All Issue

2018 Vol.34, Issue 12 Preview Page
December 2018. pp. 83-92
Abstract

사면 구조물은 시간이 경과함에 따라 대상지반에서 각종 열화 현상이 진행되어 내구성의 저하로 인한 붕괴가 발생할 수 있으며, 사용 연한을 감소시키는 결과를 초래하게 된다. 이러한 지반 열화에 따른 사면안정에 대한 접근방안은 지반의 물리적 특성 및 기하학적인 구조에 국한하여 분석하는 기존의 한계 평형 해석과는 또 다른 개념이라 할 수 있다. 본 연구에서는 사면의 열화 특성과 관련하여 각종 문헌 조사를 통하여 비교분석을 수행하고, 전단강도 저감에 대한 최적의 제안식들로서 지수함수, 로그함수 및 역쌍곡선 함수를 제시하고, 열화에 취약한 양산 단층대의 셰일층에서 붕괴가 발생한 경부고속철도 절토사면을 대상으로 사례분석을 실시하였다. 본 연구에서는 사례분석을 통하여 향후 열화로 인한 사면 안전성과 관련하여 정량적인 평가를 위한 최적의 강도 저하 곡선을 도출하고 한계평형해석에 의한 안정해석을 할 수 있는 접근 방법을 제시하였다.

The lapse of time may cause in the slope structure various deterioration phenomenon progresses in the ground of slope, and collapse due to deterioration of strength, resulting in a decrease in the service life. The approach to slope stability due to the ground deterioration is a different concept from the existing limit equilibrium analysis, which is limited to the physical characteristics and geometrical structure of ground. In this study, we conducted a comparative analysis of various literature studies related to the slope failure characteristics and behaviors to presented the optimal formulas for shear strength reduction, such as the exponential function, the logarithmic function and the inverse hyperbolic function. And then a case study was performed on cut slope of Gyeongbu High Speed Rail construction site along the Yangsan fault zone, where the slope failure of shale layer vulnerable to deterioration occurred. As a result, it was confirmed that landslide occurred due to reduction of shear strength by deterioration, as safety factor is approx. 1.0 at the time when the slope failure occurred. Based on the comprehensive case study, as a quantitative approach to the evaluation of slope stability due to deterioration of ground, finally we propose a method for evaluating slope stability with optimal strength reduction curves.

