Experimental study on mechanical behavior of splicing joints of shield tunnel lining subjected to fire
Guo Zhen1,2 Song Jun1 Liu Yi1 Wang Xiangren1 Liu Yibo1 Ma Chuang1 Li Fumin1,2
1. School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China；
2. Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology, Xuzhou 221116, China
Abstract：Shield tunnel segment joints are the weak parts of the tunnel structure, so it is particularly important to study its performances, especially fire-resistance performance. The fire-resistance tests were conducted on the lining structure joints with installation errors. The mechanical properties and damage laws of the joints of the shield tunnel lining structure under the fire were studied. The apparent characteristics, temperature field distribution, structural properties and mechanical properties of the post-disaster segment were analyzed. The results show that the lining segment without initial defects has a large burst area and shallow depth, while the lining segment with initial defects has a large peeling depth. The maximum peeling depth of lining segments with initial defects is 72 mm, and the joint damage rate is 10.52%. The lining segment with initial defects has larger residual deformation after cooling. The bending moment of the lining segment with initial defects changes faster under the action of fire. The bending and shear resistance are mainly manifested by the increase in the joint opening angle and the amount of expansion, and the joint part has further misalignment phenomenon. The stiffness of the segment joints with initial defects decays faster and the stiffness loss is greater than those without initial defects. The remaining stiffness after fire decreases about 69.7%. The research results can provide reference for the thermal-mechanical coupling study of shield tunnel lining splicing joint structure.
郭震 宋隽 刘毅 王香仁 刘毅波 马闯 李富民. 火灾下盾构隧道衬砌拼接接头力学行为试验研究[J]. 土木工程学报, 2022, 55(3): 94-104.
Guo Zhen Song Jun Liu Yi Wang Xiangren Liu Yibo Ma Chuang Li Fumin. Experimental study on mechanical behavior of splicing joints of shield tunnel lining subjected to fire. 土木工程学报, 2022, 55(3): 94-104.
