Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
권호 표지
DOI QR코드

DOI QR Code

Estimation of In-situ Stress State for NC Clays Using PCPT Results

정규압밀 점토지반에서 피에조콘관입 결과를 이용한 원위치 응력상태 평가

  • Cho, Sung-Hwan (Dept. of Civil and Environmental Eng., Yonsei Univ.) ;
  • Seo, Kyung-Bum (Dept. of Civil and Environmental Eng., Yonsei Univ.) ;
  • Chang, Buhm-Soo (Dept. of Management, Korea Infrastructure Safety & Technologe Corporation) ;
  • Lee, Jun-Hwan (Dept. of Civil and Environmental Eng., Yonsei Univ.)
  • 조성환 (연세대학교 토목환경공학과) ;
  • 서경범 (연세대학교 토목환경공학과) ;
  • 장범수 (한국시설안전관리공단) ;
  • 이준환 (연세대학교 토목환경공학과)
  • Received : 2010.04.21
  • Accepted : 2010.10.04
  • Published : 2010.10.31
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, a method for estimating the in-situ stress state of NC clays using piezocone penetration test (PCPT) results is proposed. The proposed method is based on a correlation between the PCPT results and strength increment ratio. According to proposed method, no additional testing procedure for collecting undisturbed soil sample is required, which can reduce overall testing cost. To verify this method various analytical solutions were adopted and used. Measured result and predicted result are compared with each other. The verification sites consist of a variety of soil conditions. From the comparison, it is seen that predicted value of effective strcss using the proposed method match well those from measured results.

본 연구에서는 정규압밀된 점토지반에서 피에조콘관입시험 (PCPT) 결과를 이용하여 원위치 응력상태를 평가할 수 있는 방법을 제안하였다. 이를 위해 다양한 현장시험과 실내시험 결과를 분석하였으며, 현장시험에서 구해진 PCPT 결과값과 실내시험에서 얻어진 결과를 토대로 이론식을 산정하였다. 제안된 방법에서는 기존 방법에 포함되어 있던 불교란 시료 채취과정과 단위중량 결정을 위한 별도의 실험과정이 요구되지 않으며, PCPT 시험결과를 통해 유효응력의 추정이 가능하기 때문에, 조사과정에서의 비용이나 소요시간을 최소화 할 수 있다. 제안된 방법의 적용성 평가를 위하여 국내의 다양한 점성토 지반에서 수행된 피에조콘관입시험 결과를 수집하였으며, 이를 토대로 제안된 방법에 의한 결과와 기존방법의 결과와의 비교분석을 실시하였다. 분석결과, 예측된 결과는 측정된 결과와 유사함을 확인할 수 있었다.

