Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Prediction of the Shaft Resistance of Pile Sockets

암에 근입된 말뚝의 주면저항력 예측

  • Seidel, J.P. (Foundation QA Pty. Ltd. and Associate, Monash Univ., Melbourne, Australia) ;
  • Cho, Chun-Whan (Piletech Consulting Engeg. Co. Ltd., Korea,)
  • Published : 2002.10.01
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Abstract

Empiricism has characterized the traditional methods of pile design; in essence, pile design recommendations are based on the accumulated knowledge of pile behaviour based on the construction and subsequent load testing of piles in soil and rock. In this paper, the traditional approaches to design of piles in rock will be briefly reviewed. It will be shown that the unrelated empirical relationships developed fur rock lead to considerable uncertainty in the design of piles. A new method for predicting the shaft resistance of piles socketed into rock, and based on fundamental principles is outlined. It is shown that the shaft resistance predictions of this method agree well with the field test data for rock and hard soil. It is demonstrated by way of a limited parametric study that shaft roughness and socket diameter are critical factors in the performance of piles constructed in these materials. The application of the method to piles socketed into the granites and gneisses of Korea is discussed by way of a case study and by reference to recent direct shear tests on these rocks.

기존의 말뚝 설계방법들은 시공 및 재하시험 결과들로부터 축적된 말뚝거동에 대한 경험을 바탕으로 이루어 졌다고 할 수 있다. 이와 같이 만들어진 암에 근입된 말뚝의 설계에 대한 전통적인 방법들에 대해 고찰한 결과, 암에 근입된 말뚝의 경험적인 설계방법들은 설계시 상당한 불확실성을 내포하는 것으로 나타났다. 따라서 본 논문에서는 암에 근입된 말뚝의 주면저항을 예측하는 새로운 방법에 대한 기본원리를 고찰하였다. 이 방법으로 예측한 말뚝의 지지력은 현장에서 측정한 결과와 잘 일치하는 것으로 나타났다. 제한된 변수연구 결과이지만 본 연구를 통해 암의 거칠기와 말뚝의 직경은 암반에 근입된 말뚝의 거동에 중요한 역할을 하는 것을 알 수 있었다 또한 국내 화강편마암에 대한 현장 사례연구를 통해 이방법의 적용성을 검토하였다.

