지질공학 (The Journal of Engineering Geology)

  • 제18권2호
  • /
  • Pages.207-214
  • /
  • 2008
  • /
  • 1226-5268(pISSN)
  • /
  • 2287-7169(eISSN)
대한지질공학회 (The Korean Society of Engineering Geology)
권호 표지

점토함량에 따른 미고결 이암의 시간 의존적 변형 비교

Comparison of Time-Dependent Deformation in Unconsolidated Mudstones with Different Clay Content

  • 장찬동 (충남대학교 지질환경과학과) ;
  • 명우호 (충남대학교 지질환경과학과) ;
  • 이태종 (한국지질자원연구원 지하수지열연구부)
  • Chang, Chan-Dong (Department of Geology, Chungnam National University) ;
  • Myoung, Woo-Ho (Department of Geology, Chungnam National University) ;
  • Lee, Tae-Jong (Groundwater & Geothermal Resources Division, Korea Institute of Geoscience & Mineral Resources)
  • 발행 : 2008.06.30
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

점토함량에 따른 미고결 이암의 시간 의존적 변형을 비교하기 위해 측방변형이 구속된 상태에서의 일축압밀시험을 수행하였다. 미고결 이암의 변형은 응력의 증가에 따른 즉각적인 변형과 일정한 응력 하의 크리프 변형으로 구분되었다. 응력 증가분이 동일한 경우에 시간 의존적 변형은 거의 일정한 크기로 발생하였으며 응력 증가분이 증가할수록 크리프변형의 크기도 증가하여 선형점성변형의 특성을 보였다. 점토함량이 증가함에 따라 시간 의존적 변형은 증가하는 경향을 보여 점토가 이암의 시간 의존적 변형 발생에 중요한 역할을 하는 것으로 사료된다. 크리프 변형은 시간에 따라 지수함수 형태를 보여 크립 모델 중 하나인 power-law 모델로 잘 예측될 수 있었다.

We conducted uniaxial consolidation tests in mudstone samples with different clay content, in order to investigate time-dependent deformation and its characteristics. A significant amount of time-dependent strain was observed at a constant stress level immediately after a jump of stress was applied. For a given mudstone, the amount of time-dependent deformation was nearly proportional to the increment of stress, suggesting a linear viscous rheology. The amount of time-dependent strain increases with clay content, implying that clay plays an important role in creep of the unconsolidated mudstone. A power-law model was suitably applied to our results, suggesting that a short-term prediction of time-dependent deformation of the mudstone is tentatively feasible.

키워드

참고문헌

  1. 김광식, 김교원, 2003, 포항분지 제3기 두호층 이암의 크리프 거동, 지질공학, 13, 227-238
  2. 송윤호, 이창범, 박덕원, 김형찬, 이철우, 이성곤, 박인화, 이태종, 심병완, 조병욱, 염병우, 이승구, 기원서, 현혜자, 오재호, 이윤수, 박찬, 정용복, 김통권, 이진수, 고동찬, 안은영, 윤욱, 2005, 심부 지열에너지 개발 사업, 과학기술부, 147p
  3. 정태종, 1996, 의성 소분지에 분포하는 백악기 사암의 크리프 시험, 대한지구과학회지, 17, 109-118
  4. 한국표준협회, 2002, 흙의 압밀 시험 방법(KS F 2316), 한국표준협회, 14p
  5. Azam, S., 2003, Influence of mineralogy on swelling and consolidation of soils in eastern Saudi Arabia, Canadian Geotechnical Journal: Revue canadienne de gotechnique, 40, 964-975 https://doi.org/10.1139/t03-047
  6. Dudley, J.W., Myers, M.T., Shew, R.D., and Arasteh, M.M, 1994, Measuring compaction and compressibilities in unconsolidated reservoir materials via time-scaling creep, in Rock Mechanics in Petroleum Engineering, 45-54
  7. Dugan, B., Flemings, P.B., Olgaard, D.L., and Gooch M.J., 2003, Consolidation, effective stress, and fluid pressure of sediments from ODP Site 1073, US mid- Atlantic continental slope, Earth and Planetary Science Letters, 215, 13-26 https://doi.org/10.1016/S0012-821X(03)00425-4
  8. Fabre, G. and Pellet, F., 2006, Creep and time-dependent damage in argillaceous rocks, Int. J. Rock Mech. and Min. Sci., 43, 950-960 https://doi.org/10.1016/j.ijrmms.2006.02.004
  9. Gasc-Barbier, M., Chanchole, S., and Brest, P., 2004, Creep behaviour of Bure clayey rock, Applied Clay Science, 26, 449-458 https://doi.org/10.1016/j.clay.2003.12.030
  10. Hagin, P.N. and Zoback, M.D., 2004, Viscous deformation of unconsolidated sands-Part 1: Time-dependent deformation, frequency dispersion, and attenuation, Geophysics, 69, 731-741 https://doi.org/10.1190/1.1759459
  11. Hyde, A.F.L. and Brown, S.F., 1976, The plastic deformation of a silty clay under creep and repeated loading, Gotechnique, 26, 173-184 https://doi.org/10.1680/geot.1976.26.1.173
  12. Jaurez-Badillo, E., 1985, General time volume change equation for soils, Proceedings International Conference on Soil Mechanics and Foundation Engineering, 2, 519-530
  13. Maekawa, H., Miyakita, K., and Sekiguchi, H., 1991, Elasto-viscoplastic consolidation of a diatomaceous mudstone, Soil and Foundations, 31, 93-107
  14. Maranini, E. and Brignoli, M., 1999, Creep behaviour of a weak rock: experimental characterization, Int. J. Rock Mech. and Min. Sci., 36, 127-138 https://doi.org/10.1016/S0148-9062(98)00171-5
  15. Murakami, Y., 1979, Excess pore-water pressure and preconsolidation effect developed in normally consolidated clays of some age, Soils and Foundations, 19, 17-29 https://doi.org/10.3208/sandf1972.19.4_17
  16. Onargan, T., Koca, M. Y., Kucuk, K., Deliormanli, A., and Saydam, S., 2004, Impact of the mechanical characteristics of weak rocks and trona ore beds on the main drift deformation at Beypazari mine, Turkey, Int. J. Rock Mech. and Min. Sci., 41, 641-654 https://doi.org/10.1016/j.ijrmms.2004.01.006
  17. Peng, S., Fu, J., and Zhang, J., 2007, Borehole casing failure analysis in unconsolidated formations: A case study, J. Petrol. Sci. Eng., 59, 226-238 https://doi.org/10.1016/j.petrol.2007.04.010
  18. Robinson, R.G., 1999, Consolidation analysis with pore water pressure measurements, Gotechnique, 49, 127-132 https://doi.org/10.1680/geot.1999.49.1.127
  19. Singh, A. and Mitchell, J.K., 1968, General stressstrain- time function for soils, Journal of Soil Mechanics and Foundation Division, ASCE, 95, 21-46
  20. Singh, D.P., 1975, A study of creep of rocks, Int. J. Rock Mech. Min. Sci. and Geomech. Abstr., 12, 271-276 https://doi.org/10.1016/0148-9062(75)91084-0
  21. Tomanovic, Z., 2006, Rheological model of soft rock creep based on the tests on marl, Mechanics of Time-Dependent Materials, 10, 135-154 https://doi.org/10.1007/s11043-006-9005-2
  22. Yoshimi, Y., 1987, Pore pressure dissipation ratio for a nonlinear consolidation problem, Soils and Foundations, 27, 88-90 https://doi.org/10.3208/sandf1972.27.3_88