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| Improvement of the overall mechanical behavior of shield tunnel by FRCM strengthening the segment joints |
| MA Chao1, QIAO Fayu1, WANG Guosheng2*, LIANG Jingyu1, LU Dechun2
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1. School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 102616, China;
2. College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China |
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Abstract The improvement effect of fiber reinforced cementitious matrix(FRCM)on the bearing and deformation performance of shield tunnels was investigated in this paper. The FRCM, which consisted of engineered cementitious composites(ECC)with internal polyvinyl alcohol(PVA)fibers and basalt fiber-reinforced polymer(BFRP)grids, was adopted to strengthen the segment joints of shield tunnels. Based on the test results of the full-scale bearing capacity model of shield tunnels, the rationality of the three-dimensional(3D)finite element analysis model for shield tunnels was verified from the perspectives of the failure modes and load-deformation curves. The improvement of FRCM on the overall bearing performance of the tunnel was first analyzed using the developed 3D elastoplastic constitutive model of PVA-ECC by the authors. The influence of sensitive parameters, including the strengthened location, strengthened area, number of fiber mesh layers, and thickness of the ECC, on the improvement of the load-carrying capacity was clarified from the perspectives of damage mode, overall structural deformation, and joint opening. Furthermore, the optimal parameters of FRCM for strengthening the shield tunnel segments were determined by comprehensively considering the tunnel damage, load-carrying capacity, and economic considerations. The findings from this study are of great significance for improving the load-carrying capacity of shield tunnels by using FRCM.
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Published: 23 March 2026
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