagged sand throwing pillow was carried out before the construction of deep groove protection project.The construction parameters,construction process and quality control measures of bagged sand throwing pillow protection were studied,and a bagged sand throwing pillow protection construction technology for deep groove protection project was proposed.The test results showed that building a spur dike of about 5m high every 120m underwater to change the flow pattern can effectively solve the problem of low normal throwing molding rate at the right edge of the Bagua bottomland.After the completion of this project,the erosion of the underwater bank slope of Bagua bottomland was obviously slowed down,and the stability of several key nodes and sandbar heads of the Bagua bottomland was greatly improved.It has experienced the inspection of the ultra-historical flood in the Nanjing reach of Changjiang River in 2020,and the relevant experience can be used for reference in similar deep groove protection projects.
作者
邓传贵
甘磊
庄雪飞
DENG Chuangui;GAN Lei;ZHUANG Xuefei(Nanjing Water Planning and Designing Institute Co.,Ltd.,Nanjing 210000,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;Nanjing Water Project Quality Safety Supervision Office,Nanjing 210013,China)
出处
《人民长江》
北大核心
2021年第11期150-154,174,共6页
Yangtze River
基金
江苏省自然科学基金项目(BK20201312)
水利部堤防安全与病害防治工程技术研究中心开放基金项目(DFZX2020003)。
关键词
河道整治
袋装砂
抛枕防护
复杂流态
水下施工
八封洲
长江南京河段
river regulation
bagged sand
throwing pillow protection
complex flow pattern
underwater construction
Bagua bottomland
Nanjing reach of Changjiang River
