Abstract：Aiming at the difficulty of narrow space subway station construction and the long-term road blocking caused by open excavation in subway construction, a method of pipe jacking combined with large diameter shield tunneling was proposed. In view of the structural characteristics of abrupt drop in axial force of the unremoved segement in the construction, resulting in abrupt change in shear and flexural performance of adjacent longitudinal joints, a shell-contact calculation model based on load-structure model was proposed in this paper. This paper studies the mechanical properties of the whole structure in the two key processes of removing the segment and removing the internal support. The cooperative laws of lining segments, segment joints and internal support system during the tunnel opening were obtained, and the structural optimization direction was put forward accordingly. ①By adjusting the first longitudinal joint above the opening position away from the upper edge of the opening, the deformation of the opening lining ring and the bolt tension of the longitudinal joint could be sinnificantly reduced. ②It was suggested to construct the station midboard after removing the internal support and completing the connection between passage and shield tunnel. ③It was difficult to determine the actual connection between passage and shield tunnel lining, so it is suggested to adopt the rigid joint and hinged enveloping design. ④The structural mechanical responses could be effectively controlled by enhancing the integrity between openings lining rings.
柳献 郭振坤 伍鹏李 陈鸿. 通道开口对超大直径盾构法车站结构力学行为影响研究及结构优化[J]. 土木工程学报, 2021, 54(7): 114-122.
Liu Xian Guo Zhenkun Wu Pengli Chen Hong. Study on influence of passage opening on the mechanical behavior of super large diameter shield tunnel station structure and structural optimization. 土木工程学报, 2021, 54(7): 114-122.