References
  1. Fookes, P.G., Gourley, C.S., and Ohikere, O. (1988), "Rock Weathering in Engineering Time", Quarterly Journal of Engineering Geology and Hydrogeology, 21(1): pp.33-57・February 1988.
  2. Geological Society Engineering Group Working Party Report (1995), "The Description and Classification of Weathered Rocks for Engineering Purposes", Quarterly Journal of Engineering Geology, The Geological Society, 28, pp.207-242.
  3. GEO-SLOPE (2018), "SLOPE/W Computer Program for Slope Stability Analysis", GEO-SLOPE International, Ltd.
  4. Hagros, A., Johansson, E., and Hudson, J.A. (2007), "Time dependency in the mechanical properties of crystalline rocks: a literature survey", Possiva OY, Finland. 1. Huisman, M., Hack, H.R., and Nieuwenhuis, J. (2006), "Predicting Rock Mass Decay in Engineering Lifetimes: The Influence of Slope Aspect and Climate", Environmental and Engineering Geoscience; 12, 1; pp.39-52.
  5. Huisman, M., Hack, H.R., and Nieuwenhuis, J. (2006), "Predicting Rock Mass Decay in Engineering Lifetimes: The Influence of Slope Aspect and Climate", Environmental and Engineering Geoscience; 12, 1; pp.39-52.10.2113/12.1.39
  6. Huisman, M. (2006), "Assessment of rock mass decay in artificial slopes", PhD Dissertation, Technische Universiteit Delft.
  7. Jiang, Y., Guan, Z., and Tanabashi, Y. (2007), "Delayed Deformation Analyses for Mountain Tunnels", The Second Half Century of Rock Mechanics, 11th Congress of the International Society for Rock Mechanics, Lisbon, July 2007, Vol.2, pp.825-828.
  8. Kang, S.M. (2009), "Geochemical Weathering Deterioration of Rock and Environmental Assessment", Dissertation, Andong National University.
  9. Kim, N.Y. (2013), "Cases on Tunnel and Slope Collapse Caused by the Fault Zone", Q&A, Journal of KSCE, 61(1), pp.124-128.
  10. Ladanyi, B. (1974), "Use of the Long-term Strength Concept in the Determination of Ground Pressure on Tunnel Linings", In: 3rd Congr. Int. Soc. Rock Mech., Denver, Vol.2B, pp.1150-1156.
  11. Maekawa, H. and Miyakita, K. (1991), "Effects of Repetition of Drying and Wetting on Mechanical Characteristics of a Diatomaceous Mudstone", Soils and Foundation, Vol.31, No.2, June 1991, pp.117-133.10.3208/sandf1972.31.2_117
  12. Matsunaga, T. (2008), "Study on Prediction of Tunnel Deformation and Rationalization of Measures", PhD These, Kyoto University.
  13. Mochizuki, A., Ma, X. and Sokkheang, S. (2011), "Failure of a Cut Slope and Deterioration of Shear Strength due to Weathering", Proceeding of TC302 Symposium Osaka 2011 : International Symposium on Backwards Problem in Geotechnical Engineering and Monitoring of Geo-Construction (2011), pp.154-161.21346081PMC3611450
  14. Morgenstern N.R. and Eigenbrod K.D. (1974), "Classification of Argillaceous Soils and Rocks", dour Soil Mech. and Found. Eng., ASCE, Vol.100, No.GT10, pp.1137-1156.
  15. Momeni, A., Hashemi, S.S., Khanlari, G.G. and Heidari, M. (2017), "The Effect of Weathering on Durability and Deformability Properties of Granitoid Rocks", Bulletin of Engineering Geology and the Environment, August 2017, Volume 76, Issue 3, pp.1037-1049.10.1007/s10064-016-0999-7
  16. Norwick, S. A. and Dexter, L. R. (2002), "Rates of Development of Tafoni in the Moenkopi and Kaibab Formations in Meteor Crater and on the Colorado Plateau, northeastern Arizona", Earth Surf. Process. Landforms, Vol.27, pp.11-26.10.1002/esp.276
  17. Ollier, C. (1984), "Weathering", 2nd ed. Longman, Geomorphology Texts, London and New York. 270p.PMC459800
  18. Oguchi, C. T., Hatta, T., and Matsukura, Y. (1994), "Changes in Rock Properties of Porous Rhyolite through 40,000 Years in Kozu-shima, Japan", Geog. Rev. Japan, Vol.67A, pp.775-793 (in Japanese with English abstract).10.4157/grj1984a.67.11_775
  19. Park, B. S., Cho, H., Youn, S. P. and Park, D. I. (2016), "Analysis and evaluation of stability for the reactivated landslide along deep seated weakness zones", International Journal of Geo-Engineering, Volume 7, Paper no. 3, DOI 10.1186/s40703-016-0016-9
  20. Price, I. R. and Velbel, M. A. (2003), "Chemical Weathering Indices Applied to Weathering Profiles Developed on Heterogeneous Felsic Metamorphic Parent Rocks", Chem. Geol., Vol.202, pp.397-416.10.1016/j.chemgeo.2002.11.001
  21. Pye, K. and Miller, J. A. (1990), "Chemical and Biochemical Weathering of Pyrite Mudrocks in a Shale Embankment", Quarterly Journal of Engineering Geology, 23, pp.365-381.10.1144/GSL.QJEG.1990.023.04.11
  22. Sandrone, F. and Labiouse, V. (2010), "Analysis of the Evolution of Road Tunnels Equilibrium Conditions with a Convergence–Confinement Approach", Rock Mechanics and Rock Engineering, March 2010, Volume 43, Issue 2, pp.201-218.10.1007/s00603-009-0056-y
  23. Sato, M., Takeda, N., and Kamemura, K. (1983), "Numerical Analysis of Rock behaviour Considering Time-dependent Strength", Japanese Geotechnical Society, pp.817-820 (in Japanese).
  24. Selby, M. J. (1993), "Hillslope Materials and Processes", 2nd edn, Oxford University Press, Oxford.
  25. Shinjo, T. and Ito, T. (1989), "Slope excavation, In Recent Advances in Soft Rock Research", Rept. of ISSMFE Tech. Com. Soft Rocks and Ind. Soils and Proc. Disc. Ses. 5, Rio de Janeiro, Brazil, pp. 31-43.
  26. Sunamura, T. (1996), "A Physical Model for the Rate of Coastal Tafoni Development", The Jour. of Geol., Vol.104, pp.741-748.10.1086/629866
  27. Sungjee Construction Co. (2008), "Report on stability assessment for tunnel under express highway", Section 12-4, Construction of Gyeongbu High Speed Rail: Phase Two (II).
  28. Tating, F., Hack, R., and Jetten, V. (2013a), "Engineering Aspects and Time Effects of Rapid Deterioration of Sandstone in the Tropical Environment of Sabah, Malaysia", Engineering Geology 159 (2013) pp.20-30.10.1016/j.enggeo.2013.03.009
  29. Tating, F., Hack, R., and Jetten, V. (2013b), "Weathering and Deterioration as Quantitative Factors in Slope Design in Humid Tropical Areas; Case Study Northern Kota Kinabalu, Sabah, Malaysia", Ingeokring Newsletter. 33. ISSN: 1384-1351, pp.22-28.
  30. Utili, S. (2004), "Evolution of Natural Slopes Subject to Weathering an Analytical and Numerical Study", PhD Dissertation, Milan University of Technology.
  31. Utili, S. (2005), "An Analytical Relationship for Weathering Induced Slope Retrogression: A Benchmark", Rivista Italiana Di Geotecnica 2/2005, pp.9-30.
  32. Walkinshaw, J.L. and Santi, P.M. (1996), "Landslide: Investigation and Mitigation, Chapter 21- Shales and Other Degradable Materials", Transportation Research Board Special Report, Issue Number: 247, pp.555-576.PMC2352520
  33. Yoshida, N., Nishi, M., Kitamura, M., and Adachi, T. (1997), "Analysis of Mudstone Deterioration and its Effect on Tunnel Performance", International Journal of Rock Mechanics and Mining Sciences, Volume 34, Issues 3-4, April-June 1997, pp.353-353.10.1016/S1365-1609(97)00289-X
  34. Yoshida, N., Morgenstern, N.R., and Chart, D.H. (1990), "A Failure Criterion for Stiff Soils and Rocks Exhibiting Softening", Can. Geotech. dour, Vol.27, pp.195-229.10.1139/t90-023
  35. Yoshida, N. and Adachi, T. (1994), "F.E. Analysis of Strength Deterioration in Stiff Clays and Mudstones Upon Excavation", jour. Japan Soc. Dam Eng., No.13, pp.14-28.
Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 34
  • No :12
  • Pages :83-92
  • Received Date :2018. 11. 05
  • Accepted Date : 2018. 12. 07