Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Evaluation of the Resistance Bias Factors to Develop LRFD for Gravel Compaction Piles

LRFD 설계를 위한 쇄석다짐말뚝공법의 저항편향계수 산정

  • Han, Yong-Bae (Dept. of Civil and Environmental Engineering, Dongguk University) ;
  • Park, Joon-Mo (Dept. of Geotechnical Engrg., Kun-Il Engrg. Co., LTD.) ;
  • Jang, Yeon-Soo (Dept. of Civil and Environmental Engineering, Dongguk University)
  • 한용배 (동국대학교 공과대학 건설환경공학과) ;
  • 박준모 ((주)건일엔지니어링) ;
  • 장연수 (동국대학교 공과대학 건설환경공학과)
  • Received : 2011.11.22
  • Accepted : 2012.02.22
  • Published : 2012.02.29
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Abstract

In this study, the resistance bias factors are calculated to determine the resistance factor of Gravel Compaction Piles which is one of the soft ground improvement methods. In order to calculate resistance bias factors for gravel compaction piles, two ultimate bearing capacities were analyzed. One is the ultimate bearing capacity in 2.54 cm settlement measured using data of the field loading test on 41 piles and the other is the ultimate bearing capacity calculated using the seven equations concerning bulging failure. The results of analysis show that the probability density function of the calculated ultimate bearing capacities has a lognormal distribution. Resistance bias factor and the coefficient of variation for Greenwood equation are 0.91 and 0.38, respectively, and for those of Hughes & Withers are 1.19 and 0.39. The two equations are suitable for calculating resistance factors for LRFD of soil improvement using gravel compaction piles.

본 연구에서는 연약지반개량공법의 하나인 쇄석다짐말뚝공법의 저항계수를 산정하기 위한 저항편향계수를 산정하였다. 쇄석다짐말뚝공법의 저항편향계수를 산정하기 위하여 국내외 현장에서 수행된 41개 말뚝의 재하시험 결과로부터 산출된 2.54cm 침하량기준의 극한지지력과 말뚝직경의 2~3배의 깊이에서 팽창파괴가 지배적인 파괴유형이므로 팽창파괴에 대한 7개의 극한지지력공식을 사용하여 저향편향계수를 분석한 결과 확률밀도함수는 쇄석다짐말뚝의 7개 팽창파괴에 대한 극한지지력식 모두 로그정규분포 형태를 보였고, 저항편향계수/변동계수는 Greenwood(1970) 제안식에서는 0.91/0.38, Hughes & Withers(1974) 제안식에서는 1.19/0.39로 팽창파괴에 대한 극한지지력식 중에서 저항계수설계법의 저항계수 산정 시 적합한 제안식으로 분석되었다.

