Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
권호 표지
DOI QR코드

DOI QR Code

Shaft Resistance Characteristics of Rock-Socketed Drilled Shafts Based on Pile Load Tests

현장 말뚝재하시험을 통한 암반에 근입된 현장타설말뚝의 주면마찰력 결정

  • Published : 2007.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

Behavior of rock-socketed drilled shafts subjected to axial load was investigated on the basis of pile load tests. The emphasis was laid on analyzing the shear load transfer characteristics from the shafts to surrounding rock. Field load tests were performed on nine test shafts under various conditions such as weathering of rock mass, borehole roughness, pile diameters, and loading directions. The borehole roughness at each test site was profiled using a laser borehole profiler. In order to evaluate and to propose ultimate shaft resistance($f_{max}$) of drilled shafts in rock of Korean peninsular, also, database of pile load tests was developed by reviewing various literature and technical reports.

암반에 근입된 현장타설말뚝의 주면거동특성을 분석하고자, 편마암질의 풍화암/연암지역에서 현장 말뚝재하시험(압축재하 4회, 인발시험 5회)을 수행하였다. 이를 통해 암반 풍화, 굴착면 거칠기, 말뚝 직경, 재하방향 등의 요소들이 암반 근입 현장타설말뚝의 주면 전단거동을 결정짓는 주요요소임을 확인할 수 있었다. 본 연구에서는 국내에서 수행된 암반 근입 현장타설말뚝의 재하시험 사례를 토대로 국내 암반조건을 반영한 극한주면마찰력($f_{max}$)을 제안하였다.

Keywords

References

  1. AASHTO (1996), 'Standard Specifications for Highway Bridges', Sixteenth Edition, American Association of State Highway and Transportation Officials, Washington, D. C
  2. Boresi, A. P. (1965), 'Elasticity in engineering mechanics', PrenticeHall, Englewood Cliffs, N.J
  3. Canadian Geotechnical Society (1992), 'Canadian Foundation Engineering Manual', 3rd Edition, BiTech Publishers, Vancouver, BC
  4. Carter, J.P. and Kulhawy, F.H. (1988), Analysis and design of drilled shaft foundations socketed into rock, Final report, EL 5918/ Project 1493-4 / Electric Power Research Institute, Conell Univ., Ithaca, NY
  5. FHWA (1999), 'Drilled Shafts: Construction Procedures and Design Methods', FHWA Publication No. FHWA-IF-99-025. Department of Transportation, Federal Highway Administration, Office of Implementation, McLean, VA
  6. Horvath, R. G., Kenny. T. C, and Kozicki, p. (1983), 'Method of improving the performance of drilled piers in weak rock', Canadian Geotechnical Journal, Vol.20, pp.758-772 https://doi.org/10.1139/t83-081
  7. International Society for Rock Mechanics (1981), 'Suggested Methods for the Quantitative Description of Discontinuities in Rock Masses', Pergamon Press, UK
  8. Johnston, I. W. and Lam, T. S. K. (1989), 'Shear behaviour of regular triangular concrete/rock joints-analysis', ASCE Journal of Geotechnical Engineering, Vol.115(5), pp.711-727 https://doi.org/10.1061/(ASCE)0733-9410(1989)115:5(711)
  9. Kim, S. I., Jeong, S. S., Cho, S. H., and Park, I. J. (1999), 'Shear Load Transter Characeteristics of Drilled Shafts in Weathered Rocks', Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol.125(11), pp.999-1010 https://doi.org/10.1061/(ASCE)1090-0241(1999)125:11(999)
  10. Lam T. S. K. (1983), 'Shear behaviour of grouted piles in offshore foundations', Ph.D. Thesis, University of Sydney
  11. Nam, M. S. (2004), 'Improved design for drilled shafts in rock', University of Houston, Dissertation
  12. NAVFAC (1982), 'Foundation and Earth Structures (Design Manual 7.2)', Department of The Naval Facilities Engineering Command
  13. O'Neill, M.W., Townsend, F.C., Hanssan, K.M., Buller, A., and Chan, P.S. (1996), Load transfer for drilled shafts in intermediate geomatrials, FHWA-RD-95-l72 Draft report U.S. Department of Transportation
  14. Ooi, L. H. (1989), 'The interface behaviour of socketed piles', Ph. D. Thesis, University of Sydney
  15. Seidel, J. P., and Haberfield,C.M. (1995), 'The axial capacity of pile sockets in rocks and hard soils. Ground Engineering', Vol.28(2), pp.33-38
  16. Rowe, R.K., and Armitage, H.H. (1984), The design of piles socketed into weak rock. Report GEOT-11-84, University of Western Ontario, London, Ont
  17. Seidel, J. P. and Collingwood, B. (2001), 'A new socket roughness factor for prediction of rock socket shaft resistance', Canadian Geotechnical Journal, Vol.38(1), pp.138-153 https://doi.org/10.1139/cgj-38-1-138
  18. Seol, H. I., Jeong, S. S., Lee, G. H., Kim, Z. C, and Lee, Y. G. (2006), 'Load-settlement characteristics of offshore drilled shafts using static bi-directional loading test', Proc. of Int. Offshore and Polar Engineering Conf., ISOPE, San Francisco, pp.508-5l4