- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | ZHANG Weilie, YAN Qixiang, ZHANG Chuan, YANG Kai, JIA Ding. Cracking Behavior of Segmental Lining in Subways Under Adverse Jacking Force During Shield Tunneling[J]. Journal of Southwest Jiaotong University, 2023, 58(5): 1073-1082. doi: 10.3969/j.issn.0258-2724.20220235
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In order to guide the shield tunneling control and crack prevention design of segmental lining during the construction of subway section tunnels, a numerical model of the fabricated lining structure of shield tunnels considering joints and segments was established. Based on the constitutive model of concrete smeared cracking, the cracking behavior of linear segmental lining under the adverse jacking force caused by axial tilt and end face lateral displacement of the jack was studied. The research results show that under the above two kinds of adverse jacking force, the segmental lining cracks caused by the jacking force can be divided into bolt hole cracks in the key block, longitudinal cracks in hand holes, and longitudinal cracks in the annular surface of the segment. The crack width is the largest at the ring-direction bolt hole in the key block when the jack axis is tilted axially, and the width of the three types of cracks exceeds the construction limit when the axial inclination angle reaches 3°. The width is the largest at the annular surface of the lining and the ring-direction bolt hole in the key block when the end face of the jack laterally shifts. Specifically, the overall downward lateral displacement of the end face is the most unfavorable situation. The cracking of segmental lining will increase steel reinforcement stress at the crack location, and the relationship between steel reinforcement stress and crack width is not affected by the change of inclination angle of the jacking force. Furthermore, the crack width is positively correlated with the steel reinforcement stress. During shield construction, the adverse jacking force of shield tunneling should be strictly controlled. In order to control the occurrence of cracks, it is suggested to strengthen the reinforcement in the position where cracks are easy to occur.
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