2D numerical investigation of segmental tunnel lining behavior |
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| Affiliation: | 1. University of Lyon, INSA of Lyon, Laboratory L.G.C.I.E., Villeurbanne, France;2. University of Joseph-Fourier, Laboratory L.T.H.E., Grenoble, France;3. Politecnico of Turin, Department of L.E.G.E., Italy;1. Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK;2. Department of Geotechnical Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China;4. Structure Technology Division, Japan Railway Technical Research Institute, 2-8-38 Hikaricho, Kokubunji, Tokyo 100-0005, Japan;1. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China;2. Department of Geotechnical Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China;3. Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, 1239 Siping Road, Shanghai 200092, China;1. Department of Structures and Materials, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Circuito Escolar S/N, E2, Ciudad Universitaria, 04510 México D.F., Mexico;2. Department of Construction Engineering, Universitat Politècnica de Catalunya (UPC), Jordi Girona 1-3, C1, 08034 Barcelona, Spain;1. Faculty of Civil Engineering, University of Tabriz, Iran;2. Faculty of Engineering, Azarbaijan Shahid Madani University, Iran;3. Department of Mining Engineering, Sahand University of Technology, Tabriz, Iran;1. Department of Geotechnical Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China;2. Department of Geotechnical Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China;3. Shanghai Municipal Engineering Design Institute (Group), CO., LTD., 901 North Zhongshan 2nd Road, Shanghai 200092, PR China;4. Jinan Rail Transit Group CO. LTD., 2000 Shunhua Road, Jinan, Shandong 250101, PR China |
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| Abstract: | The application field of shield tunneling has extended in recent years. Most shield-driven tunnels are supported by segmental concrete linings. Although many well documented experimental, numerical and analytical results exist in literature concerning the functioning of segmental tunnel linings, their behavior under the influence of joints is still not clear.This paper presents a numerical study that has been performed to investigate the factors that affect segmental tunnel lining behavior. Analyses have been carried out using a two-dimensional finite difference element model. The longitudinal joint between segments in a ring has been simulated through double node connections, with six degrees of freedom, represented by six springs. The proposed model allows the effect of not only the rotational stiffness but also the radial stiffness and the axial stiffness of the longitudinal joints to be taken into consideration. The numerical results show a significant reduction in the bending moment induced in the tunnel lining as the joint number increases. The tunnel behavior in terms of the bending moment considering the effect of joint distribution, when the lateral earth pressure factor K0 is equal to 0.5, 1.5 and 2, is almost similar and differs when K0 is equal to unity. It has been seen that the influence of joint rotational stiffness, the reduction in joint rotation stiffness under the negative bending moment, the lateral earth pressure factor and Young’s modulus of ground surrounding the tunnel should not be neglected. On the other hand, the results have also shown an insignificant influence of the axial and radial stiffness of the joints on segmental tunnel lining behavior. |
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| Keywords: | Shield-driven tunnel Segmental lining Lining force Displacement Joint stiffness Numerical model |
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