METHOD FOR DETERMINING BENDING STIFFNESS OF SHIELD TUNNEL SEGMENT RINGS LONGITUDINAL JOINT BASED ON FIX-POINT ITERATION
XIA Caichu1，2，ZENG Gehua1，BIAN Yuewei1
(1. Department of Geotechnical Engineering，School of Civil Engineering，Tongji University，Shanghai 200092，China；2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China)
Abstract：The deformation of the longitudinal joint with a complex structure in shield tunnel is closely related to its internal force and highly nonlinear under eccentric compression. A reasonable value of the bending stiffness of joint is vital for the design of the segment ring of shield tunnels with the beam-spring model. The analytical formulas of calculating the deformations at different deforming modes based on the existed model were presented for the double-padded longitudinal joints under a constant axial force. The angles of rotations measured in the joint bending tests were compared with the calculated results with a good agreement. A non-linear equation system for the joints stiffness was derived considering the stiffness difference between the joints and the segment and using the formulas for the internal force of the segment ring and the one for different deformation modes of the joints. The non-linear equation system was solved with the fix-point iteration programme utilizing the software Maple. Reasonable stiffness values of the joints were obtained after several trial calculations with the iteration programme.
陈三江. 盾构法隧道衬砌接头受力机理分析[硕士学位论文][D]. 上海：同济大学，1985.(CHEN Sanjiang. The analysis of the joint mechanism of shield-driven tunnel lining[M. S. Thesis][D]. Shanghai：Tongji University，1985.(in Chinese))
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2014, Vol. 33 