Keywords

References

  1. 곽기석, 박재현, 최용규, 허정원 (2006), LRFD 설계를 위한 항타 강관말뚝의 저항편향계수 산정, 대한토목학회 논문집, 제26권 제5C호, pp.343-350.
  2. 김대호, 이준환, 김범주 (2005), CPT결과를 이용한 항타말뚝 지지력 평가를 위한 저항계수 산정, 한국지반공학회 논문집, 제21권 제10호, pp.113-122.
  3. 김홍택, 고용일, 강인규, 김진홍 (1997), Granular Group Pile의 팽창파괴에 대한 극한지지력의 평가, 한국지반공학회 추계학술발표회 논문집, pp.73-80.
  4. 윤홍준, 정성준, 김명모 (2007), 풍화암에 근입된 현장타설말뚝의 저항계수 산정, 한국지반공학회 논문집, 제23권 제8호, pp.107-116.
  5. 천병식, 김원철, 조양운 (2004), 단일 쇄석다짐말뚝의 지지력 예측방법에 대한 비교 연구, 한국지반환경공학회 논문집, 제5권 제1호, pp.55-64.
  6. 채종길, 박영목, 정민수 (2009), SCP개량지반상에 성토시공 시 최적설계에 관한 연구, 대한토목학회 논문집, 제29권 제6C호, pp.251-258.
  7. 한국건설기술연구원 (2008), LRFD 기초구조물 설계를 위한 저항계수 결정 연구, 국토해양부; 한국건설교통기술평가원.
  8. 허정원, 박재현, 김경준, 이주형, 곽기석 (2007), 국내 항타강관말뚝 설계법의 신뢰성 평가, 한국지반공학회 논문집, 제23권 제12호, pp.61-73.
  9. 해양수산부 (2005), 차세대 항만 설계기술 개발 - 항만설계기준 및 신뢰성 설계법을 중심으로 - (1-5단계 최종보고서), 해양수산부.
  10. AASHTO (2010), AASHTO LRFD Bridge Design Specifications, 6th Edition, AASHTO, Washington, DC.
  11. Ambily, A. P. and Gandhi, S. R. (2004), "Experimental and theoretical evaluation of stone column in soft clay", International Conference on Geosynthetics and Geo-environmetal Engineering, ICGGE-2004, IIT Bombay, INDIA, pp.201-206.
  12. Aoki, N. and de Allencar, D (1975), "An approximate method to estimate the bearing capacity of piles", Proceedings of 5th Pan-American Conference of Soil Mechanics and Foundation Engineering, Buenous Aires.
  13. Barksdale, R. D. and Bachus, R. C. (1983), "Design and construction of stone columns", National Technical Information Service, Vol.1, Report No.FHWA/RD-83/026, Springfield, Virginia.
  14. Brauns, J. (1978), "Die anfangstraglast von schottersauen im bingigen untergrund", Die bautechink, Vol.8, pp.263-271.
  15. Bustamante, M. and Gianeselli, L. (1982), "Pile bearing capacity prediction by means of static penetrometer CPT", Proceedings of 2nd European Symposium on Penetration Testing, Amsterdam, pp.493-500.
  16. Carter, J. P. and Kulhawy, F. W. (1987), Analysis and design of foundations socketed into rock, Research Report 1493-4, Geotechnical Engineering Group, Cornell University Ithaca, New York.
  17. CEN (2004), EN 1997-1 Eurocode 7: Geotechnical Design-General Rules, European Committee for Standardization.
  18. Chakravarti, L. and Roy (1967), Handbook of Methods of Applied Statistics, Vol. I, John Wiley and Sons, pp.392-394.
  19. CSA (2006), CAN/CSA-S6-06: Canadian Highway Bridge Design Code, Canadian Satandard Association.
  20. Datye, K. R. and Nagaraju, S. S. (1981), "Design approach and field control for stone columns", Proceedings 10th International Conference on Soil Mechanics and Foundation Engineering, Stockholm, Vol.3, pp.637-640.
  21. Davisson, M. (1972), "High capacity Piles", Proceedings of The Lecture Series on Innovations in Foundation Construction, ASCE, Illinois Section, Chicago, pp.81-112.
  22. Fellenius, B. H. (1980), "The analysis of results from routine pile load test", Ground Engineering, London, Vol.13, No.6, pp.19-31.
  23. Gibson, R. E. and Anderson, W. F. (1961), "Insitu measurement of soil properties with the pressuremeter", Civil Engineering, London, Vol.56, pp.615-620.
  24. Greenwood, D. A. (1970), "Mechanical improvement of soils below ground surface", Proceedings of the Ground Engineering Conference, Institution of Civil Engineers, London, pp.11-22.
  25. Hansbo, S. (1994), Foundation Engineering, Developments in Geotechnical Engineering, Elsevier Press, Vol.95, pp.450-455.
  26. Horvath, R. G. and Kenny, T. C. (1979), "Shaft resistance of rock-socketed drilled piers", Drilled shaft design and construction in Florida, Department of Civil Engineering, University of Florida, Gainesville.
  27. Hu, W., Wood, D. M. and Srewart, W. (1997), "Ground improvement using stone column foundation: Results of model test", International Conference on Ground Improvement Techniques, pp.264-256.