Keywords

References

  1. 김창동, 김수일, 이준환 (2008), "유효콘계수를 이용한 포화점토의 비배수전단강도 평가", 한국지반공학회 논문집, 24권 11호, pp.133-141.
  2. 박영환, 김민기, 김창동, 이준환 (2007), "부산지역 점토의 비배수저단강도 평가를 위한 CPT 콘계수 해석 및 평가", 한국지반공학회 논문집, 23권 8호, pp.77-85.
  3. 부산지방해양수산청 (1999), 부산신항투기장 실시설계보고서: 해상지반조사편, 부산지방해양수산청.
  4. 송병관 (2006), "광양지역 점토의 지반 공학적 특성", 공학석사학위논문, 중앙대학교.
  5. 이선재 (1997), "피에조콘을 이용한 국내 지반의 공학적 특성 연구", 공학박사 학위논문, 서울대학교.
  6. 장인성, 이선재, 정충기, 김명모 (2001), "국내 점성토 지반의 피에조콘 계수", 한국지반공학회 논문집, 17권 6호, pp.15-24.
  7. 최충락 (2006), "서부산지역 연약지반의 공학적 특성 및 토질정수 상관관계", 공학석사 학위논문, 경희대학교.
  8. 홍성진, 이문주, 김태준, 이우진 (2009), "간극수압비를 이용한 부산점토의 CPTu 콘계수 추정", 한국지반공학회 논문집, 25권 1호, pp.77-88.
  9. 허건 (2007), "콘 관입시험(CPTu)을 이용한 입도분석 방법에 대한 연구", 공학석사 학위논문, 동아대 산업대학원.
  10. 현대건설 (2006) "광양항 3-2차 컨테이너 터미널 축조공사 재하성토 제거 검토보고서".
  11. Campanella, R. G.., Gillespie, D. G., and Robertson, P. K (1982), "Pore pressure during cone penetration testing", Proceedings of 2nd European Symposium on Penetration testing, Amsterdam, Vol.2, pp.507-512.
  12. Campanella, R. G., Robertson, P. K., Gillespie, D. G. and Greig, J. (1985), "Recent developments in in-situ testing of soils", Proceeding of 11th international conference on Soil Mechanics and Foundation Engineering, San Francisco, Vol.2, pp.849-854.
  13. Chen, B. S. T., and Mayne, P. W. (1993), "Piezocone evaluation of undrained shear strength in clays", Proceeding of 11th Southeast Asian Geotechnical Conference, Singapore, pp.91-98.
  14. Chen, B. S. Y., and Mayne, P.W. (1996), "Statistical relationships between piezocone measurements and stress history of clays", Canadian Geotechnical Journal, 33.
  15. Dobbie, M. J. (1988), "A study of cone penetration tests in the Singapore marine clay", Proceedings on 1st International Symposium on Penetration testing, Orlando, Vol.2, pp.177-190.
  16. Hansbo, S. (1994), "Foundation Engineering", Elsevier Science B.V. Amsterdam, The Netherlands, pp.89-91.
  17. Jamiolkovski, M., Lancellotta, R., Tordella, L. and Battaglio, M. (1982), "Undrained strength from CPT", Proceedings of 2nd European Symposium on Penetration Testing, Amsterdam, Vol.2, pp.599-606.
  18. Jamiolkowski, M., Ladd, C.C., Germaine, J.T., and Lancellotta, R. (1985), "New Developments in Field and Laboratory Testing of Soils, Theme Lecture", Proc. 11th Intl. Conf. on Soil Mech. and Found. Eng., San Francisco, Vol.1, pp.57-153
  19. Jones, S. R. (1995), "Engineering properties of alluvial soils in Newcastle using cone penetration testing", Engineering Geology of the Newcastle-Gosford Region, Australia Geomechanics Society.
  20. Karlsrud, K, Lunne, T. and Brattlieu, K. (1996), "Improved CPTU correlations based on block samples", Nordisk Geoteknikermote, Reykjavik.
  21. Kim, C. D., Kim, S. I., and Lee, J. H. (2009), "Estimating clay undrained shear strength using CPTu results", Geotechnical Engineering, Institution of Civil Engineers (ICE), Vol.162. Issue GE2, pp.119-127. https://doi.org/10.1680/geng.2009.162.2.119
  22. Kjesktad, O., Lunne, T. and Clausen, C. J. F. (1978), "Comparison Between In-situ Cone Resistance and Laboratory Strenth for Overconsoildated North Sea Clays", Marine Geotechnology, Vol.3, No.4.
  23. Konrad, J. M., Bozozuk, M. and Law, K T. (1985), "Study of in-situ test methods in deltaic silt", Proceedings of 11th International Conference on Soil Mechanics and Foundation Engineering, San Francisco, pp.879-866.
  24. Konrad, J. M., and Law, K. (1987), "Preconsolidation pressure from piezocone tests in marine clays", Geotechnique, 37(2).
  25. Lacasse, S. and Lunne, T. (1982), "Penetration tests in teo Norwegian clays", Proceedings of 2nd European Symposium on penetration Testing, Amsterdam, Vol.2, pp.661-669.
  26. Ladd C.C., Foott R., Ishihara K., Schlosser F. and Poulos H. G. (1977), "Stress-deformation and strength characteristics" Proceedings of the 9th International Conference on Soil Mechanics and Foundation Engineering, Tokyo, 1977, 2, pp.421-494.
