Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Classification of Shear Strength according to Breccia Content in Fault Core

단층각력 함량에 따른 전단강도의 분류

  • Yun, Hyun-Seok (Department of Earth and Environmental Sciences, Chungbuk National University) ;
  • Moon, Seong-Woo (Department of Earth and Environmental Sciences, Chungbuk National University) ;
  • Seo, Yong-Seok (Department of Earth and Environmental Sciences, Chungbuk National University)
  • 윤현석 (충북대학교 지구환경과학과) ;
  • 문성우 (충북대학교 지구환경과학과) ;
  • 서용석 (충북대학교 지구환경과학과)
  • Received : 2020.01.29
  • Accepted : 2020.02.20
  • Published : 2020.04.28
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Abstract

Analysis of variance (ANOVA) and multiple comparison analysis were performed for shear strengths categorized by breccia content of 5 wt.% (Case-I), 10 wt.%, (Case-II) and 15 wt.% (Case-III) in fault cores. The relationship between breccia contetnt and shear strength was quantitatively classified by calculating the mean and standard deviation of shear strength for each population in each case and then the grouping the breccia contents that had a statistically similar effect on the dispersion of shear strength. As a result, shear strength was clearly classified into group 1 (breccia content of 0-15 wt.%) and group 2 and 3 (breccia coantent of 15-30 wt.% and 30 wt.% or more) in Case-III. Shear strength of the standard line at breccia content of 15 wt.% were determined to be 43.6 kPa, 77.6 kPa, and 118.6 kPa at each normal stress (54 kPa, 108 kPa, and 162 kPa), respectively. In addition, the distribution range of cohesions is 0-43.6 kPa at breccia content of 15 wt.% or less, and 0-70.0 kPa at 15 wt.% or more. Distribution range of friction angles is 0-45.7 ° at breccia content of 15 wt.% or less, and 16.7-57.5 ° at 15 wt.% or more.

본 연구에서는 단층핵의 각력(≥4.75 mm) 함량에 따라 각각 5 wt.% (Case-I), 10 wt.% (Case-II) 및 15 wt.%(Case-III) 단위로 전단강도(최대 전단강도)에 대한 모집단을 분류한 후, 각 Case에 대한 분산분석(ANOVA, analysis of variance)과 다중비교분석(multiple comparison analysis)을 수행하였다. 각 수직응력(54 kPa, 108 kPa, 162 kPa)에서 모집단별로 전단강도의 평균과 표준편차를 계산하고, 전단강도의 분산에 통계적으로 유사한 영향을 미치는 각력 함량을 그룹화함으로써 각력 함량과 전단강도 사이의 관계를 정량적으로 분류하였다. 분석 결과, 전단강도는 각력 함량을 15 wt.% 단위로 범주화한 Case-III에서 집단 1(각력 함량 0~15 wt.%)과 집단 2,3(각력 함량 15~30 wt.%와 30 wt.% 이상)으로 명확하게 분류되었다. Case-III의 각력 함량 15 wt.%에서 분류 기준이 되는 전단강도를 산정한 결과, 수직응력별(54 kPa, 108 kPa, 162 kPa)로 각각 43.6 kPa, 77.6 kPa, 118.6 kPa로 산정되었다. 이 결과를 바탕으로 점착력과 내부마찰각의 분포 범위를 산정한 결과, 점착력의 분포 범위는 각력 함량 15 wt.% 이하에서 0~43.6 kPa, 15 wt.% 이상에서 0~70.0 kPa이며, 내부마찰각의 분포 범위는 각력 함량 15 wt.% 이하에서 0~45.7°, 15 wt.% 이상에서 16.7~57.5°로 산정되었다.

