Abstract
Piles are frequently used to transfer the heavy compressive loads to strong soil layers located in the depth of bed. In addition, such piles may be subjected to combination of repeated compressive and tensile loads due to earthquake, wind, etc. This paper describes a series of laboratory model tests, at unit gravity, performed on belled pile, embedded in unreinforced and geocell-reinforced beds. The tests were performed to evaluate the beneficial effect of geocell in decreasing the downward and upward displacements and performance improvement of the uplift response of belled pile under repeated compressive and tensile loads. Pile displacements due to fifty load repetitions were recorded. The influence of the height of geocell above the bell of pile, an additional geocell layer at the base of belled pile, and the number of load cycles on pile displacements were investigated. The test results show that the geocell reinforcement reduces the magnitude of the final upward displacement. It also acts as a displacement retardant, and changes the behaviour of belled pile from unstable response condition due to excessive upward pile displacement in unreinforced bed to approximately steady response condition. Therefore, the geocell reinforcement permits higher tensile loads or increased cycling. The efficiency of reinforcement in reducing the maximum upward displacement of the pile (i.e. pull-out resistance) was increased by increasing the height of geocell above the bell of the pile. Furthermore, the comparison showed that a specific improvement in upward and downward displacement and the stability against uplift can be achieved using an additional geocell layer at the base. The geocell reinforcement may reduce the required length of pile shaft, consequently reducing required excavation, backfill, and pile’s material. Simple dimensional analysis showed the need for an increased stiffness of the geosynthetic components in order to match prototype-scale performance similitude.
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Abbreviations
- C u :
-
Coefficient of uniformity
- C c :
-
Coefficient of curvature
- D 50 :
-
Medium grain size
- e max :
-
Maximum void ratio
- e min :
-
Minimum void ratio
- φ :
-
Soil friction angle
- D r :
-
Relative density of soil
- b :
-
Reinforcement width of the geocell layers
- H t :
-
Height of geocell layer above the bell of pile
- H b :
-
Height of geocell layer beneath the bell of pile
- N t :
-
Number of layers of geocell reinforcement above the bell of pile
- N b :
-
Number of layers of geocell reinforcement beneath the bell of pile
- d g :
-
Pocket size of the geocell
- D :
-
Diameter of bell
- L :
-
Embedment depth of pile (mm)
- d :
-
Diameter of shaft pile
- λ :
-
Ratio of diameter of prototype bell of pile to diameter of model bell of pile
- q stat :
-
Prespecified static load
- q c :
-
Compressive (downward) repeated load
- q t :
-
Tensile (upward) repeated load
References
Adams MT, Collin JG (1997) Large model spread footing load tests on geosynthetic reinforced soil foundations. J Geotech Geoenviron Eng ASCE 123(1):66–72
Ahmadi H, Hajialilue-Bonab M (2012) Experimental and analytical investigations on bearing capacity of strip footing in reinforced sand backfills and flexible retaining wall. Acta Geotech 7(4):357–373
American Society for Testing and Materials (2003) Standard practice for classification of soils for engineering purposes. Unified soil classification system. ASTM Int D 2478
American Society for Testing and Materials (2007) Standard test method for density and unit weight of soil in place by the sand-cone method. ASTM Int D 1556
Choudhary AK, Jha JN, Gill KS (2010) Laboratory investigation of bearing capacity behaviour of strip footing on reinforced. Geotext Geomembr 28(4):393–402
Consoli NC, Ruver CA, Girardello V, Festugato L, Thome A (2012) Effect of polypropylene fibers on the uplift behavior of model footings embedded in sand. Geosynthet Int 19(1):79–84
Consoli NC, Ruver CA, Girardello V, Festugato L, Thome A (2012) Effect of polypropylene fibers on the uplift behavior of model footings embedded in sand. Geosynthet Int 19(1):79–84
Das BM (1983) A Procedure for estimation of uplift capacity of rough piles. Soils Found 23(3):122–126
Dash SK, Sireesh S, Sitharam TG (2003) Model studies on circular footing supported on geocell reinforced sand underlain by soft clay. Geotext Geomembr 21(4):197–219
Dash SK, Rajagopal K, Krishnaswamy NR (2007) Behaviour of geocell reinforced sand beds under strip loading. Can Geotech J 44(7):905–916
Deskmukh VB, Dewaikar DM, Choudhury D (2010) Computations of uplift capacity of pile anchors in cohesionless soil. Acta Geotech 5(2):87–94
Dickin EA, Leung CF (1990) Performance of piles with enlarged bases subjected to uplift forces. Can Geotech J 27(5):546–556
El Sawwaf MA, Nazir A (2006) The effect of soil reinforcement on pullout resistance of an existing vertical anchor plate in sand. Comput Geotech 33(3):167–176
El Sawwaf MA, Nazir A (2012) Behavior of eccentrically loaded small-scale ring footings resting on reinforced layered soil. J Geotech Geoenviron Eng 137(3):376–384