  28. Hughes, J. M. O. and Withers, N. J. (1974), "Reinforcing of soft cohesive soils with stone column", Ground Engineerng, Vol.7, No.3, pp.42-49.
  29. Juran, I. and Guermazi, A. (1988), "Settlement response of soft soils reinforced by compacted sand columns", Journal of Geotechnical & Geoencironmental Engineering, ASCE, Vol.114, Issue 8, pp.930-943. https://doi.org/10.1061/(ASCE)0733-9410(1988)114:8(930)
  30. Kitazume, M. and Nagao, T. (2007), "Studies of reliability based design on sand compaction pile improved ground", Report of the port and airport research institute, Vol.46, No.1, pp.45-70.
  31. LCPC-SETRA (1985), Regles de justificaton des foundations sur pieux a partir des resultats des essais pressiometriques, Ministre de L'Urbanisme du logement et des Transports, Paris.
  32. Matsuo, M. and Suzuki, H. (1983), "Study on reliability-based design of improvement of clay layer by sand compaction piles", Soils and Foundations, Japanese Geotechnical Society, Vol.23, NO.3, pp.112-122. https://doi.org/10.3208/sandf1972.23.3_112
  33. Madhav, M. R., Iyengar, N. G. R., Vitkar, R. P. and Nandia, A. (1979), "Increased Bearing Capacity and Reduced Settlements Due to Inclusions in Soil", Proceedings of the International Conference on Soil Reinforcement: Reinforced Earth and Other Techniques, Vol.II, Paris, pp.329-333.
  34. Nowak, A. S. (1999), NCHRP Report 368: Calibration of LRFD Bridge Design Code, Transportation Research Board, National Research Council, Washington, D.C.
  35. Okahara, M., Fukui, J., Shirato, M., Matsui, K., and Honjo, Y. (2003), "National Report on Geotechnical Codes in Japan.", Proceedings of the 12th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, Singapore.
  36. O'Neill, M., Townsend, F., Hassan, K., Buller, A. and Chang, P. (1996), Load transfer for drill shafts in intermediate geo-material, FHWA-RD-95-172.
  37. Paikowsky, S. G. (2004), NCHRP Report 507: Load and Resistance Factor Design (LRFD) for Deep Foundations, Transportation Research Board of the National Academies, Washington, DC.
  38. Paikowsky, S. G. (2010), NCHRP Report 651: LRFD Design and Construction of Shallow Foundations for Highway Bridge Structures, Transportation Research Board of the National Academies, Washington, DC.
  39. Philipponnat, G. (1980), "Methode prtique de calculd'un pieu isole a l'aide de penetrometre statique", Revue Francaise de Geotechnique, Vol.10, pp.55-64.
  40. Ranjan, G. and Rao, B. G. (1986), "Granular piles for ground improvement", Proceedings of the 1st International Conference on Piling and Deep Foundations, Beijing, Vol.1.
  41. Rowe, R. K. and Armitage, H. H. (1987), "A design method for drilled piers in soft rock", Canadian Geotechnical Journal, Vol.24, pp.126-142. https://doi.org/10.1139/t87-011
  42. Saha, S. (1992), "Design approach and performance of stone columns". Proceedings of the Indian Geotechnical Conference, Calcutta, pp.195-198.
  43. Schmertmann, J. H. (1978), Guidelines for Cone Penetration Test, Performance and Design, U.S Dept. of Transportation, FHWATS-78-209.
  44. Snedecor, G. W. and Cochran, W. G. (1989), Statistical Methods, 8th Edition, Iowa State University Press.
  45. Vesic, A. S. (1972), "Expantion of cavities in infinite soil mass", Journal of Soil Mechanics and Foundation, ASCE, Vol.98, SM 3, pp.265-290.
  46. Zhang, L. and Einstein, H. H. (1988), "End bearing capacity of drilled shafts in rock", Journal of Geotechnical and Geoenvironmental Engineering, Vol.124, No.7, pp.574-584.
  47. Zhang, L. (2003). "Limit State Design Experiences in Hong Kong and Mainland China", Proceedings of the 12th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, Singapore.

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