Keywords

References

  1. Anthony, J.L. and Marone, C. (2005) Influence of particle characteristics on granular friction, Journal of Geophysical Research, v.110, B08409. doi:10.1029/2004JB003399.
  2. ASTM D1140-17 (2017) Standard test methods for determining the amount of material finer than 75-${\mu}m$ (No. 200) sieve in soils by washing. West Conshohocken, PA, DOI: 10.1520/D1140-17.
  3. ASTM D422-63 (2007) Standard test method for particlesize analysis of soils. ASTM International, West Conshohocken, PA, 2007, DOI: 10.1520/D0422-63R07E02.
  4. ASTM D2487-17 (2017) Standard practice for classification of soils for engineering purposes (Unified Soil Classification System). ASTM International, West Conshohocken, PA, DOI: 10.1520/D2487-17.
  5. ASTM D3080-11 (2011) ASTM D3080-11, Standard Test Method for Direct Shear Test of Soils Under Consolidated Drained Conditions, ASTM International, West Conshohocken, PA, DOI: 10.1520/D3080_D3080M-11
  6. Billi, A., Salvini, F. and Storti, F. (2003) The damage zonefault core transition in carbonate rocks: implications for fault growth, structure and permeability, Journal of Structural Geology, v.25, p.1779-1794. https://doi.org/10.1016/S0191-8141(03)00037-3
  7. Billi, A. and Storti, F. (2004) Fractal distribution of particle size in carbonate cataclastic rocks from the core of a regional strike-slip fault zone, Tectonophysics, v.384, p.115-128. https://doi.org/10.1016/j.tecto.2004.03.015
  8. Blenkinsop, T.G. (1991) Cataclasis and processes of particle size reduction. Pure and Applied Geophysics, v.136, p.59-86. https://doi.org/10.1007/BF00878888
  9. Caine, J.S., Evans, J.P. and Forster, C.B. (1996) Fault zone architecture and permeability structure, Geology, v.24, p.1025-1028. https://doi.org/10.1130/0091-7613(1996)024<1025:FZAAPS>2.3.CO;2
  10. Chang, T.W. and Choo, C.O. (1998) Formation processes of fault gouges and their K-Ar ages along the Dongnae Fault, The Journal of Engineering Geology, 8(2), p.175-188. (in Korean with English abstract) https://doi.org/10.3969/j.issn.1004-9665.2000.02.008
  11. Chester, F.H., Evans, J.P. and Biegel, R.L. (1993) Internal structure and weakening mechanisms of the San Andreas Fault, Journal of Geophysical Research, v.98(1), p.771-786. https://doi.org/10.1029/92JB01866
  12. Choi, J.H., Kim, Y.S., Gwon, S.H., Paul, E., Sowreh, R., Kim, T.H. and Lim, S.B. (2015) Characteristics of large-scale fault zone and quaternary fault movement in Maegok-dong, Ulsan. Journal of Engineering Geology, v.25, p.485-498. (in Korean with English abstract) https://doi.org/10.9720/kseg.2015.4.485
  13. Clark, C. and James, P. (2003) Hydrothermal brecciation due to fluid pressure fluctuations: examples from the Olary Domain, SouthAustralia, Tectonophysics, v.366, p.187-206. https://doi.org/10.1016/S0040-1951(03)00095-7
  14. Faulkner, D.R., Lewis, A.C. and Rutter, E.H. (2003) On the internal structure and mechanics of large strikeslip fault zones: field observations of the Carboneras fault in southeastern Spain, Tectonophysics, v.367, p.235-251. https://doi.org/10.1016/S0040-1951(03)00134-3
  15. Fisher, R.A. (1924) On a distribution yielding the error functions of several well known statistics, Proceedings International Mathematical Congress, Toronto, v.2, p.805-813.
  16. Frye, K.M. and Marone, C. (2002) The effect of particle dimensionality on granular friction in laboratory shear zones, Geophysical Research Letters, v.29, 1916. doi:10.1029/2002GL015709.
  17. Goodman, R.E. and Ahlgren, C.S. (2000) Evaluating safety of concrete gravity dam on weak rock, Scott Dam, Journal of Geotechnical and Geoenvironmental Engineering, v.126, p.429-442. https://doi.org/10.1061/(ASCE)1090-0241(2000)126:5(429)
  18. Gutierrez, M. and Muftah, A. (2011) The effects of rolling resistance on the stress-strain and strain localization behavior of granular materials due to simple shear loading conditions, II International Conference on Particle based Methods Fundamentals and Applications, p.1-12.
  19. Hazzard, J.F. and Mair, K. (2003) The importance of the third dimension in granular shear, Geophysical Research Letters, v.30, 1708, doi:10.1029/2003GL017534.