  27. Lee, J. H., Seo, K. B., Kang, B. J. and Cho, S. H. (2010), "Application of effective cone factor for strength characterization of saturated clays", Geo Florida 2010, West palm beach, Florida, USA.
  28. Lunne, T., Christofferen, H.P. and Tjelta, T. I. (1985), "Engineering use of Piezocone Data in North Sea Clays", Proceedings of 11th International Conference on Soil Mechanics and Foundation Engineering, Sanfrancisco, Vol.2, pp.907-912.
  29. Lunne, T., Eide, O. and De Ruiter, J. (1976), "Correlation between cone resistance and vane shear strength in some Scandinavian soft to medium stiff clays", Canadian Geotechnical Journal, Vol.13, pp.430-441. https://doi.org/10.1139/t76-043
  30. Lunne, T., Robertson, P. K., and Powell, J.J.M. (1997), Cone Penetration Testing. E&FN SPON, London, UK.
  31. Marsland, A. (1974), "Comparison of the results from static penetration tests and large in-situ plate tests in London clay", BRE, CO87/74.
  32. Marsland, A. and Powell, J. J. M. (1979), "Evaluating the large scale properties of glacial clays for foundation design", Proceedings of BOOS, Vol.1, pp.193-214.
  33. Mayne, P. W., and Bachus, R. C. (1988), "Profiling OCR in clays by piezocone", Proceedings of the 1st International Symposium on Penetration Testing (I.S.O.P.T.), Orlando, Edited by J. DeRuiter. Vol.2.
  34. Mayne, P. W., and Holtz, R. D. (1988), "Profiling stress history from piezocone soundings", Soils and Foundations, 28(1).
  35. Mersi, G. (1989), "A re-evaluation of using laboratory shear tests", Can. Geotech. J., Vol.26, No.1, pp.162-164. https://doi.org/10.1139/t89-017
  36. Orihara, K., Ng, D. Y. and Voon, B. F. S. (1993), "Soil identification and engineering parameters determined from piezocone tests in Singapore Recent deposits", Proceeding of 11th Southeast Asian Geothechnical Conference, Singapore, pp.181-186.
  37. Robertson, P.K., and R.G. Campanella (1988), "Design Manual for Use of CPT and CPTu", Pennsylvania Department of Transportation (PennDot), pp.200.
  38. Rocha-filho, P. and Alenca, J. A (1985), "Piezocone tests in Rio de Janerio soft clay deposit", Proceeding of 11th International conference on Soil Mechanics and Foundation Engineering, San Francisco, pp.859-562.
  39. Schmertmann, J. H. (1978a), "Guidelines for Cone Penetration Test, Performance and design", Federal Highway Administration, Report FHWA-TS-78-209, Washington, pp.145.
  40. Senneset, K., Janbu, N. and Svan, G. (1982), "Strength and Deformation Parameters from Cone Penetrations Tests", Proceedings of the European Symposium on Penetration Testing, ESOPT II, Amsterdam, pp.863-870.
  41. Skempton, A.W. (1957), "Discussion : The Planning and Design of New Hong Kong Airport", Proc. Inst. Civil. Eng., Vol.7, pp.305-307. https://doi.org/10.1680/iicep.1957.2568
  42. Skempton, A.W. (1960), "Correspondence," Geotechnique, Vol.10, No.4, pp.186. https://doi.org/10.1680/geot.1960.10.4.186
  43. Tanaka, H. (1995), "National Report-the current state of CPT in Japan", Proceedings of International Symposium on Cone Penetration Testing, Vol.1, pp.115-124.
  44. Terzaghi. K. (1925), Erdbaumechanik auf Bodenphysikalischer Grundlage, Dueticke, Vienna
  45. Terzaghi, K. (1936), "Relation between soil mechanics and foundation engineering; Presidential Address", Proceedings, First International Conference on Soil Mechanics and Foundation Engineering, Boston, Vol3, pp.13-18.
  46. Wong, J. T. F. (1995), "Interpretation of in-situ tests in cohesive soils", 1st Year Progress Report on Graduate Study, Nanyang Technological University, Singapore.
  47. Wroth, C. P. (1984), "Interpretation of in-situ soil tests", Geotechnique, Vol. 34, No.4, Dec., pp.449-489. https://doi.org/10.1680/geot.1984.34.4.449