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为了更全面地了解地基沉降对沉管隧道节段接头剪力键力学性能影响情况,以港珠澳沉管隧道工程为背景,系统开展了两种不同沉降工况下几何相似比为1∶4.69的大型模型试验,并利用有限元对实际沉管节段进行数值模拟,研究了地基沉降下节段接头剪力键力学性状和剪力的分布情况。试验结果表明:剪力键应力变化主要影响因素为地基沉降,接头内剪力键的空间组合对应力影响不明显;地基沉降过程中,水平剪力键应力值相对较小;中墙剪力键下部端角先于侧墙剪力键下部端角与剪力键槽挤压,且前者量值大于后者,中墙剪力键下部端角最先受压破坏;接头内剪力键根部剪力分布与剪力键布设方向关系紧密,节段横断面一侧地基下沉对另一侧节段产生横拉效应;同时提出了接头内最大剪力与地基沉降关系方程和各竖向剪力键的竖向剪力承担比例。
In order to understand more about the influence of foundation settlement on the mechanical properties of shear bond of immersed tunnel joints, taking the Hong Kong-Zhuhai-Macao tunnel project as a background, the geometric similarity ratio of two different settlement conditions is 1: 4.69 The numerical simulation of the actual immersed tube segments with finite element method is carried out to study the distribution of the mechanical properties and the shear force of the shear bonds in the segment joints under the foundation settlement. The test results show that the main factors that affect the shear stress are ground settlement, and the spatial combination of the shear bond in the joint has no obvious effect on the stress. During the foundation settlement, the horizontal shear stress is relatively small. The lower corner angle is lower than the lower corner angle of the side wall shear force key and the shear keyway, and the former value is greater than the latter. The lower corner angle of the middle wall shear force key is the first to be crushed and damaged; The distribution is closely related to the direction of the shear bond arrangement. The subsidence of the foundation on one side of the section results in a horizontal pull effect on the other side section. At the same time, the relationship between the maximum shear force in the joint and the foundation settlement and the vertical shear force The vertical shear load ratio.