  20. Henderson, I.H.C., Ganerod, G.V. and Braathen, A. (2010) The relationship between particle characteristics and frictional strength in basal fault breccias: Implications for fault-rock evolution and rockslide susceptibility, Tectonophysics, v.486, p.132-149, https://doi.org/10.1016/j.tecto.2010.02.002
  21. Heynekamp, M.R., Goodwin, L.B., Mozley P.S. and Haneberg, W. C. (1999) Controls on fault-zone architecture in poorly lithified sediments, Rio Grande Rift, New Mexico: implications for fault zone permeability and fluid flow. In: Haneberg, W.C., Mozley, P.S., Moore, J.C. and Goodwin, L.B. (Eds.), Faults and Subsurface Fluid Flow in the Shallow Crust, American Geophysical Union Geophysical Monograph, v.113, p.27-50.
  22. Kahraman, S. and Alber, M. (2006) Estimating unconfined compressive strength and elastic modulus of a fault breccia mixture of weak blocks and strong matrix, International Journal of Rock Mechanics and Mining Sciences, v.43, p.1277-1287. https://doi.org/10.1016/j.ijrmms.2006.03.017
  23. Kato, N. and Hirono T. (2016) Heterogeneity in friction strength of an active fault by incorporation of fragments of the surrounding host rock, Earth, Planet and Space, v68, 134, p.1-7. https://doi.org/10.1186/s40623-015-0369-x
  24. Kim, K.Y., Suh, H.S., Yun, T.S., Moon, S.W. and Seo, Y.S. (2016) Effect of particle shape on the shear strength of fault gouge, Geosciences Journal, v.20, p.351-359. https://doi.org/10.1007/s12303-015-0051-0
  25. Kosa, E., Hunt, D., Fitchen, W.M., Bockel-rebelle, M.O. and Roberts, G. (2003) The heterogeneity of palaeocavern systems developed along syndepositional fault zones: the Upper Permian Capitan Platform, Guadalupe Mountains, U.S.A. In Permo-Carboniferous Carbonate Platforms and Reefs (eds W. M. Ahr, P. M. Harris, W. A. Morgan and I. D. Somerville), Special Publication of the Society of Economic Paleontologists and Mineralogists, v.78, p.291-322.
  26. Lindquist, E.S. (1994) The strength and deformation prop-erties of melange, Ph.D. Thesis, University of Cali-fornia, Berkeley.
  27. Liu, Q., Button E. and Klima K. (2007) Investigation for probabilistic prediction of shear strength properties of clay-rich fault gouge in the Austrian Alps, Engineering Geology, v.94, p.103-121. https://doi.org/10.1016/j.enggeo.2007.08.001
  28. Mair, K. and Abe, S. (2008) 3D numerical simulations of fault gouge evolution during shear: Grain size reduction and strain localization, Earth and Planetary Science Letters, v.274, p.72-81. https://doi.org/10.1016/j.epsl.2008.07.010
  29. Mair, K., Frye, K. and Marone, C. (2002) Influence of grain characteristics on the friction of granular shear zones, Journal of Geophysical Research, v.107.
  30. Medley, E.W. (1994) The engineering characterization of melanges and similar Block-in-matrix rocks (Bimrocks), Ph.D. Thesis, University of California. Berkeley.
  31. Mitra, G. (1993) Deformation processes in brittle deformation zones in granitic basement rocks: a case study from the Torrey Creek area, Wind River mountains. In: Schmith, C.J., Chase, R.B., Erslev, E.A. (Eds.), Laramide Basement Deformation in the Rocky Mountains Foreland of the Western United States. Geological Society of America Special Paper, Boulder, Colorado, p. 177-195.
  32. Moon, S.W., Yun, H.S., Kim, W.S., Na, J.H., Kim, C.Y. and Seo, Y.S. (2014) Correlation analysis between weight ratio and shear strength of fault materials using multiple regression analysis, The Journal of Engineering Geology, v.24, p.397-409. (in Korean with English abstract) https://doi.org/10.9720/kseg.2014.3.397
  33. Morgan, J.K. (1999) Numerical simulations of granular shear zones using the distinct element method, 1. Shear zone kinematics and the micromechanics of localization, Journal of Geophysical Research, v.104, p.2703-2718. https://doi.org/10.1029/1998JB900056
  34. North American Geologic-map Data Model Science Language Technical Team (2004) Report on progress to develop a North American science-language standard for digital geologic-map databases; Appendix B: Classification of metamorphic and other compositegenesis rocks, including hydrothermally altered, impactmetamorphic, mylonitic, and cataclastic rocks. In Digital Mapping Techniques '04 - Workshop Proceedings (ed. D. R. Soller), U.S. Geological Survey Open File Report No. 2004-1451, p.85-94.
