临长江大堤超深基坑快速取土施工技术  

Rapid Soil Excavation Construction Technology for Ultra Deep Foundation Pit Near the Yangtze River Embankment

作　　者：邹端 ZOU Duan(China Railway Bridge Group Fourth Engineering Co.,Ltd.,Nanjing,Jiangsu 210031,China)

机构地区：[1]中铁大桥局集团第四工程有限公司,江苏南京210031

出　　处：《黑龙江交通科技》2025年第4期39-43,共5页Communications Science and Technology Heilongjiang

摘　　要：深基坑开挖将对周边范围内的构筑物和土体产生影响,当锚碇深基坑毗邻长江大堤,在长江水位作用下,基坑需在超高水压作用下取土施工;超深基坑取土深度与长江水位降幅匹配,并在对应的枯水期开挖至坑底,确保基坑取土及大堤结构安全。以G3铜陵长江公铁大桥江北侧锚碇超深基坑工程为背景,通过改变传统取土工艺、调整出土方法、优化内衬分段等措施,使各施工工序无缝衔接,将基坑取土深度与长江水位下降速度匹配,在长江水位最低点时完成超深基坑取土。整个超深基坑共15层、取土13万m^(3),用时127 d,平均8.5 d/层。采用数字化监测手段对超深基坑取土进行全过程监控量测,基坑、长江大堤变形均满足限值要求。The excavation of deep foundation pits will have an impact on the surrounding structures and soil.When the anchor deep foundation pit is adjacent to the Yangtze River embankment,under the action of the Yangtze River water level,the foundation pit needs to be excavated and constructed under the action of ultra-high water pressure;The soil excavation depth of the ultra deep foundation pit matches the drop in the Yangtze River water level,and is excavated to the bottom of the pit during the corresponding dry season to ensure the safety of soil excavation and embankment structure.Against the backdrop of the G3 Tongling Yangtze River Public Railway Bridge’s ultra deep foundation pit project on the north side of the river,measures were taken to seamlessly connect various construction processes by changing traditional soil extraction techniques,adjusting excavation methods,and optimizing lining segmentation.The soil extraction depth of the foundation pit was matched with the rate of water level drop in the Yangtze River,and the ultra deep foundation pit was completed at the lowest point of the Yangtze River water level.The entire ultra deep foundation pit consists of 15 layers,with 130000 m^(3) of soil taken,and takes 127 days,with an average of 8.5 days per layer.Using digital monitoring methods to monitor and measure the entire process of soil excavation in ultra deep foundation pits,the deformation of the foundation pit and the Yangtze River generally meets the limit requirements.

关 键 词：悬索桥 锚碇 深基坑 超高水压 快速化取土 监测 

分 类 号：U445[建筑科学—桥梁与隧道工程]