沉管隧道新型剪力杆组合结构的抗剪应用研究
Research on Shear Application of New Shear Rod Combined Structure of Immersed Tunnel
叶亮 1陈鸿 2禹海涛 3陈正杰 2张巍 4张乐乐5
作者信息
- 1. 广州地铁设计研究院股份有限公司,广东广州 510010
- 2. 上海市隧道工程轨道交通设计研究院,上海 200235
- 3. 同济大学地下建筑与工程系,上海 200092;同济大学岩土及地下工程教育部重点实验室,上海 200092
- 4. 碧桂园控股有限公司,广东佛山 528312
- 5. 上海市政工程设计研究总院(集团)有限公司,上海 200082
- 折叠
摘要
为了提高节段接头施工效率和沉管隧道预制化水平,改善现有节段接头连接方案存在的接头截面利用率低、中埋式止水带安装困难、工效低和剪力键浇筑质量差等突出问题,提出以新型钢剪力杆组合结构替代传统剪力键的节段接头连接方案.通过开展剪力杆组合结构单杆、多杆剪切试验,测量剪切荷载、接头相对错动、钢套筒应变和钢筋应力,研究其抗剪性能.以大连湾海底沉管隧道工程为依托,基于材料塑性损伤本构模型,考虑节段接头的细部构造,根据剪力杆组合结构剪切试验对数值仿真方法的有效性进行验证.利用数值模拟研究了节段接头水平向、竖直向剪切,绕横轴、竖轴弯曲的变形规律和破坏特征,进一步建立三维仿真模型,研究剪力杆组合结构在大连湾海底沉管隧道工程中的工作情况.研究结果表明:剪力杆组合结构的失效由剪力杆的剪断破坏控制,破坏延性特征明显.剪力杆破坏荷载-位移关系可以分为弹性、塑性加强和塑性破坏3个阶段.接头存在间隙时,剪力杆组合结构破坏屈服特征明显.剪切试验数值结果与现场试验结果吻合良好.节段接头数值试验揭示,在剪切、弯曲作用下接头破坏过程较为复杂,且均呈现出阶段性特征.基于接头损伤分析,提出了节段接头位移安全评价指标.对控制工况下的三维全长数值模型的节段接头计算位移指标进行安全评价,评价结果显示,剪力杆组合结构适用于大连湾海底沉管隧道工程并具有良好的经济性.
Abstract
In order to improve the construction efficiency of segmental joints and the prefabrication level of immersed tunnels,and to solve the problems in existing segmental joint connection schemes,such as low utilization rate of joint sections,installation difficulties of buried waterstops,low work efficiency and poor pouring quality of shear keys,etc.,a new type of steel shear rod composite structure is proposed to replace the traditional shear key in segment joints.By carrying out single-bar and multi-bar shear experiments of the shear rod composite structure,the shear load,the relative displacement of the joint,the strain of the steel sleeve and the stress of the steel bar are measured,and the shear resistance of the shear rod is studied.Relying on the Dalian Bay submarine immersed tunnel,based on the material plastic damage constitutive model,considering the detailed structure of the segment joints,the effectiveness of the numerical simulation method is verified according to the shear experiment of the shear rod composite structure.The deformation law and failure characteristics of the horizontal and vertical shearing,bending around the horizontal and vertical axes of the segment joints were studied by numerical simulation,and a three-dimensional simulation model was further established to study the working conditions of the shear rod composite structure in Dalian Bay submarine immersed tunnel.The research shows that the failure of the shear rod composite structure is controlled by the shear failure of the shear rod,and the failure ductility characteristics are obvious.The failure load-displacement relationship of shear rods can be divided into three stages:elasticity,plastic strengthening and plastic failure.When there is a gap in the joint,the failure yield characteristics of the shear rod composite structure are obvious.The numerical results of the shear test are in good agreement with the field experimental results.Numerical experiments of segmental joints reveal that the failure process of joints under shearing and bending is complex,and all of them exhibit staged characteristics.Based on the joint damage analysis,a safety evaluation index of segmental joint displacement is proposed.The safety evaluation of the displacement index of the segment joints of the three-dimensional full-length numerical model under the control conditions is carried out.The evaluation results show that the shear rod composite structure is suitable for the Dalian Bay submarine immersed tunnel project and has good economy.
关键词
隧道工程/沉管隧道/剪切试验/抗剪性能/剪力杆/节段接头/剪力键Key words
tunnel engineering/immersed tunnel/shear tests/shear resistance performance/shear rod/segment joint/shear key引用本文复制引用
出版年
2024
NETL
NSTL
万方数据