Abstract：It has been widely accepted that the deformation and failure mechanism of segmental tunnel linings are governed by the behavior of joints. However, it was still not clear yet how the local behaviors of joints affect the overall behavior of segmental tunnel linings. In order to investigate the overall behavior of segmental linings with different types of joints, five groups of full-scale tests were carried out. Three types of longitudinal joints were considered, including joints connected with straight bolts, joints connected with bent bolts and joints connected with fast-slide connector, respectively. Two types of circumferential joints were considered, including joints with tongue-and-groove structure and plate joints. The progressive failure and ultimate bearing capacity of segmental linings assembled with both single ring and triple-ring system were captured under the designed loading situation. The results indicated that: (1) The failure mode of cross-jointed segmental tunnel linings depends on the ductility of joints. After the ductility of the longitudinal joint connector is improved, the failure mode of structure may transit from the brittle failure of joint connector to the overall instability failure of structure. (2) Failure of the stagger-jointed segmental tunnel linings depends on the interaction between rings. With the increase of the interaction between rings, the first plastic hinge tends to develop in the segments rather than in the longitudinal joint connectors. (3) The performance of segmental linings may be improved by adjusting the stagger effect through the coordinated designs of the single ring stiffness and the circumferential joint shear stiffness.
柳献 张雨蒙 王如路. 地铁盾构隧道衬砌结构变形及破坏探讨[J]. 土木工程学报, 2020, 53(5): 118-128.
Liu Xian Zhang Yumeng Wang Rulu. Discussion on deformation and failure of segmental metro tunnel linings. 土木工程学报, 2020, 53(5): 118-128.
