Longitudinal rigidity of shield tunnel considering deformation characteristic and joints characteristic of lining
YANG Chun-shan1, WEI Li-xin1, MO Hai-hong2, HE Ze-gan1
1. Guangzhou Municipal Engineering Design and Research Institute, Guangzhou 510060, China;
2. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, Guangdong 510641, China
The transverse rigidity ratio considering staggered installation effect, the differential deformation coefficient and joint rigidity correction coefficients were proposed aioring at the problem that the calculation of longitudinal equivalent rigidity has not considered differential deformation, longitudinal joint characteristics and enhancement caused by staggered installation. Then the calculation formula of longitudinal equivalent rigidity of shield tunnel was deduced combined with numerical method in order to conduct example analysis. The sensitivity of longitudinal rigidity to correction parameters was explored. Results show that the horizontal deformation of lining is 15% smaller than vertical deformation under the transverse action, so it is defective to assume the same deformation in two directions of segment ring. The difference of segment opening is 17.6% when calculation uses actual joint of segment rings or equivalent homogeneous bolt under the same load, and the indispensable error appears during the longitudinal bending calculation when equivalent homogeneous bolt represent the actual joints of shield tunnel. The transverse rigidity increases by 17.5% caused by staggered installation, which causes obvious influence on longitudinal rigidity. Equivalent rigidity difference is 14.3% when calculation considers differential deformation, joints characteristics and transverse rigidity or not, and the influence of rigidity difference on longitudinal structure characteristics is significant. The longitudinal equivalent rigidity linearly decreases with the increase of the differential deformation, and increases with the increase of the joint rigidity correction and transverse rigidity ratio in a linear relation.
Received: 04 January 2017
Published: 09 March 2018
YANG Chun-shan, WEI Li-xin, MO Hai-hong, HE Ze-gan. Longitudinal rigidity of shield tunnel considering deformation characteristic and joints characteristic of lining. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2018, 52(2): 358-366.
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