Effects of the lateral stress on the inner frictional resistance of pipe piles driven into sand
Tóm tắt
The inner frictional resistance of pipe piles depends on the degree of soil plugging. Many factors including pile diameter, lateral stress at the pile tip and geometrical conditions of piles could influence the soil plugging. In this paper, the effects of inner sleeves attached at the pile base on the inner frictional resistance are discussed, particularly highlighting the lateral stresses at the sleeve using small-scale steel pipe piles penetrated into a medium dense sandy ground. A closed-ended pile of the same diameter was also tested to compare it with similar open-ended piles. The results of incremental filling ratio (IFR) and plug length ratio (PLR) were also discussed. A simple method was also proposed to evaluate IFR and PLR for the sleeved piles since they have originally been defined for non-sleeved piles. The results of the IFR indicate that all the piles penetrated under partially-plugged or unplugged state producing smaller penetration resistance than a similar closed-ended pile. The results of the corrected IFR give a better indication of the soil plugging of the sleeved piles, particularly at shallow penetration depths. The results also suggest that the inner frictional resistance increase with the sleeve height. The results of the coefficient of lateral earth pressure, K
h also indicate that K
h increases with the sleeve height. The effects however become less significant at higher sleeve heights. Therefore, we can recommend the use of the inner sleeve as an improvement method to increase the bearing capacity of open-ended piles installed in sandy grounds.
Tài liệu tham khảo
Paikowsky SG, Whitman RV (1990) The effects of plugging on pile performance and design. Can Geotech J 27(4):429–440. doi:10.1139/t90-059
Randolph MF, Steinfelt JS, Wroth CP (1979) The effect of pile type on design parameters for driven piles. Proceedings of 7th European Conference on Soil Mechanics, London, Vol. 2, p 107–114
Szechy CH (1961) The effect of vibration and driving upon the voids in granular soil surrounding a pile. Proceedings of 5th International Conference on Soil Mechanics and Foundation Engineering, Paris, Vol. 2, p 161–164
Nauroy JF, Tirant LP (1983) Model tests of piles in calcareous sands. Proceedings of the Conference on Geotechnical Practice in Offshore Engineering, Texas, p 356–369
Lehane BM, Randolph MF (2002) Evaluation of a minimum base resistance for driven pipe piles in siliceous sand. J Geotech Geoenviron Eng 128(3):198–205. doi:10.1061/(ASCE)1090-0241
Kikuchi Y (2010) Mechanism of inner friction of an open-ended pile. Proceedings of 3rd IPA International Workshop (Press-in Engineering 2011), Shanghai, p 65–83
Tomlinson MJ (2004) Pile Design and Construction Practice. E & FN Spon, London
Paik K, Salgado R (2004) Effect of pile installation method on pipe pile behavior in sands. Geotech Test J 27(1):11–22. doi:10.1520/GTJ11268J
Henke S, Grabe J (2008) Numerical investigation of soil plugging inside open-ended piles with respect to the installation method. Acta Geotech 3(3):215–223. doi:10.1007/s11440-008-0079-7
Henke S, Grabe J (2013) Field measurements regarding the influence of the installation method on soil plugging in tubular piles. Acta Geotech 8(3):335–352. doi:10.1007/s11440-012-0191-6
Paik K, Salgado R (2003) Determination of bearing capacity of open-ended piles in sand. J Geotech Geoenviron Eng 129(1):46–57. doi:10.1061/(ASCE)1090-0241
Paik K, Salgado R, Lee J, Kim B (2003) Behavior of open- and closed-ended piles driven into sands. J Geotech Geoenviron Eng 129(4):296–306. doi:10.1061/(ASCE)1090-0241
Jardine R, Chow F, Overy R, Standing J (2005) ICP design methods for driven piles in sand and clay. Thomas Telford, London
Lehane BM, Schneider JA, Xu X (2005) The UWA-05 method for prediction of axial capacity of driven piles in sand. Proceedings of the International Symposium on Frontiers in Offshore Geotechnics, Perth, p 683–689. doi: 10.1201/NOE0415390637.ch76
Henke S, Bienen B (2013) Centrifuge tests investigating the influence of pile cross-section on pile driving resistance of open-ended piles. Int J Phys Model Geotech 13(2):50–62. doi:10.1680/ijpmg.12.00012
JRA (2002) Specifications for highway bridges. Japan Road Association (JRA), Tokyo (in Japanese)
Jardine RJ, Chow FC (1996) New design methods for offshore piles. MTD publication, London
API (2005) Recommended practice for planning, designing and constructing fixed offshore platforms—working stress design. American Petroleum Institute (API), Washington
Hettler A (1982) Approximation formulae for piles under tension. Proceedings of IUTAM Conference on Deformation and Failure of Granular Materials, Delft, p 603–608
Gudavalli SR, Safaqah O, Seo H (2013) Effect of soil plugging on axial capacity of open-ended pipe piles in sands. Proceedings of 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, p 1487–1490
Jardine RJ, Chow FC (2007) Some recent developments in offshore pile design. Proceedings of 6th International Offshore Site Investigation and Geotechnics Conference, London, p 303–332
Paik KH, Lee DR (1993) Behavior of soil plugs in open ended model piles driven into sands. Mar Georesour Geotechnol 11(4):353–373. doi:10.1080/10641199309379929
Paikowsky SG, Whitman RV, Baligh MM (1989) A new look at the phenomenon of offshore pile plugging. Mar Geotechnol 8(3):213–230. doi:10.1080/10641198909379869
Kikuchi Y, Mizutani T, Yamashita H (2007) Vertical bearing capacity of large diameter steel pipe piles. Proceedings of International Workshop on Recent Advances of Deep Foundations, Taylor and Francis, London, p 711–716. doi: 10.1201/9780203938416.ch10
Yu F, Yang J (2012) Base capacity of open-ended steel pipe piles in sand. J Geotech Geoenviron Eng 138(9):1116–1128. doi:10.1061/(ASCE)GT.1943-5606.0000667
Klos J, Tejchman A (1977) Analysis of behavior of tubular piles in subsoil. Proceedings of 9th International Conference on Soil Mechanics and Foundation Engineering, Tokyo, p 605–608
Randolph MF (1988) The axial capacity of deep foundations in calcareous soil. Proceedings of International Conference on Calcareous Sediments, Rotterdam, Vol. 2, p 837–857
Yamahara H (1964) Plugging effect and bearing mechanism of steel pipe pile (part-1). Trans Archit Inst Jpn 96:28–35 (in Japanese)
Yamahara H (1964) Plugging effects and bearing mechanism of steel pipe piles (part-2). Trans Archit Inst Jpn 97:34–41 (in Japanese)