Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
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Effects of Rock Weathering on the Degradation of Engineering Properties

암반풍화도에 따른 지질공학적 특성 저감효과

  • Published : 2005.12.01
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Abstract

Weathering is defined as a process by which surface rock, once formed in the deep ground, is broken down and altered to keep the equilibrium with the ambient environment. In this study granitic rock samples of different weathering grades were collected in the field and the microscopic observation, X-ray diffraction analysis, electron microscopic observation, chemical analysis, and rock property tests were carried out. Formation of secondary minerals, especially clay minerals, by weathering was identified and the mechanism for the change of engineering properties such as rock strength degradation was analyzed. Tunnel model test, Failure behaviour, Shallow tunnel, Unsupproted tunnel length.

풍화작용은 심부에서 생성된 암석이 지표에서 파괴되고 변질되어 현재의 환경조건과 평형을 이루는 산물을 형성하는 과정이다. 본 연구에서는 국내에서 가장 분포면적이 넓은 화강암질암의 풍화단계별 시료를 채취하여 편광현미경관찰, X-선 회절분석, 전자현미경관찰, 화학분석, 물성시험등을 수행하였다. 실험결과에 의거하여 풍화에 의해 형성되는 2차광물, 특히 점토광물의 형성과정을 확인하였고, 풍화에 따른 암석의 공학적인 성질변화와 물성저하의 메카니즘을 규명하였다.

Keywords

References

  1. 김영화, 1978, 함수율의 변화에 따른 지진파 속도의 변화 특성에 관하여, 서울대학교 석사논문
  2. 김영화, 홍순호, 1990, 풍화현상에 수반되는 화강암의 물성변화에 관한 연구, 광산지질, 23, pp.221-232
  3. BSI (1981). Code of Practice for Site Investigations, BS 5930: 1981. British Standards Institution, London, p.149
  4. Deere DU, Miller RP (1966). Engineering classification and index properties for intact rock. Tech Rep AFNL-TR-65-116. Air Force Weapon Laboratory, New Mexico
  5. Dearman, W.R. (1976). Weathering classification in the characterisation of rock: a revision. Bulletin of the International Association of Engineering Geology, No. 13, pp.123-127
  6. Fookes PG, Dearman WR, Frankin JA (1971). Some engineering aspects of rock weathering with field examples from Dartmoor and elsewhere. Q. J. Eng. Geol. 4(3): 139-185 https://doi.org/10.1144/GSL.QJEG.1971.004.03.01
  7. Hodder APW, Hetherington JR (1991). A quantitative study of the weathering of greywacke. Tech. Note. Eng. Geol. 31: 353-368 https://doi.org/10.1016/0013-7952(1)90017-F
  8. Hamral, A. (1961). A quantitative classification of the weathering and weatherability of racks. Procedings of the Fifth International Conference on Soil Mechanics and Foundation Engineering, Paris, vol.2, pp 771-774
  9. ISRM (1981). Rock characterization, testing and monitoring. In: Brown ET (ed) Suggested methods. Pergamon Press, Oxford
  10. IIiev, LG. (1967). An attempt to measure the degree of weathering of intrusive racks from their physicomechanical properties. Proceedings of the First International Congress, International Society of Rock Mechanics, Lisbon, vol. 1, pp.109-114
  11. IAEG (1981). Rock and soil descriptions and classification for engineering geological mapping. Bulletin of the International Association of Engineering Geology, No. 24, pp.235-274
  12. Irfan TY, Dearman WR (1978). Engineering classification and index properties of a weathered granite. Bull. Int. Eng. Geol. 11: 233-244
  13. Little, A.L. (1969). The engineering classification of residual tropical soils. Proceedings of the Seventh I nternational Conference on Soil Mechanics and F oundation Engineering, Mexico, vol. 1, pp.1-10
  14. Lee SG, de Freitas MH (1988). A revision of the description and classification of weathered granite and its application to granites in Korea. Q. J. Eng. Geol. 22: 31-48 https://doi.org/10.1144/GSL.QJEG.1989.022.01.03
  15. Onodera, T.F., Yashinaka, R. & ada, M. (1974). Weathering and its relation to mechanical properties of granite. Proceedings of the Third International Congress, International Society of Rock Mechanics, Denver, vol.2, pp 71-78
  16. Oilier, K.M. (1975). Weathering. Longman, London, p.304
  17. Parker A (1970). An index of weathering for silicate rocks. Geol. Mag. 107: 501-504 https://doi.org/10.1017/S0016756800058581
  18. Ruxton, B.P. & Berry, L. (1957). Weathering of granite and associated erosional features in Hong Kong. Bulletin of the Geological Society of America, vol 68, pp.1263-1291 https://doi.org/10.1130/0016-7606(1957)68[1263:WOGAAE]2.0.CO;2
  19. Streckeisen, A.L. (1973). Pliutonic rocks-classification and nomenclature recommended by the lUGS subcommission of the systematics of igneous rocks. Geotimes. 18: 26-32