Journal of Japan Society of Civil Engineers, Ser. F1 (Tunnel Engineering)
Online ISSN : 2185-6575
ISSN-L : 2185-6575
Technical Report (In Japanese)
VERIFICATION OF STRESS RELEASE RATE OF 2D NUMERICAL ANALYSIS AGAINST FULL FACE METHOD USING IMMEDIATELY RING CLOSURE
Kazuhiko MAEGAWAHiroshi YAGITetsuo ITOShogo KUNIMURAYuzo OKUIHiroshi KUWASHIMAYujing JIANG
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2022 Volume 78 Issue 1 Pages 26-39

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Abstract

 When designing with two-dimensional numerical analysis, the concept of stress release rate is used in order to simulate three-dimensional deformation behaviour. Generally, the stress release rate in the 2D numerical simulations is set to 40% before the support is installed and the remaining stress is released after the support is installed. However, there is no particular thing about the early closure of all sections, which has been increasingly used in recent years. Therefore, the authors derived the optimum stress release rate for the early closing of all sections by trial calculation, which is a three-stage stress release, leading displacement rate α = 40%, after installation of upper half support support β = 20%. It was also found that the semi-support + invert support = 40% could reproduce the 3D deformational behaviour more appropriately.

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© 2022 Japan Society of Civil Engineers
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