El-Emam M, Bathurst RJ (2007) Influence of reinforcement parameters on the seismic response reduced-scale reinforced soil retaining walls. Geotext Geomembr 25(3):33–49
Ghosh A, Bera AK (2010) Effect of geotextile ties on uplift capacity of anchors embedded in sand. Geotech Geol Eng 28(5):567–577
Hanna AM, Ghaly AM (1994) Ultimate pull out resistance of groups of vertical anchors. Can Geotech J 31(5):673–682
Honda T, Hirai Y, Sato E (2011) Uplift capacity of belled and multi-belled piles in dense sand. Soils Found 51(3):483–496
Horpibulsuk S, Niramitkorburee A (2010) Pullout resistance of bearing reinforcement embedded in sand. Soils Found 50(2):215–228
Ilamparuthi K, Dickin EA (2001) The influence of soil reinforcement on the uplift behaviour of belled piles embedded in sand. Geotext Geomembr 19(1):1–22
Ilamparuthi K, Dickin EA (2001) Predictions of the uplift response of model belled piles in geogrid-cell-reinforced sand. Geotext Geomembr 19(2):89–109
Ilamparuthi K, Dickin EA, Muthukrisnaiah K (2002) Experimental investigation of the uplift behaviour of circular plat anchors embedded in sand. Can Geotech J 39(3):648–664
Khatri VN, Kumar J (2009) Vertical uplift resistance of circular plate anchors in clays under undrained condition. Comput Geotech 36(8):1352–1359
Kouzer MK, Jyant K (2009) Vertical uplift capacity of two interfering horizontal anchors in sand using an upper bound limit analysis. Comput Geotech 36(6):1084–1089
Leshchinsky B, Ling HI (2013) Numerical modeling of behavior of railway ballasted structure with geocell confinement. Geotext Geomembr 36(1):33–43
Ling HI, Liu H (2009) Deformation analysis of reinforced soil retaining walls—simplistic versus sophisticated finite element analyses. Acta Geotech 4(3):203–213
Love JP (1984) Model testing of geogrids in unpaved roads. PhD thesis. University of Oxford, Oxford, UK
Lovisa J, Kumar Shukla S, Sivakugan N (2010) Behaviour of prestressed geotextile-reinforced sand bed supporting a loaded circular footing. Geotext Geomembr 28(1):23–32
Madhavi Latha G, Somwanshi A (2009) Bearing capacity of square footings on geosynthetic reinforced sand. Geotext Geomembr 27(4):281–294
Merifield RS, Sloan SW (2006) The ultimate pullout capacity of anchors in frictional soils. Can Geotech J 43(8):852–868
Milligan GWE, Fannin RJ, Farrar DM (1986) Model and full-scale tests of granular layers reinforced with a geogrid. In: Proceedings of third international conference on geotextiles, Vienna, vol 1, pp. 61–66
Moghaddas Tafreshi SN, Dawson AR (2010) Comparison of bearing capacity of a strip footing on sand with geocell and with planar forms of geotextile reinforcement. Geotext Geomembr 28(1):72–84
Moghaddas Tafreshi SN, Dawson AR (2010) Behaviour of footings on reinforced sand subjected to repeated loading—comparing use of 3D and planar geotextile. Geotext Geomembr 28(5):434–447
Moghaddas Tafreshi SN, Dawson AR (2012) A comparison of static and cyclic loading responses of foundations on geocell-reinforced sand. Geotext Geomembr 32:55–68
Moghaddas Tafreshi SN, Khalaj O, Halvaee M (2011) Experimental study of a shallow strip footing on geogrid-reinforced sand bed above a void. Geosynthet Int Thomas Telford 18(4):178–195
Sakai T, Tanaka T (2007) Experimental and numerical study of uplift behavior of shallow circular anchor in two-layered sand. J Geotech Geoenviron Eng 133(4):469–477
Sireesh S, Sitharam TG, Dash SK (2009) Bearing capacity of circular footing on geocell–sand mattress overlying clay bed with void. Geotext Geomembr 27(2):89–98
Song Z, Hu Y, Randolph MF (2008) Numerical simulation of vertical pullout of plate anchors in clay. J Geotech Geoenviron Eng ASCE 134(6):866–887
Tagaya K, Scott RF (1988) Pullout resistance of buried anchors in sand. Soil Found 28(3):113–114
Tanyu BF, Aydilek AH, Lau AW, Edil TB, Benson CH (2013) Laboratory evaluation of geocell-reinforced ravel subbase over poor subgrades. Geosynthet Int 20(2):46–71
Treff A (2011) Private communication with Albert Treff of DuPont de Nemours, Luxembourg
Werkmeister S, Dawson AR, Wellner F (2005) Permanent deformation behaviour of granular materials. Int J Road Mater Pavement Des 6:31–51
Yang X, Han J, Leshchinsky D, Parsons RL (2013) A three-dimensional mechanistic-empirical model for geocell-reinforced unpaved roads. Acta Geotech 8(2):201–213
Acknowledgments
The authors would like to thank DuPont de Nemours, Luxembourg, and their UK agents, and TDP Limited, for the geocell and planar reinforcement support with the testing programme. In addition, the authors would like to offer their sincere appreciation to the UK agents, TDP Limited, for their technical advice and insight.
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Moghaddas Tafreshi, S.N., Javadi, S. & Dawson, A.R. Influence of geocell reinforcement on uplift response of belled piles. Acta Geotech. 9, 513–528 (2014). https://doi.org/10.1007/s11440-013-0300-1
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DOI: https://doi.org/10.1007/s11440-013-0300-1