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大跨度小净距明挖隧道叠合接头结构施工阶段力学性能研究
（重庆交通大学 山区桥梁及隧道工程国家重点实验室，重庆 400074）
Study on Mechanical Performance of Large-span and Small-clearance #br# Cut-and-Cover Tunnel with Composite Joint Structure during #br# Construction Stage
(State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University,
Chongqing 400074 )
Abstract：
Taking the Chongqing Xinsen Avenue cut-and-cover large-span prefabricated assembled tunnel project as the research background, a new type of assembled tunnel structure based on composite joints is proposed. A strata-structure numerical model is established, considering the influence of contact relationship, backfill hardening process, and compaction construction process. The mechanical behavior of a three-piece composite joint structure at the vault, a two-piece cast-in-place structure at the vault, and a traditional integral cast-in-place structure during the whole backfilling construction process is simulated and analyzed. The accuracy of the model is verified through comparison with field measurement data. The results show that during the backfilling stage, the composite joint structure exhibits superior deformation control capability, and the distribution of axial force and bending moment is more uniform. Compared with the two-piece structure and the integral cast-in-place structure, the vault settlement of the composite joint structure is reduced by 33% and 46%, respectively, and the peak bending moment is reduced by 82% and 40%, respectively. By optimizing stress distribution and enhancing overall stiffness, the composite joint effectively improves structural safety.
XU Zhanglong LIN Zhi GUO Xiande ZHANG Zhiming GOU Xiaoying LIU Lili DING Ming
.Study on Mechanical Performance of Large-span and Small-clearance #br# Cut-and-Cover Tunnel with Composite Joint Structure during #br# Construction Stage[J] MODERN TUNNELLING TECHNOLOGY, 2025,V62(5): 135-
2025, Vol. 62 