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Study on Model Test of Existing Shield Tunnel Uplift
(1. Shanghai Tunnel Engineering & Rail Transit Design and Research Institute, Shanghai 200235; 2. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060; 3. Key Laboratory of Coastal Urban Resilient Infrastructures(Shenzhen University), Ministry of Education, Shenzhen 518060)
Abstract Tunnel uplift correction is an effective way of controlling tunnel settlement, but uplift correction is likely to cause overconvergence and thus secondary damage of the tunnel. In light of this, an existing shield tunnel uplift model test system is designed. Separate longitudinal joints are installed to conduct longitudinal structure simulation,in order to examine how the longitudinal joints in the tunnel will reduce the integral stiffness. With comprehensive consideration of the influencing factors including uplift magnitude, uplift angle and stiffness of section, the variation pattern of vertical displacement and cross-section of the tunnel during uplift correction is investigated. As the results indicate: keeping an uplift angle less than 45° will prevent excessive deformation during tunnel uplift; when the uplift position is near the longitudinal joint of the tunnel, the displacement difference between the active uplift ring and the adjacent passive uplift ring will decrease, and the longitudinal displacement curve of the tunnel be- comes gentle; installation of internal support will cause the uplift model to change from section deformation to global uplift.
Abstract：
Tunnel uplift correction is an effective way of controlling tunnel settlement, but uplift correction is likely to cause overconvergence and thus secondary damage of the tunnel. In light of this, an existing shield tunnel uplift model test system is designed. Separate longitudinal joints are installed to conduct longitudinal structure simulation,in order to examine how the longitudinal joints in the tunnel will reduce the integral stiffness. With comprehensive consideration of the influencing factors including uplift magnitude, uplift angle and stiffness of section, the variation pattern of vertical displacement and cross-section of the tunnel during uplift correction is investigated. As the results indicate: keeping an uplift angle less than 45° will prevent excessive deformation during tunnel uplift; when the uplift position is near the longitudinal joint of the tunnel, the displacement difference between the active uplift ring and the adjacent passive uplift ring will decrease, and the longitudinal displacement curve of the tunnel be- comes gentle; installation of internal support will cause the uplift model to change from section deformation to global uplift.
ZENG Yi1 GAO Yue2,
3 WU Peilin2,
3 ZHANG Xiaolong1 FU Yanbin2 etc
.Study on Model Test of Existing Shield Tunnel Uplift[J] MODERN TUNNELLING TECHNOLOGY, 2024,V61(1): 200-207
2024, Vol. 61 