黏土中隔舱吸力式钢圆筒安装及水平受荷试验研究  

Model tests on installation and horizontal bearing capacity of compartment suction steel cylinder in clay

作　　者：郭伟[1,2,3] 王吉轩[1] 任宇晓 张龙 GUO Wei;WANG Jixuan;REN Yuxiao;ZHANG Long(School of Civil Engineering,Tianjin University,Tianjin 300072,China;State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation,Tianjin University,Tianjin 300350,China;Key Laboratory of Coast Civil Structure Safety of the Ministry of Education,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津大学水利工程智能建设与运维全国重点实验室,天津300350 [3]天津大学滨海土木工程结构与安全教育部重点实验室,天津300350

出　　处：《海洋工程》2023年第6期65-75,共11页The Ocean Engineering

基　　金：国家自然科学基金资助项目(52108335,51878446,52171273);天津市科技计划资助项目(20JCJQJC00220);中国国家留学基金资助项目(202106250147)。

摘　　要：近年来大直径钢圆筒结构在离岸人工岛工程中得到应用,如港珠澳大桥人工岛即采用振动下沉的方式安装钢圆筒,该方法对施工条件、装备以及施工控制技术要求较高。提出一种新型隔舱吸力式钢圆筒结构,在钢圆筒内部设置隔舱板,将结构分为上下两个隔舱,通过对下舱抽气实现隔舱吸力式钢圆筒在负压作用下的下沉安装。设计了隔舱吸力式钢圆筒安装及水平承载力模型试验,对比了负压贯入的隔舱吸力式钢圆筒和压力贯入的传统钢圆筒结构的贯入阻力及承载特性,分析了改变隔舱吸力式钢圆筒上下舱高度比L1/L2对其沉贯过程及承载特性的影响。结果表明,采用负压吸力沉贯的隔舱吸力式钢圆筒相比于采用压力贯入的传统钢圆筒结构的贯入阻力减小,水平极限承载力提高。在极限水平荷载作用下,随着隔舱吸力式钢圆筒的L1/L2从2.28减小到1.00、0.56,转动中心位置上移,水平极限承载力及弯矩承载力得到显著提高。In recent years,large-diameter steel cylinder structure has been widely used in offshore artificial island projects.For example,the artificial island of Hong Kong-Zhuhai-Macao Bridge adopts the vibration sinking method to install steel cylinder.This method has strict requirements for construction conditions,equipment and control technology.A novel type of suction steel cylinder with compartments was proposed in this research.A partition plate was arranged inside the steel cylinder,dividing the structure into upper and lower compartments.By pumping air to the lower compartment,the compartment suction steel cylinder can be installed with negative pressure.The installation and horizontal bearing capacity model tests of the compartment suction steel cylinder were designed,the penetration resistance and bearing characteristics of the compartment suction steel cylinder with negative pressure penetration and the traditional steel cylinder with pressure penetration were compared,and the influence of changing the upper and lower compartment height ratio L1/L2 on the penetration process and bearing characteristics of the compartment suction steel cylinder was analyzed.The results show that compared with the traditional steel cylinder structure with pressure penetration,the penetration resistance of the compartment suction cylinder with negative pressure penetration is decreased,and the horizontal ultimate bearing capacity is increased.Under the ultimate horizontal load,as the L1/L2 of the compartment suction steel cylinder decreases from 2.28 to 1.00 and 0.56,the rotation center moves upward,and the ultimate bearing capacity and bending moment significantly increase.

关 键 词：吸力式沉箱 隔舱板 贯入阻力 水平承载力 大直径圆筒 人工岛 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]