Comparison of earth pressure around pipe-roof between UPRS and front-jacking method

Youngjong Sim; Kyu-Nam Jin; Ki-Il Song

doi:10.9711/KTAJ.2015.17.5.513

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2015 Vol.17, Issue 5 Next Page

Comparison of earth pressure around pipe-roof between UPRS and front-jacking method UPRS 공법과 프론트잭킹 공법의 파이프루프 주변 현장토압 계측결과 비교

30 September 2015. pp. 513-522

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Abstract

This study is to confirm the effect of pre-installed pipe-roof by measuring earth pressure acting on the underpass. In recently developed trenchless methods pre-inserted steel pipes before ground excavation to form pipe-roof are connected each other with re-bars and filled with mortar. In this study, focusing on the Upgraded Pipe Roof Structure method (UPRS) and Front-Jacking, earth pressure around pipe-roof is measured after insertion of steel pipe to ensure the effect of earth pressure reduction. In case of the UPRS earth pressure is considerably reduced because of the reinforced effect of pipe-roof. In case of the Front-Jacking in which the whole underpass structure is pushed into the ground, earth pressure is not reduced as expected, because the pre-installed pipes are not needed to be reinforced.

Keywords

Trenchless method

Pipe-roof

UPRS

Front-jacking

Earth pressure

본 연구의 목적은 비개착공으로 시공되고 있는 지하차도를 대상으로 지하차도 상부 및 측벽에 작용하는 토압을 계측하여 압입된 강관에 의한 지보효과 확인을 목적으로 하고 있다. 근래의 비개착공법은 파이프루프를 형성하기 위한 강관을 압입한 후 강관과 강관사이를 철근으로 보강하고 모르타르를 타설하는 방식으로 침하에 대한 안정성을 보다 확보하기 위한 노력을 기울이고 있다. 이에 최근 적용되고 있는 UPRS(Upgraded Pipe Roof Structure)공법과 프론트잭킹(Front-Jacking)을 중심으로 강관 압입 후 강관에 의한 토압감소효과를 확인하기 위하여 지하차도 주변의 토압을 계측하였다. 그 결과 UPRS공법의 경우 지하차도에 토압이 상당부분 감소하여 강관보강에 의한 지보강성 효과가 발휘되는 것으로 분석되었다. 프론트잭킹 공법의 경우 지하차도 구조물이 외부에서 제작되어 압입되는 형식으로 강관을 보강시킬 필요가 없기 때문에 강관보강에 의한 토압감소효과는 예측한대로 발휘되지 않는 것으로 분석되었다.

키워드

비개착공법

파이프루프

UPRS

프론트잭킹

토압

References

1.Ahuja, V., Sterling, R.L. (2008), “Numerical modelling approach for microtunnelling assisted pipe-roof support system”, World Tunnel Congress 2008 - Underground Facilities for Better Environment and Safety, pp. 1678-1687.

2.Choi, S.W., Park, Y.T., Chang S.H., Bae, G.J., Lee, K.T., Baek, Y.K. (2012), “A numerical study on the three-dimensional ground movement by the trenchless construction method of concrete box by a square steel pipe supporting system”, J of Korean Tunn and Undergr Sp Assoc, Vol. 14, No. 5, pp. 469-484.

3.Choi, S.W., Park, Y.T., Chang S.H., Bae, G.J., Lee, K.T., Baek, Y.K. (2012), “An experimental study on the ground movement around a square pipe by its penetration for trenchless construction in sandy ground”, J of Korean Tunn and Undergr Sp Assoc, Vol. 14, No. 5, pp. 485-501.

4.Eum, K.Y., Choi, C.Y., Cheon, J.Y. (2010), “Analysis of heaving and settlement test of scale model depending on shape of the pipe during pipe roof excavation”, J. Korean Geosynthetics Society, Vol. 9, No. 4, pp. 9-15.

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7.Lee, Y.B., Kim, J.Y., Park, I.J., Kim, K.G., Lee, J.H. (2003), “A study on the applicability of under ground structure using steel tubular roof in Korean geotechnical condition”, J of Korean Tunn and Undergr Sp Assoc, Vol. 5, No. 4, pp. 401-409.

8.Sim, Y.J., Jin, K.N., Lee, K.H. (2013), “Measurement of earth pressure around underpass by non-open-cut method”, KGS Spring National Conference 2013, March 21-22, 2013.

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 : 17
No :5
Pages :513-522
Received Date : 2015-06-16
Revised Date : 2015-09-02
Accepted Date : 2015-09-07
DOI :https://doi.org/10.9711/KTAJ.2015.17.5.513

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

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