터널과지하공간 (Tunnel and Underground Space)

  • 제19권3호
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  • Pages.213-225
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  • 2009
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  • 1225-1275(pISSN)
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  • 2287-1748(eISSN)
한국암반공학회 (Korean Society for Rock Mechanics and Rock Engineering)
권호 표지

강원도 원주일대에 분포하는 화강암 및 화강편마암의 화학풍화실험에 의한 물성 변화 연구

Variation of Geomechanical Characteristics of Granite and Orthogneiss in Wonju Area due to Accelerated Artificial Chemical Weathering Tests

  • 우익 (군산대학교 해양건설공학과) ;
  • 엄정기 (부경대학교 에너지자원공학과) ;
  • 박혁진 (세종대학교 지구정보공학과)
  • 발행 : 2009.06.30
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초록

본 연구는 실내 화학풍화실험을 통하여 원주일대에 분포하는 화강암 및 화강편마암의 화학적 풍화특성을 평가하는데 목적이 있다. 이를 위하여 이중속실렛추출장치를 이용하여 170여일간의 용탈실험을 수행하고 연구 지역 암석의 화학적 풍화작용에 의한 원소 이동과 물성변화를 측정하였다. 풍화에 따른 구성광물의 반응정도에 따른 차별적 풍화침투와 P파속도의 전반적인 감소가 관찰되었으나, 공극률의 변화는 거의 없는 것으로 확인되었다. 화학풍화실험에 따른 화강암의 일축압축강도는 F 등급에서 20%, SW 등급에서 16% 정도 감소되는 것으로 나타났다. 연구지역에 분포한 화강편마암의 경우에는 뚜렷한 이방성에 의한 일축압축강도의 편차로 인하여 풍화에 따른 암석강도의 저감효과를 평가하기 어렵다. 연구지역에 대한 중 장기적인 풍화 예측을 위해서는 화학적 풍화와 더불어 물리적 풍화가 병행된 조건에서의 고찰 필요하며 앞으로도 심도있는 후속 연구가 요구된다.

The purpose of the study is to evaluate the effects of chemical weathering on the granite and orthogneiss in Wonju area based on accelerated artificial chemical weathering. The rock samples were scrutinized the variation of index properties and ion exchanges caused by artificial chemical weathering which was implemented with leaching test for 170 days using double soxhlet extractor. The differential weathering and decrease of p wave velocity were obtained by weathering process without significant changes of porosity. In case of granite samples, the uniaxial compression strength was reduced by 20% and 16% for the F-grade and SW-grade, respectively. For MW-grade granite, however, was not able to examine the effect of strength reduction due to lack of sample number. Also, for orthogneiss, it is difficult to compare the values of uniaxial compressive strength between before and after the test because of its strong anisotropy.

키워드

참고문헌

  1. 건설교통부, 1996, 터널공사표준시방서, 서울, pp. 21-36
  2. Carroll, D., 1970, Rock weathering. PlenumPress, 203p
  3. Dearman, W.R., 1976, Weathering classification in the characterisation of rock. Bulletin oj the Internationa IAssociation oj Engineering Geology, No 13, pp. 123-127
  4. Dearman, W.R., 1995, Description and classification of weathered rocks for engineering purposes: the background to the BS5930: 1981 proposals. Quarterly Journal of Engineering Geology, vol. 28, No.3, pp. 267-286 https://doi.org/10.1144/GSL.QJEGH.1995.028.P3.05
  5. Dearman, W.R., Baynes, FJ. and Irfan, T.Y., 1978, Engineering grading of weathered granite. Engineering Geology, vol. 12, pp. 345-374 https://doi.org/10.1016/0013-7952(78)90018-2
  6. Eissaa, EA and Kazi, A., 1988, Relation between static and dynamic Young's modulus of rocks. International Journal oj Rock Mechanics and Mining Sciences & Geomechanics Abstracts, vol. 25, pp. 479-482 https://doi.org/10.1016/0148-9062(88)90987-4
  7. Fookes, P. G., Dearman, W.R. and Franklin, JA, 1971, Some engineering aspects of rock weathering with field examples from Dartmoor and elsewhere. QuarterlyJournal of Engineering Geology, vol. 4, pp. 139-185 https://doi.org/10.1144/GSL.QJEG.1971.004.03.01
  8. Fookes, P.G., Gourley, C.S. and Ohikere, C., 1988, Rock weathering in engineering time, Quarterly Journal of Engineering Geology, vol. 21, No 1, pp.33-58 https://doi.org/10.1144/GSL.QJEG.1988.021.01.03
  9. G.S.E.G., 1995, Geological Society Engineering Group Working Party Report : The description and classification of weathered rocks for engineering purposes. Quarterly Journal oj Engineering Geology, vol. 28, No 3, pp. 207-242 https://doi.org/10.1144/GSL.QJEGH.1995.028.P3.02
  10. Iliev, I.G., 1966, An attempt to estimate the degree of weathering of intrusive rocks from their physicomechanical properties, Proc. lst Congo Int. Soc. Rock Mech., Lisbon, pp. 109-114
  11. Irfan, T.Y. and Dearman, W.R., 1978, Engineering classification and index properties of a weathered granite. Bulletin of the International Association of Engineering Geology, No17, pp. 79-90
  12. ISRM, 1978, Suggested methods for determining sound velocity : International Journal oj Rock Mechanics and Mining Sciences & Geomechanics Abstracts, vol. 15, pp. 53-58
  13. ISRM, 1979, Suggested methods for determining the uniaxial compressive strength and deformability of rock materials. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, vol. 16, pp. 137-140
  14. Kim, Y.H. and Hong, S.H., 1990. A quantitative study on the variational features of rock properties followed by weathered in granites. Journal of Korean Institute of Mining and Gelology, vol. 23, No 2, pp. 221-232
  15. Lee, S.G. and De Fretas M. H., 1989, A revision of the description and classification of weathered granite and its application to granites in Korea. QuarterlyJournal of Engineering Geology, vol. 22, pp. 31-48 https://doi.org/10.1144/GSL.QJEG.1989.022.01.03
  16. Lumb, P., 1983, Engineering properties of fresh and decomposed igneous rocks from Hong Kong. Engineering Geology, vol.l9, No2, pp. 81-94 https://doi.org/10.1016/0013-7952(83)90027-3
  17. Onodera, T.F., Yoshinaka, R., Oda, M., 1974, Weathering and its relation to mechanical properties of granite. Proceedings 3rd. International Congress of Society for Rock Mechanics, Denver, vol. 2A, pp. 71-78
  18. Price, D.G., 1995, Weathering and weathering processes. Quarterly Journal of Engineering Geology, vol. 28, No3, pp. 243-252 https://doi.org/10.1144/GSL.QJEGH.1995.028.P3.03
  19. Woo, I., Fleurisson, J.A, Park, YJ., Han, K.C, Song, W.K., Par, H.J., Kim, I.S., 2008, Essai d'alteration chimique acceleree au laboratoire par le double extracteur Soxhlet. Application a des roches granitique de Coree du Sud., Bulletin of Engineering Geology and the Environment, Vol. 67, pp. 443-452