高承载力盾构管片接头预埋件抗拉性能试验

发布时间：2018-06-14 21:15

本文选题：盾构隧道 + 抗拉性能　；参考：《中国公路学报》2017年08期

【摘要】：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。
[Abstract]:In order to select the segment joint structure suitable for deep buried drainage shield tunnel in soft soil area, a 1:1 tensile performance test was carried out for a new type of high bearing shield tunnel segment joint embedded piece structure. The stress distribution and transfer of anchor bars, the deformation and displacement of joint plates, the stress distribution of bolts, the distribution and propagation of cracks in segment concrete, and the ultimate failure mode of segment joints are studied under different load conditions. The results show that the stress of anchor bar decreases gradually with the increase of the distance between the anchor bar and the embedded member, and the transfer curves show a tendency of steepness first and then slow down, and the overall stiffness of the joint is enhanced by the existence of anchor plate and anchor bar. At the same time, the bearing capacity of the structure is improved, and the ultimate failure mode of the structure is that the connection position of the joint embedded piece and the anchor bar is broken, and the whole embedded piece has a large warping deformation when the structure is destroyed. Therefore, it can be considered to improve the connection performance of the embedded parts and anchor bars and increase the stiffness of the embedded parts accordingly to further improve the overall performance of the structure.
【作者单位】：同济大学土木工程学院;同济大学土木工程防灾国家重点实验室;上海市政工程设计研究总院(集团)有限公司;
【基金】：上海市科学技术委员会科研计划项目(16DZ1202200)
【分类号】：U455.43

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