Experimental study on deformation of concrete for shotcrete use in high geothermal tunnel environments

Shengai Cui; Pin Liu; Xuewei Wang; Yibin Cao; Yuezhong Ye

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자료유형: 학술저널

저자정보: Shengai Cui (Southwest Jiaotong University) Pin Liu (Southwest Jiaotong University) Xuewei Wang (Southwest Jiaotong University) Yibin Cao (Southwest Jiaotong University) Yuezhong Ye (Southwest Jiaotong University)

저널정보: 한국계산역학회 Computers and Concrete, An International Journal Computers and Concrete, An International Journal Vol.19 No.5

발행연도: 2017.1

수록면: 443 - 449 (7page)

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Taking high geothermal tunnels as background, the deformation of concrete for shotcrete use was studied by simulating hot-humid and hot-dry environments in a laboratory. The research is made up by two parts, one is the influence of two kinds of high geothermal environments on the deformation of shotcrete, and the other is the shrinkage inhibited effect of fiber materials (steel fibers, polypropylene fibers, and the mixture of both) on the concrete in hot-dry environments. The research results show that: (1) in hot and humid environments, wet expansion and thermal expansion happened on concrete, but the deformation is smooth throughout the whole curing age. (2) In hot and dry environments, the concrete suffers from shrinkage. The deformation obeys linear relationship with the natural logarithm of curing age in the first 28 days, and it becomes stable after the 28th day. (3) The shrinkage of concrete in a hot and dry environment can be inhibited by adding fiber materials especially steel fibers, and it also obeys linear relationship with the natural logarithm of curing age before it becomes stable. However, compared with no-fiber condition, it takes 14 days, half of 28 days, to make the shrinkage become stable, and the shrinkage ratio of concrete at 180-day age decreases by 63.2% as well. (4) According to submicroscopic and microscopic analysis, there is great bond strength at the interface between steel fiber and concrete. The fiber meshes are formed in concrete by disorderly distributed fibers, which not only can effectively restrain the shrinkage, but also prevent the micro and macro cracks from extending.

참고문헌 (17)

참고문헌 신청

Chen, G. Q. / 2014 / Temperature effect of rock burst for hard rock in deep-buried tunnel / Nat. Haz. 72(2):915~926

Cui, S. A. / 2013 / Bond strength of shotcrete with rock in dry and hot environment of high ground temperature tunnel / J. Build. Mater. 16(4):663~666

Shengai Cui / 2016 / Experimental Study on Bond Performance between Shotcrete and Rock in a Hot and Humid Tunnel Environment / KSCE Journal of Civil Engineering 20(4):1385~1391

2001 / Specifications for Bolt-Shotcrete Support / GB50086

Gu, B. S. / 2007 / Counter measures against high temperature in a tunnel and the corresponding ventilation design-feasibility study for the super-long gaoligongshan tunnel / Mod. Tunnel. Technol. 44(2):66~71

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