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ISSN : 2233-8292

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Vol.17 No.4
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모형실험 및 현장계측을 통한 배수형 쉴드터널의 작용수압 저감 평가

The study on the hydraulic pressure reduction of drainage shield tunnel using model test and field instrumentation

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2015, v.17 no.4, pp.429-440
김동민 (한국건설기술연구원)
마상준 (한국건설기술연구원)
이영섭 (한국건설기술연구원)
김동민, 마상준, & 이영섭. (2015). 모형실험 및 현장계측을 통한 배수형 쉴드터널의 작용수압 저감 평가. (사)한국터널지하공간학회, 17(4), 429-440.
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초록

본 연구에서는 배수형 쉴드터널 적용시 작용수압의 저감을 평가하기 위해 모형실험장치를 개발하여 배수 및 비배수 조건에서 작용수압 차이를 실험하였다. 모형실험 결과 배수 조건에서 간극수압 증가율이 감소하는 경향을 보였고, 비배수 조건에 비해 전응력이 더 작게 나타나 모형터널 내 지하수 유입에 의해 작용수압이 저감되는 것으로 나타났다. 현장계측 결과 쉴드터널 배면 지반 내 작용수압은 지하수위로 계산되는 수압(·H)보다 약 11~22%정도 적게 나타났다. 모형실험 및 현장계측 결과에서 배수 및 비배수 조건의 이론적인 설계수압과 작용수압의 차이가 나타났는데, 배수형 쉴드터널 적용시 기존 설계수압보다 감소된 수압을 적용하는 것이 가능할 것으로 판단되며, 수압 감소를 통해 세그먼트 단면 축소도 가능할 것으로 판단된다.

keywords
배수형 쉴드터널, 배수 유로홈, 모형실험, 현장계측, 수압 저감, Drainage shield tunnel, Drainage furrow, Model test, Field instrumentation, Hydraulic pressure reduction

Abstract

In this study, model test equipment was developed to evaluate the hydraulic pressure reduction in appling the drainage shield tunnel and the model test for hydraulic pressure difference was performed in case of drainage and undrained conditions. In the result of model test, increase ratio of pore water pressure was decreased in drainage condition and total stress in drainage condition was smaller than that in undrained condition, so the hydraulic pressure was reduced by the groundwater inflow into the model tunnel. In the result of field instrumentation, the hydraulic pressure in the back ground of shield tunnel was small by 11~22% in comparison with the calculated hydraulic pressure (·H) in same groundwater level. In the result of model test and field instrumentation, it was appeared in drainage and undrained conditions that the difference between the theoretical hydraulic pressure and the real hydraulic pressure. It shows that it is possible to apply the reduced hydraulic pressure in applying the drainage shield tunnel and to reduce the segment section due to hydraulic pressure reduction.

keywords
배수형 쉴드터널, 배수 유로홈, 모형실험, 현장계측, 수압 저감, Drainage shield tunnel, Drainage furrow, Model test, Field instrumentation, Hydraulic pressure reduction

참고문헌

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