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为了选择适用于软土地区深埋排水盾构隧道管片接头结构形式,针对新型高承载力盾构隧道管片接头预埋件结构,开展了1∶1结构抗拉性能试验,研究管片接头预埋件在不同荷载工况下,锚筋的应力分布和传递、接头板的变形和位移、螺栓的应力分布、管片混凝土裂缝的分布扩展情况和结构最终破坏模式等力学特征。研究结果表明:锚筋应力随着与预埋件连接处距离的增加逐步减小,且传递曲线均呈现出先陡后缓的趋势;接头预埋件锚板和锚筋的存在,使得接头的整体刚度得到了增强,同时提高了结构的承载能力;结构最终破坏模式是接头预埋件与锚筋的连接位置发生断裂破坏,且结构破坏时预埋件整体有较大的翘曲变形,因此可以考虑提高预埋件与锚筋的连接性能并相应增加预埋件的刚度以进一步改善结构的整体性能。
In order to select the structure of tunnel joints for shield tunneling in deep drainage tunnels in soft soil areas, a 1: 1 structure tensile test was carried out to study the structure of the embedded parts of the new high-bearing shield tunnel segment joints. Under different loading conditions, the stress distribution and transmission of anchor bars, the deformation and displacement of joint plates, the stress distribution of bolts, the distribution and expansion of cracks in concrete segments and the ultimate failure mode of structures. The results show that the stress of anchorage tend to decrease gradually with the increase of the distance from the embedded part, and the transfer curve shows the trend of steep and slow; the existence of the anchor plate and anchor bars of the embedded part of the joint makes the overall The rigidity is enhanced and the bearing capacity of the structure is increased at the same time. The ultimate failure mode of the structure is the fracture damage of the connection position between the embedded part of the joint and the anchor bar, and the whole embedded part of the structure has larger warpage deformation when the structure is damaged, Consider increasing the connection between embedded parts and anchor bars and increasing the stiffness of the embedded parts accordingly to further improve the overall structural performance.