沉管隧道轴线干坞深基坑支护结构设计方案比选研究  

Study on Scheme Selection of Supporting Structure Design for Deep Foundation Excavation of Dry Dock on Immersed Tunnel Axis

作　　者：曾波存 潘传宗 任耀谱 周兴涛 ZENG Bocun;PAN Chuanzong;REN Yaopu;ZHOU Xingtao(CCCC Second Harbour Engineering Co.,Ltd.,Wuhan,Hubei 430040,China;CCCC Highway Consultants Co.,Ltd.,Beijing 100088,China;School of Civil Engineering and Architecture,Hubei University of Arts and Science,Xiangyang,Hubei 441053,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]中交公路规划设计院有限公司,北京100088 [3]湖北文理学院土木工程与建筑学院,湖北襄阳441053

出　　处：《施工技术（中英文）》2023年第13期42-48,共7页Construction Technology

基　　金：中国交通建设股份有限公司科技研发项目(2018-ZJKJ-17)。

摘　　要：以襄阳汉江鱼梁洲沉管隧道西汊干坞基坑为背景,采用数值模拟法,并考虑现场地质条件,对内河沉管隧道干坞深基坑支护设计方案进行比选研究,研究表明:放坡开挖+锚索地下连续墙+落底式止水墙组合方案的围护结构弯矩与水平位移最小,锚索地下连续墙+封底混凝土组合方案对周边地层的变形控制效应强于锚拉双地下连续墙+封底混凝土组合方案。当干坞基坑下部存在稳定连续的相对隔水层时,放坡开挖+锚索地下连续墙+落底式止水素混凝土止水墙组合方案为最优设计。提出分区设计的思路,西侧半区采用放坡开挖+锚索地下连续墙+落底式止水素混凝土止水墙作为最优设计方案,东侧半区采用放坡开挖+锚索地下连续墙+封底混凝土作为最优设计方案。Based on the foundation excavation of the dry dock of the west branch of the Yuliangzhou immersed tunnel of the Hanjiang River in Xiangyang City of Hubei Province,the numerical simulation method is adopted to compare and select the design schemes of the deep foundation excavation of the dry dock of the inland river immersed tunnel,taking into account the geological conditions.The results show that the combination of slope excavation+anchor cable underground continuous wall+bottom-falling sealing wall has the smallest bending moment and horizontal deformation of the retaining structure.The deformation control effect of the anchor cable underground continuous wall+bottom sealing concrete combination scheme on the surrounding strata is stronger than that of the anchor pull double underground continuous wall+bottom sealing concrete combination scheme.When there is a stable and continuous relative water-resisting layer in the lower part of the dry dock foundation excavation,the combination scheme of slope excavation+anchor cable underground continuous wall+bottom-falling water-stop plain concrete water-stop wall is the optimal design.The idea of zoning design is proposed.The western half of the dry dock foundation excavation adopts the optimal design scheme of slope excavation+anchor cable underground continuous wall+bottom-falling water-stop plain concrete water-stop wall,and the eastern half adopts the optimal design scheme of slope excavation+anchor cable underground continuous wall+bottom sealing concrete.

关 键 词：沉管隧道 轴线干坞 深基坑 支护 设计 

分 类 号：TU758.11[建筑科学—建筑技术科学]