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Centrifuge modelling of rock-socketed drilled shafts under uplift load

  • Park, Sunji (Centre for Offshore Foundation Systems, The University of Western Australia) ;
  • Kim, Jae-Hyun (Department of Civil Engineering, Kangwon National University) ;
  • Kim, Seok-Jung (Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology (KICT)) ;
  • Park, Jae-Hyun (Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology (KICT)) ;
  • Kwak, Ki-Seok (Underground Space Safety Research Center, Korea Institute of Civil Engineering and Building Technology (KICT)) ;
  • Kim, Dong-Soo (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST))
  • 투고 : 2021.01.12
  • 심사 : 2021.02.16
  • 발행 : 2021.03.10

초록

Rock-socketed drilled shafts are widely used to transfer the heavy loads from the superstructure especially in mountainous area. Extensive research has been done on the behavior of rock-socketed drilled shafts under compressive load. However, little attention has been paid to uplift behavior of drilled shaft in rock, which govern the overall behavior of the foundation system. In this paper, a series of centrifuge tests have been performed to investigate the uplift response of rock-socketed drilled shafts. The pull-out tests of drilled shafts installed in layered rocks having various strengths were conducted. The load-displacement response, axial load distributions in the shaft and the unit skin friction distribution under pull-out loads were investigated. The effects of the strength of rock socket on the initial stiffness, ultimate capacity and mobilization of friction of the foundation, were also examined. The results indicated that characteristics of rock-socket has a significant influence on the uplift behavior of drilled shaft. Most of the applied uplift load were carried by socketed rock when the drilled shaft was installed in the sand over rock layer, whereas substantial load was carried by both upper and lower rock layers when the drilled shaft was completely socketed into layered rock. The pattern of mobilized shaft friction and point where the maximum unit shaft friction occurred were also found to be affected by the socket condition surrounding the drilled shaft.

