池州长江公铁大桥3号主墩围堰冲刷防护模型试验研究  

Experimental study on scour protection model of No.3 main pier cofferdams for Chizhou Yangtze River Railway and Highway Bridge

作　　者：赵东梁 陈沿松 唐衡[1,3,4] ZHAO Dong-liang;CHEN Yan-song;TANG Heng(CCCC Second Harbor Engineering Co.,Ltd.,Wuhan,Hubei 430040,China;CCCCSHEC Fourth Engineering Co.,Ltd.Wuhu,Anhui 241000,China;Key Laboratory of Large-span Bridge Construction Technology,Wuhan,Hubei 430040,China;Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure,Wuhan,Hubei 430040,China)

机构地区：[1]中交第二航务工程局有限公司,湖北武汉430040 [2]中交二航局第四工程有限公司,安徽芜湖241000 [3]长大桥梁建设施工技术交通行业重点实验室,湖北武汉430040 [4]交通运输行业交通基础设施智能制造技术研发中心,湖北武汉430040

出　　处：《中国港湾建设》2025年第4期85-90,共6页China Harbour Engineering

摘　　要：针对池州长江公铁大桥3号主墩围堰下放过程的冲刷防护问题,以及因冲刷可能导致的施工风险,结合围堰下放施工工序,通过下放过程系列物理模型试验分析围堰刃脚距离泥面不同距离河床的最大冲刷深度及冲刷形态;考虑汛期水位流速与工程地质条件,分析围堰下沉到位后,围堰度汛抛石防冲的效果。局部冲刷坑在围堰下放前主要集中在前三排钢护筒两侧;围堰下沉到位后,围堰上游拐角处采取抛石防护措施可有效降低河床冲刷对围堰施工的影响,但要加强对围堰两侧平台桩的冲刷监测,防止局部桩基因冲刷过大倒塌。In response to the scour protection issues and potential construction risks that may arise from the lowering process of the No.3 main pier cofferdam of the Chizhou Yangtze River Highway and Railway Bridge,combined with the construction procedures of the cofferdam lowering,a series of physical model tests during the lowering process were conducted to analyze the maximum scour depth and scour morphology at different distances from the riverbed when the cofferdam blade foot is close to the riverbed surface.Considering the water level and velocity during the flood season,as well as engineering geological conditions,the effectiveness of riprap protection against scour after the cofferdam has been submerged in place was analyzed.Before the cofferdam is lowered,local scour pits are mainly concentrated on both sides of the first three rows of steel casings;after the cofferdam is submerged in place,riprap protection measures at the upstream corner of the cofferdam can effectively reduce the impact of riverbed scour on cofferdam construction,but it is necessary to strengthen the scour monitoring of the platform piles on both sides of the cofferdam to prevent the local pile foundation from collapsing due to excessive scour.

关 键 词：围堰施工 模型试验 冲刷深度 冲刷形态 抛石防护 

分 类 号：U615.5[交通运输工程—船舶及航道工程] U445[交通运输工程—船舶与海洋工程]