Study on Characteristics of In-situ Rock Stress State in Mountainous Region by Hydraulic Fracturing Method

Seong-ho Bae; Seok-won Jeon; yong-kun Choi; Hak-soo Kim

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2002 Vol.4, Issue 1 Preview Page Next Page

Study on Characteristics of In-situ Rock Stress State in Mountainous Region by Hydraulic Fracturing Method 수압파쇄시험에 의한 산악지역에서의 현지 암반 초기응력 측정 및 분포특성 연구

31 March 2002. pp. 57-70

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Abstract

Since early in the 90’s, the need for construction of underground rock structures such as long and large section traffic tunnel, energy storage cavern, industrial facility, etc. has been largely increased because the Korean territory is not wide and about 65 % of the land consists of mountainous region. The initial rock stress measurement has been widely conducted to provide the quantitative information on the stress state of engineering site at the design stage of underground rock structures. Among the diverse methods developed for measuring rock stress, hydraulic fracturing test is most popularly used because it is applicable at pre-construction stage and has no limit in testing depth. In this paper, the characteristics of initial rock stress state in mountainous region were studied on the basis of the in-situ hydraulic fracturing stress measurement results from the 60 test boreholes in various parts of Korea.

Keywords

in-situ rock stress

hydraulic fracturing test

horizontal stress ratio(K)

in-situ tensile strength

국토의 65% 이상이 산악으로 구성된 이유로 90년대 이후 산악지형의 암반을 대상으로 한 대규모 교통터널, 에너지 비축시설 및 산업용 저장소와 같은 대형 토목구조물의 필요성이 크게 증가하고 있다. 암반내 시공되는 토목 구조물의 설계과정에서 현지 암반의 초기응력장에 대한 정량적인 자료가 주요한 핵심요소로 작용하며 이러한 초기응력장에 대한 제반 정보를 획득하기 위한 목적으로 급내에서는 정밀 지반조사 과정에서 수앞파쇄법이 대표적으로 사용되고 있다. 본 논문에는 국내 각지의 산악지형에서 얻어지는 수압파쇄시험 현장 측정 자료들에 대한 해석결과를 바탕으로 국내 산악지형의 암반내 초기응력 분포 특성에 대한 분석으로 수행한다.

키워드

현지암반 초기응력

수압파쇄시험

측압계수

현지암반 인장강도

References

1) Amadei, B., Stepansson, O., 1997. Rock stress and its mea-surement: 2-30, 41-49, Chapman & Hall.

2) Bae, S. H. Choi, Y. K., Jeon, S. W., Lee, C. I., 2001. Characteristics of initial rock stress of mountaionous region in Korea, ISRM Eurock 2001/Epsoo/Finland, pp. 29-34.

3) Batchelor, A. S., Kwakwa, K.A., Proughten, A.J., Davis, N., 1997, Determination of the in-situ stresses at Sellafield : A case study, Int. Symp. On Rock Stress/Kumamoto/Japan; 265-276, Balkema.

4) Choy, H.H., Chan, C.F., Pun, W.K., Cheung L.S., 1997. Rock-stress measurement in the Hong Kong region, Int. Symp. on Rock Stress/Kumamoto/Japan; 391-396, Balkema.

5) Enever, J.R., 1993, Case studies of hydraulic fracture stress measurement in Australia. Comprehensive rock en-gineering Vol 3-2; 500-512, Pergamon Press.

6) Hudson, .A., Harrison, J.P., 1997, Engineering rock mehanics-an introduction to the principles; 94-96, Pergamon.

7) Jager, J.C., Cook, N.G.W., 1969, Fundamentals of rock mechanics: 181-186, Methuen & Co Ltd.

8) KIGAM(1995), A research on the excavation, support, and environment control of large scale underground space, Research Report(KR-95(T)-8); 110-119

9) Lee, M.Y., Haimson, B.C., 1980, Statisstical evaluation of hydraulicfracturing stress measurement parameters, Int. J. Rock Mech. Min. Sci. & Geomech. Vol. 26, No. 6: 447-456, Pergamon Press.

10) Lee, M.Y., 1991. Advances in instrument, data analysis, and calculation in hydraulic fracturing, Doctorial Thesis: 55-79, University of.Wisconsin-Madison.

11) Pusch, R., 1995, Rock mechanics on a geological base: 243-253, Elsevier.

12) Won, J.K, Lee, H.Y. & at al., 1991, The priciples of Geology(2nd ed.): 595-601, Woosungmoonwhasa.

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 : 4
No :1
Pages :57-70

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

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