Journal of Japan Society of Civil Engineers, Ser. F1 (Tunnel Engineering)
Online ISSN : 2185-6575
ISSN-L : 2185-6575
Paper (In Japanese)
CRACK-INDUCING CHARACTERISTICS AND CRACK CONTROL EFFECT IN LINING CONCRETE DUE TO CRACK-INDUCING JOINT FORMATION
Takahiro SAITOHajime HAMADAMidori MEGURONobuhiro CHIJIWAMitsuyasu IWANAMI
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2022 Volume 78 Issue 1 Pages 40-54

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Abstract

 It have been worked on the development of a construction method to extend the construction span length for the purpose of rapid construction of mountain tunnel lining concrete. With this construction method, the length of one construction span is longer than usual, so there was concern that the risk of cracking due to temperature changes and drying would increase. For this reason, a joint plate was installed in the center of the center before casting, and a crack-inducing joint was formed by pulling it out to try to reduce the risk of crack occurrence. A full-scale construction experiment was conducted to confirm the applicability of this method and to confirm the crack-inducing characteristics. Furthermore, the state of crack induction was reproduced by analysis, and the applicability to actual tunnel structures was analytically verified. As a result, it was confirmed that this method can induce cracks in the joints, that the induction of cracks can be reproduced by analysis, and that the induction of cracks can be effectively induced even in an actual tunnel model.

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© 2022 Japan Society of Civil Engineers
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