Local prototype failure test on staggered assembled segmental lining for shield tunnel
Qiu Yue1 Feng Kun1,2 He Chuan1 Su Ang1 Liang Kun1
1. Key Laboratory of Transportation Tunnel Engineering of the Ministry of Education, Southwest Jiaotong University,Chengdu 610031, China;
2. China-Japan RSC Structure Research Center, Southwest Jiaotong University, Chengdu 610031, China
Abstract：In order to investigate the local failure characteristics of segmental lining for shield tunnel and quantitatively evaluate the safety state of the structure, a local prototype test was carried out on a staggered assembled segmental lining. The relationships between crack development, stress distribution and bolt internal force to structural internal force and deformation, joint opening and dislocation were described in detail. The failure mechanism of the structure was thus analyzed and the test results were verified by the numerical calculated ones. The results show that the initial crack in the structure appears at the middle ring close to the longitudinal joint of the adjacent ring, and develops into the main crack at final damage. The compression-flexure failure occurs in the middle of the structure and the compressive shear failure occurs at both ends of the structure when the axial compression ratio of control section remains constant and bending moment increases. There is no damage to the joints, the joint opening is smaller but the dislocation is larger. The stress concentrations near the hand hole are serious. The failure mechanism is found to be caused by cracking in the region where the stiffness is relatively larger. In addition, the cracking results in the redistribution of the overall stiffness of the structure, and subsequently the region with the greatest stiffness continues to crack, repeating the cycle until the structure is damaged with excessive deformation. Moreover, the crack width, joint dislocation and vertical displacement of control section can be taken as the evaluation indexes of structural safety.
邱月 封坤 何川 苏昂 梁坤. 盾构隧道错缝拼装管片衬砌局部原型结构破坏试验[J]. 土木工程学报, 2019, 52(4): 98-108.
Qiu Yue Feng Kun He Chuan Su Ang Liang Kun. Local prototype failure test on staggered assembled segmental lining for shield tunnel. 土木工程学报, 2019, 52(4): 98-108.
