淤积-潮汐耦合作用下沉管隧道接头变形特征研究  

Deformation characteristics of joints of immersed tube tunnels under coupling loads of back silting-tidal cycle

作　　者：周桓竹 喻莹 侯晋芳 俞缙[4] 王延宁 ZHOU Huanzhu;YU Ying;HOU Jinfang;YU Jin;WANG Yanning(Department of Civil and Environmental Engineering&Guangdong Engineering Center for Structure Safety and Health Monitoring,Shantou University,Shantou 515063,China;School of Civil Engineering,Wuhan University,Wuhan 430072,China;CCCC First Harbor Engineering Co.,LTD.,Tianjin 300461,China;Fujian Tunnel and Urban Underground Space Engineering Technology Research Center,Huaqiao University,Xiamen 361021,China;State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221008,China)

机构地区：[1]汕头大学土木与环境工程系广东省结构安全与监测工程技术中心,广东汕头515063 [2]武汉大学土木建筑工程学院,湖北武汉430072 [3]中交第一航务工程局有限公司,天津300461 [4]华侨大学福建省隧道与城市地下空间工程技术研究中心,福建厦门361021 [5]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008

出　　处：《岩土工程学报》2023年第9期1926-1933,共8页Chinese Journal of Geotechnical Engineering

基　　金：广东省自然科学基金项目(2022A1515011200);深部岩土力学与地下工程国家重点实验室开放课题(SKLGDUEK2005);广东省科技计划项目(STKJ2021129)。

摘　　要：重点研究了循环荷载耦合下沉管隧道接头的变形特征。通过建立管-土相互作用模型,将隧道简化为Timoshenko梁模型,将地基简化为Kerr地基模型,同时考虑基床系数随时间变化,建立管节-接头理论模型,分析接头处转角和挠度差。对比荷载叠加和荷载耦合两种不同加载方式下沉管隧道接头变形问题,讨论淤积荷载引发的结构变形在总变形中的贡献比例,以及适合分析运维期接头变形问题的理论解析方法。与ABAQUS数值计算结果进行比较,说明方法的适用性。以甬江沉管隧道实测数据对比分析表明:循环荷载耦合作用下对沉管隧道的动力响应影响显著,大于由单个荷载引起结构变形的叠加。淤积荷载引起的沉管结构变形占据耦合荷载导致变形的75%~125%,提出的理论模型可以很好地分析实测沉降结果,验证了提出理论模型的有效性。The proposed method focuses on the deformation characteristics of joints of immersed tube tunnels under cyclic load coupling.By establishing the tunnel-soil interaction model,the tunnel is simplified to the Timoshenko beam model,and the foundation is simplified to the Kerr foundation model.At the same time,considering the change of the subgrade coefficients with time,the theoretical model for the element-joint is established to analyze the transfer angle and deflection of the joints.By comparing the joint deformations of immersed tube tunnels under two different loading modes,namely load superposition and load coupling,the contribution proportion of structural deformation caused by back silting loads in the total deformation is discussed,and a theoretical analytical method suitable for analyzing the joint deformations during operation and maintenance is proposed.A comparison with the numerical results of ABAQUS demonstrates the applicability of the proposed method.By comparing with the measured data of Yongjiang immersed tube tunnel,it is shown that the dynamic response of the immersed tube tunnel is significantly affected by the cyclic load coupling,which is greater than the superposition of structural deformation caused by the single load.The deformation of immersed structure caused by the back silting loads accounts for 75%~125%of the deformation caused by the cyclic load coupling.The proposed theoretical model can well analyze the measured settlement results,which verifies the validity of the proposed theoretical model.

关 键 词：沉管隧道 荷载耦合 理论计算 软土地基 接头沉降 

分 类 号：TU43[建筑科学—岩土工程] U459.5[建筑科学—土工工程]