  35. Otsuki, K., Monzawa, N. and Nagase, T. (2003) Fluidization and melting of fault gouge during seismic slip: identification in the Nojima fault zone and implications for focal earthquake mechanisms, Journal of Geophysical Research v.108, 2192.
  36. Rawling, G.C. and Goodwin, L.B. (2003) Cataclasis and particulate flow in faulted, poorly lithified sediments, Journal of Structural Geology, v.25, p.317-331. https://doi.org/10.1016/S0191-8141(02)00041-X
  37. Roadifer, J.W., Forrest, M.P. and Lindquist, E.S. (2009) Evaluation of Shear Strength of Melange Foundation at Calaveras Dam, Proceedings of 29th US Society for Dams, Annual Meeting and Conference: "Managing our Water Retention Systems", April 20-24, Nashville, Tennessee, p.507-521.
  38. Sammis, C., King, G. and Biegel, R. (1987) The Kinematics of Gouge Deformation, Pure and Applied Geophysics, v.125, p.777-812. https://doi.org/10.1007/BF00878033
  39. Scheffe, H. (1959) The Analysis of Variance. Wiley, New York.
  40. Seo, Y.S., Yun,, H.S., Ban, J.D. and Lee, C.K. (2016) Mechanical properties of fault rocks in Korea, The Journal of Engineering Geology, v.26, p.571-581. https://doi.org/10.9720/kseg.2016.4.571
  41. Shigematsu, N., Fujimoto, K., Ohtani, T. and Goto, K. (2004) Ductile fracture of fine-grained plagioclase in the brittle-plastic transition regime: implication for earthquake source nucleation, Earth and Planetary Science Letters, v.222, p.1007-1022. https://doi.org/10.1016/j.epsl.2004.04.001
  42. Shipton, Z.K., Soden, A.M., Kirkpatrick, J.d., Bright, A.M. and Lunn, R.J. (2006) How thick is a fault? fault displacement-thickness scaling revisited, Geophysical Monograph Series, v.170, p.193-198.
  43. Sim, H., Song, Y.G., Son, M., Park,C.G., Choi, W.H. and Khulganakhuu, C. (2017) Department of Earth System Sciences, Yonsei Reactivated Timings of Yangsan Fault in the Northern Pohang Area, Korea, Economic Environmental Geology, v.50, p.97-104. (in Korean with English abstract) https://doi.org/10.9719/EEG.2017.50.2.97
  44. Sibson, R.H. (1977) Fault rocks and fault mechanisms, Journal of the Geological Society, v.133, p.191-213. https://doi.org/10.1144/gsjgs.133.3.0191
  45. Sibson, R.H. (1975) Generation of pseudotachylyte by ancient seismic faulting, Geologycal Jounal of the Royal Astronomical Society, v.43, p.775-794. https://doi.org/10.1111/j.1365-246X.1975.tb06195.x
  46. Snoke, A.W., Tullis, J. and Todd, V.R. (1998) Fault-Related Rocks. A Photographic Atlas - Princeton: Princeton University Press, p.617.
  47. Sonmez, H., Gokceoglu, C., Tuncay, E., Medley, E.W. and Nefeslioglu, H.A. (2004) Relationship between volumetric block proportion an overall UCS of a volcanic bimrock, Felsbau-Rock and Soil Engineering, v.22, p.27-34.
  48. Spry, A. (1969) Metamorphic Textures. London: Pergamon, p.350.
  49. Stewart, M., Holdsworth, R.E. and Strachan, R.A. (2000) Deformation processes and weakening mechanisms within the friction-viscous transition zone of major crustal-scale faults: insights from the Great Glen fault zone, Scotland. Journal of Structural Geology, v.22, p.543-560. https://doi.org/10.1016/S0191-8141(99)00164-9
  50. Storti, F., Billi, A. and Salvini, F. (2003) Particle size distributions in natural carbonate fault rocks. Earth and Planetary Science Letters, v.206, p.173-186. https://doi.org/10.1016/S0012-821X(02)01077-4
  51. Twiss, R.J. and Moores, E.M. (1992) Structural geology, W. H. freeman and Company, New York, p.532.
  52. Woodcock, N.H. and Mort, K. (2008) Classification of fault breccias and related fault rocks. Geological Magazine, v.145, p.435-440. https://doi.org/10.1017/S0016756808004883
  53. Yun, H.S., Moon, S.W. and Seo, Y.S. (2019) Relationship between shear strength and component content of fault cores, Economic and Environmental Geology, v.52, p.65-79. (in Korean with English abstract) https://doi.org/10.9719/EEG.2019.52.1.65
  54. Yun, H.S., Moon, S.W. and Seo, Y.S. (2015) Setting of the range for shear strength of fault cores in Gyeongju and Ulsan using regression analysis, Journal of Korean Tunnelling and Underground Space Association, v.17, p.127-140. (in Korean with English abstract) https://doi.org/10.9711/KTAJ.2015.17.2.127