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http://dx.doi.org/10.9711/KTAJ.2019.21.5.675

Reinforcement of shield tunnel diverged section with longitudinal member stiffness effect  

Lee, Gyu-Phil (Dept. of Infrastructure Safety Research, KICT)
Kim, Do (Dept. of Department of Civil and Environmental Engineering, Hanyang University)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.21, no.5, 2019 , pp. 675-687 More about this Journal
Abstract
In recent years, the needs for double deck-tunnels have increased in large cities due to the increase in traffic volume and high land compensation costs. In Korea, a network type tunnel which is smaller than general road tunnels and crosses another tunnel underground is planned. In the shield tunnel joints between the existing shield tunnel and the box-type enlargement section, a partial steel-concrete joint is proposed where the bending moment is large instead of the existing full-section steel joint. In order to analysis the enlargement section of the shield tunnel diverged section to reflect the three-dimensional effect, the two-dimensional analysis model is considered to consider the column effect and the stiffness effect of the longitudinal member. A two-dimensional analysis method is proposed to reflect the stiffness of the longitudinal member and the column effect of the longitudinal point by considering the rigidity of the longitudinal member as the elastic spring point of the connecting part in the lateral model. As a result of the analysis of the model using the longitudinal member, it was considered that the structural safety of the partial steel-concrete joint can be secured by reducing the bending moment of the joint and the box member by introducing the longitudinal member having the stiffness equal to or greater than a certain value.
Keywords
Tunnel diverged section; Tunnel enlargement; Deep tunnel; Partial steel-concrete joint; Beam-column effect;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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