Structural performance evaluation of precast concrete segment using synthetic fibres

Hoseong  Lee; Changyong Kim; Sean S Lee; Seungjun Kim; Kyeongjin   Lee

doi:10.9711/KTAJ.2018.20.2.469

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2018 Vol.20, Issue 2 Preview Page Next Page

Structural performance evaluation of precast concrete segment using synthetic fibres 프리캐스트 콘크리트 세그먼트의 합성섬유 보강재 적용에 따른 구조적 성능 평가

31 March 2018. pp. 469-483

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Abstract

Steel bars have been widely used as the primary reinforcement for Precast Segmental Concrete Lining for TBM Tunnels. Previously, studies have been carried out to gauge the potential for steel fiber reinforcement to replace the use of steel bar reinforcements in the segmental lining to reduce the amount of the steel bar reinforcement. Steel fiber reinforcements have been investigated and widely applied to SFRC TBM linings to improve the constructability of SFRC TBM linings worldwide. However, the steel fiber reinforcement often caused punctures to the water membranes inside tunnel lining and had long-term durability deterioration issues caused by steel corrosion, as well as cosmetic problems. Therefore, this paper sought to gauge the potential of synthetic fiber reinforcements, which have proven to be very attractive substitutes for steel fiber reinforcements. This study analyzed the performance of both steel and synthetic fiber reinforcements in segmental linings and evaluated the applicability of the fiber reinforcements to the TBM Precast Concrete Segmental Linings of TBM tunnels. As a conclusion, this study demonstrates that the potential use of steel and synthetic fibers in various combination, can substitute the rebar reinforcement in the concrete mix for segmental concrete linings.

Keywords

Shield TBM tunnel

Precast concrete segment lining

Synthetic fibre

Steel fibre

쉴드TBM 터널의 프리캐스트 콘크리트 세그먼트 라이닝의 보강재로 철근이 주로 사용되어 왔으나, 철근 보강량을 줄이 기 위하여 섬유보강재를 적용하는 연구가 진행되어 오고 있다. 세계적으로 터널 시공성을 향상시키기 위하여 강섬유보 강재를 적용한 연구와 시공이 진행되어 왔으나, 터널 라이닝 방수막에 대한 펀칭, 자체 부식에 의한 내구성 및 미관상의 문제로 인하여 이에 대한 적용이 국내에서는 미뤄지고 있는 실정이며, 이에 대한 대책으로 합성섬유가 강섬유의 대체제 로 주목 받고 있다. 이 연구에서는 섬유(강섬유, 합성섬유) 보강재를 사용한 프리캐스트 콘크리트 세그먼트의 파괴시험 을 통하여 성능을 분석하여 현장에서의 적용 가능성을 평가하였다. 그 결과 강섬유와 합성섬유의 조합이나 합성섬유의 혼입량에 따라 보조철근의 대체가 가능한 것으로 분석되었다.

키워드

쉴드TBM 터널

프리캐스트 콘크리트 세그먼트 라이닝

합성섬유

강섬유

References

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Information

Publisher :Korean Tunneling and Underground Space Association
Publisher(Ko) :한국터널지하공간학회
Journal Title :Journal of Korean Tunnelling and Underground Space Association
Journal Title(Ko) :한국터널지하공간학회 논문집
Volume : 20
No :2
Pages :469-483
Received Date : 2018-02-12
Revised Date : 2018-03-02
Accepted Date : 2018-03-08
DOI :https://doi.org/10.9711/KTAJ.2018.20.2.469

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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