Keywords

References

  1. Standard specifications for highway bridge($6^{th}$ ed.) AASHTO
  2. Report of Florida Dept. of Trans. Development of In-situ equipment for capacity determinations of deep foundations in Florida limestone Bloomquist, D.;Townsend, F.C.
  3. Canadian Foundation Engineering manual Canadian Geotechnical Society
  4. Analysis and design of drilled shaft foundations socketed into rock Carter, J.;Kulhawy, F.
  5. Report to Electric Power Res. Inst. Palo Alto, in prep. Case history evaluation of the behaviour of drilled shafts under axial and lateral loading Chan, Y.-J.;Kulhawy, F.H.
  6. Proc. Of The KGS Spring Conference 2002 Comparison of rock socketed pile design methods for shaft resistance Cho, C.W.;Lee, M.W.;Cho, Y.H.;Yoo, H.K.;Park, Y.S.
  7. Rock socketed piles: MMBW Highways Division Practice. Symp. on Rock Socketed Piles. Aust. Geomech. Soc. Vic. Group. Day, H.B.
  8. Rock mechanics in engineering practice Geological considerations. Deere, D.U.;Stagg, K.G.(ed.);Zienkiewicz, O.C.(ed.)
  9. Foundation and earth structures (Design Maunal 7.2) NAVFAC
  10. Drilled shaft FHWA;US DoT
  11. Pile design and construction GEO
  12. 5th Intl. Conf. and Exhibition of Piling and Deep Foundation Improving the capacity of piles in rock through the use of expansive cement additives Haberfield, C.M.;Baycan, S.;Seidel, J.P.
  13. General Report Proc. British Geotechnical Society Conf. on Settlement of Structures Settlement of foundations on rock Hobbs, N.B.
  14. Int. Jnl. Rock Mech. Min. Sci. & Geomech. Abstr. v.27 no.3 Estimating Mohr-Coulomb friction and cohesion values from the Hoek-Brown failure criterion Hoek, E. https://doi.org/10.1016/0148-9062(90)94333-O
  15. Jnl. Geotech. Engg. Div. ASCE v.106 Empirical strength criterion for rock masses Hoek, E.;Brown, E.T.
  16. Shaft resistance of rock-socketed drilled piers Horvath, R.G.;Kenney, T.C.
  17. Can. Geot. Jnl. v.20 Methods for Improving the Performance of Drilled Piers in Weak Rock Horvath, R.G.;Kenney, T.C.;Kozicki, P. https://doi.org/10.1139/t83-081
  18. PhD Thesis, Seoul Nat. University Analysis of Vertical and Horizontal Resistance Behavior of Cast in situ Concrete Piles in Completely Weathered Granite Gneiss Jeon, K.S.
  19. G$\'{e}$otechnique v.37 no.1 Constant normal stiffness direct shear testing for socketed pile design in weak rock Johnston, I.W.;Lam, T.S.K.;Williams, A.F.
  20. Intl. Symp. on Hard Soils - Soft Rocks. Cyclic Constant Normal Stiffness Direct Shear Testing of Soft Rock Johnston, I.W.;Seidel, J.P.;Haberfield, C.M.
  21. Proc. 6th ANZ Conf. on Geomechanics Analytical predictions for side resistance of piles in rock Kodikara. J.K.;Johnston, I.W.;Haberfield, C.M.
  22. Design Code of Rail Road Korea Rail Road Office
  23. Design Code of Bridge Foundation Korea Society of Civil Engineers
  24. Foundation Engineering Design Manual Korean Geotechnical Society
  25. Proc. on Conf. on design and performance of deep foundation: piles and piers in soil and soft rock no.38 Drilled shaft side resistance in clay soil to rock. Kulhawy, F.H.;Phoon, K.K.
  26. Hong Kong Engineer Side resistance of a rock-socketed caisson Lam, T.S.K.;Yau, J.H.W.;Premchitt, J.
  27. Jnl. Geotech. Eng. (ASCE) v.118 no.10 Design of socketed drilled shafts in limestone McVay, M.C.;Townsend, F.C.;Williams, R.C. https://doi.org/10.1061/(ASCE)0733-9410(1992)118:10(1626)
  28. Aust. Geomech. Jnl. v.98 Design Loadings for Foundations on Shale and Sandstone in the Sydney Region Pells, P.J.N.;Douglas, D.J.;Rodway, B.;Thorne, C.;McMahon, B.K.
  29. Intl. Conf. on Structural Foundations on Rock An Experimental Inverstigation into Side Shear for Socketed Piles in Sandstone Pells, P.J.N.;Rowe, R.K.;Turner, R.M.
  30. Interim research report (unpubliched) A new improved design method for drilled shaft in rock Piletech Co.;Hanyang Univ.
  31. Report GEOT-11-84 The design of piles socketed into weak rock Rowe, R.K.;Armitage, H.H.
  32. PhD. Dissertation, Monash University The analysis and design of pile shafts in weak rock Seidel, J.P.
  33. Rocket for Windows v2.0 Users Manual Seidel, J.P.
  34. US FHWA Intl. Conf. on Design and Construction of Deep Foundations A New Approach for the Prediction of Drilled Pier Performance in Rock Seidel, J.P.;Haberfield, C.M.
  35. Int. Jnl. Rock Mech. and Rock Engg Towards an understanding of joint roughness Seidel, J.P.;Haberfield, C.M.
  36. Concrete technology and practice. (1st ed.) Taylor, W.H.
  37. Geomechanics Soc., Inst. Engnrs. Aust. The allowable loadings of foundations on shale and Sandstone in the Sydney Region. Part 3. Field Test Results. Paper presented to Sydney Group of Aust. Thorne, C.P.
  38. PhD Dissertation, Monash University The design and performance of piles socketed into weak rock Williams, A.F.
  39. Proc. 3rd ANZ Conf. on Geomechanics v.1 The design and performance of cast-in-situ piles in extensively jointed Silurian mudstone Williams, A.F.;Ervin, M.C.
  40. Can. Geotech. Jnl. v.18 Side resistance rock sockets in sandstone, mudstone and shale Williams, A.F.;Pells, P.J.N. https://doi.org/10.1139/t81-061
  41. Intl. Conf. on Structural Foundations on Rock The design of socketed piles in weak rock Williams, A.F.;Johnston, I.W.;Donald, I.B.