키워드

참고문헌

  1. AASHTO (2007), LRFD Bridge Design Specifications, American Association of State Highway and Transportation Officials.
  2. Ashour, M. and Abbas, A. (2020), "Response of piles in multilayers of soil under uplift forces", Int. J. Geomech., 20(6), 04020056. https://doi.org/10.1061/(ASCE)GM.1943-5622.0001676.
  3. ASTM (2006), D4254-00: Standard test method for minimum index density and unit weight of soils and calculation of relative density, ASTM International, West Conshohoken, Pennsylvania, U.S.A.
  4. ASTM (2007), D3689-07: Standard Test Methods for Deep Foundations Under Static Axial Tensile Load, ASTM International; West Conshohoken, Pennsylvania, U.S.A.
  5. ASTM (2007), D1557 07: Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort, ASTM International, West Conshohoken, Pennsylvania, U.S.A.
  6. ASTM (2014), D4254-14: Standard Test Methods for Maximum Index Density and Unit Weight of Soils Using a Vibratory Table, STM International; West Conshohoken, Pennsylvania, U.S.A.
  7. Carter, J.P. and Kulhawy, H. (1988), "Analysis and design of drilled shaft foundations socketed into rock", No. EPRI-EL5918, Electric Power Research Inst., Palo Alto, California, U.S.A., Cornell University, Ithaca, New York, U.S.A.
  8. Chang, C., Zoback, M.D. and Khaksar, A. (2006), "Empirical relations between rock strength and physical properties in sedimentary rocks", J. Petrol. Sci. Eng., 51(3-4), 223-237. https://doi.org/10.1016/j.petrol.2006.01.003.
  9. Chellis, R.D. (1961), Pile Foundations, McGraw-Hill, New York, U.S.A.
  10. Dykeman, P. and Valsangkar, A. (1996), "Model studies of socketed caissons in soft rock", Can. Geotech. J., 33(5), 747-759. https://doi.org/10.1139/t96-100-321.
  11. El Naggar, M.H. and Wei, J.Q. (2000), "Uplift behaviour of tapered piles established from model tests", Can. Geotech. J., 37(1), 56-74. https://doi.org/10.1139/t99-090.
  12. FHWA (2007), LRFD Bridge Design Specifications, FHWA-NHI15-047, Federal Highway Administration.
  13. Fuller F.M. (1983), Engineering of Pile Installations, McGrawHill, New York, U.S.A.
  14. Gaaver, K.E. (2013), "Uplift capacity of single piles and pile groups embedded in cohesionless soil", Alexandria Eng. J., 52(3), 365-372. https://doi.org/10.1016/j.aej.2013.01.003.
  15. Gao, F., Yan, W. and Ge, F. (2010), "Geotechnical investigation and tension-pile solution for foundation of SFT prototype at Qiandao Lake", Procedia Eng., 4, 127-134. https://doi.org/10.1016/j.proeng.2010.08.015.
  16. Goel, S. and Patra, N.R. (2007), "Prediction of load displacement response of single piles under uplift load", Geotech. Geol. Eng., 25(1), 57-64. https://doi.org/10.1007/s10706-006-0006-3.
  17. Hirany, A. and Kulhawy, F.H. (1988), "Conduct and interpretation of load tests on drilled shaft foundations: Volume 1, Detailed guidelines", Report EL-5915-V1, Electric Power Research Institute.
  18. Horvath, R.G. and Kenney, T.C. (1979), "Shaft resistance of rocksocketed drilled piers", Proceedings of the Symposium on Deep Foundations, Atlanta, Georgia, U.S.A., October.
  19. IEEE (2001), Std 691-2001: IEEE guide for transmission structure foundation design and testing, The Institute of Electrical and Electronics Engineers, New York, U.S.A.
  20. Kim, D.S., Kim, N.R., Choo, Y.W. and Cho, G.C. (2013), "A newly developed state-of-the-art geotechnical centrifuge in Korea", KSCE J. Civ. Eng., 17(1), 77-84. https://doi.org/10.1007/s12205-013-1350-5.
  21. Kim, J.H., Choo, Y.W., Kim, D.J. and Kim, D.S. (2016), "Miniature cone tip resistance on sand in a centrifuge", J. Geotech. Geoenviron. Eng., 142(3), 04015090. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001425.
  22. Kim, Y. and Rosher, L.T. (2019), "Performance of novel dynamic installed anchors during installation and monotonic pullout", Geomech. Eng., 18(2), 153-159. http://doi.org/10.12989/gae.2019.18.2.153.
  23. Kishida, H. and Uesugi, M. (1987), "Tests of the interface between sand and steel in the simple shear apparatus", Geotechnique, 37(1), 45-52. https://doi.org/10.1680/geot.1987.37.1.45.
  24. Korea Institute of Civil Engineering and Building Technology (KICT) (2017), 2017 Standard Estimation System, Ministry of Land, Infrastructure and Transport, Sejong City, South Korea.
  25. Kulhawy, F.H. and Carter, J.P. (1992), Socketed Foundations in Rock Masses, in Engineering in Rock Masses, Butterworth-Heinemann, Oxford, U.K.
  26. Kulhawy, F.H. (1991), Drilled Shaft Foundations in Foundation Engineering Handbook, Springer, Boston, Massachusetts, U.S.A.
  27. Kulhawy, F.H. (2004), "On the axial behavior of drilled foundations", Proceedings of the GeoSupport Conference 2004, Orlando, Florida, U.S.A., January.
  28. Lee, M.H., Cho, C.H., Yoo, H.K. and Kwon, H.K. (2003), "A study on the surface roughness of drilled shaft into rock in Korea", Proceedings of the Korean Geotechnical Society Conference, Seoul, South Korea, January.
  29. Leung, C.F. and Ko, H.Y. (1993), "Centrifuge model study of piles socketed in soft rock", Soils Found., 33(3), 80-91. https://doi.org/10.3208/sandf1972.33.3_80.
  30. Livneh, B. and El Naggar, M.H. (2008), "Axial testing and numerical modeling of square shaft helical piles under compressive and tensile loading", Can. Geotech. J., 45(8), 1142-1155. https://doi.org/10.1139/T08-044.
  31. Park, S. (2018), "Evaluation of uplift behavior for drilled shaft socketed into rock via centrifuge model tests", Master Thesis, Korea Advanced Institute of Science and Technology, Daejeon, Korea
  32. Prakash, S. and Sharma, H.D. (1990), Pile Foundations in Engineering Practice, John Wiley & Sons, Hoboken, New Jersey, U.S.A.
  33. Pu, S., Zhu, Z. and Wei, W. (2020), "A method for calculating the ultimate bearing capacity of uplift piles in combined soil and rock mass", Eur. J. Environ. Civ. Eng., 1-26. https://doi.org/10.1080/19648189.2020.1754296.
  34. Reese, L. and O'Neill, M. (1988), "Drilled shafts: Construction and design", FHWA-SA-HI-88-042, Federal Highway Administration.
  35. Rosenberg, P. and Journeaux, N.L. (1976), "Friction and end bearing tests on bedrock for high capacity socket design", Can. Geotech. J., 13(3), 324-333. https://doi.org/10.1139/t76-033.
  36. Rowe, R.K. and Armitage, H.H. (1987), "A design method for drilled piers in soft rock", Can. Geotech. J., 24(1), 126-142. https://doi.org/10.1139/t87-011.
  37. Tomlinson, M.J. (1977), Pile Design and Construction Practice, Cement and Concrete Association, U.K.
  38. Yang, B., Ma, J., Chen, W. and Yang, Y. (2018), "Uplift behavior of belled short piles in weathered sandstone", Math. Prob. Eng., 8614172. https://doi.org/10.1155/2018/8614172.
  39. Yarramsetty, P.C.R., Domala, V., Poluraju, P. and Sharma, R. (2019), "A study on response analysis of submerged floating tunnel with linear and nonlinear cables", Ocean Syst. Eng., 9(3), 219-240. https://doi.org/10.12989/ose.2019.9.3.219.
  40. Xing, H., Zhang, Z., Meng, M., Luo, Y. and Ye, G. (2014), "Centrifuge tests of superlarge-diameter rock-socketed piles and their bearing characteristics", J. Bridge Eng., 19(6), 213-226. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000582.