Numerical comparison of bearing capacity of tapered pile groups using 3D FEM

• Journal title : Geomechanics and Engineering
• Volume 9, Issue 5,  2015, pp.547-567
• Publisher : Techno-Press
• DOI : 10.12989/gae.2015.9.5.547
Title & Authors
Numerical comparison of bearing capacity of tapered pile groups using 3D FEM
Abstract
This study investigates the behavior of group of tapered and cylindrical piles. The bearing capacities of groups of tapered and cylindrical piles are computed and compared. Modeling of group of piles in this study is conducted in sand using three-dimensional finite element software. For this purpose, total bearing capacity of each group is firstly calculated using the load-displacement curve under specific load and common techniques. Then, the model of group of piles is reloaded under this calculated capacity to find group settlements, stress states on the lateral surfaces of group block, efficiency of group and etc. In order to calculate the efficiency of each group, single tapered and cylindrical piles are modeled separately. Comparison for both tapered and cylindrical group of piles with same volume is conducted and a relation to predict tapered pile group efficiency is developed. A parametric study is also performed by changing parameters such as tapered angle, angle of internal friction of sand, dilatancy angle of soil and coefficient of lateral earth pressure to find their influences on single pile and pile group behavior.
Keywords
group of pile;tapered pile;bearing capacity;3D modeling;finite element;
Language
English
Cited by
1.
Developing hybrid artificial neural network model for predicting uplift resistance of screw piles, Arabian Journal of Geosciences, 2017, 10, 22
References
1.
Bakholdin, B.V. (1971), "Bearing capacity of pyramidal piles", Proceedings of the 4th Conference on Soil Mechanics and Foundation Engineering, Budapest, Hungary, pp. 507-510.

2.
D'Appolonia, E. and Hribar, J.A. (1963), "Load transfer in step-tapered piles", Soil Mech. Found. Div., ASCE, 89(6), 57-77.

3.
El Naggar, M.H. and Wei, J.Q. (1999a), "Axial capacity of tapered piles established from model tests", Can. Geotech. J., 36(6), 1185-1194.

4.
El Naggar, M.H. and Wei, J.Q. (1999b), "Response of tapered piles subjected to lateral loading", Can. Geotech. J., 36(1), 52-71.

5.
El Naggar, M.H. and Sakr, M. (2000), "Evaluation of axial performance of tapered piles from centrifuge tests", Can. Geotech. J., 37(6), 1295-1308.

6.
El Naggar, M.H. and Wei, J.Q. (2000), "Uplift behavior of tapered piles established from model tests", Can. Geotech. J., 37(1), 56-74.

7.
Fattah, M.Y., Yousif, M.A. and Al-Tameemi, S.M.K. (2015), "Effect of pile group geometry on bearing capacity of piled raft foundations", Struct. Eng. Mech., Int. J., 54(5), 829-853.

8.
Eslami, A. and Fellenius, B.H. (1997), "Pile capacity by direct CPT and CPTu methods applied to 102 case histories", Can. Geotech. J., 34(6), 886-904.

9.
Ghasemi, M. (2006), "Experimental investigation of bearing capacity of pyramidal piles in sand", M.Sc. Thesis; Soil Mechanics & Foundation, Yazd University, Iran.

10.
Ghazavi, M. and Lavasan, A.A. (2006), "Bearing capacity of tapered and step-tapered piles subjected to axial compressive loading", Proceedings of the 7th International Conference on Coasts, Ports & Marine Structures, ICOPMAS, Tehran, Iran.

11.
Hanna, A.M., Morcous, G. and Helmy, M. (2004), "Efficiency of pile groups installed in cohesionless soil using artificial neural networks", Can. Geotech. J., 41(6), 1241-1249.

12.
Khan, M., Kamran, M., El Naggar, H. and Elkasabgy, M. (2008), "Compression testing and analysis of drilled concrete tapered piles in cohesive-frictional soil", Can. Geotech. J., 45(3), 377-392.

13.
Kishida, H. and Meyerhof, G.G. (1965), "Bearing capacity of pile group under eccentric loads in sand", Soil Mech. Fdn. Eng. Conf. Proc., Canada.

14.
Kodikara, J.K. and Moore, I.D. (1993), "Axial response of tapered piles in cohesive frictional ground", Geotech. Eng., 119(4), 675-693.

15.
Nordlund, R.L. (1963), "Bearing capacity of piles in cohesionless soils", Soil Mech. Found. Div., ASCE, 89(3), 1-36.

16.
Paik, K., Lee, J. and Kim, D. (2011), "Axial response and bearing capacity of tapered piles in sandy soil", Geotech. Test. J., 34(2), 122-130.

17.
Ren, Q.X., Hou, C., Lam, D. and Han, L.H. (2014), "Experiments on the bearing capacity of tapered concrete filled double skin steel tubular (CFDST) stub columns", Steel Compos. Struct., Int. J., 17(5), 667-686.

18.
Robinsky, E.L. and Morrison, C.F. (1964), "Sand displacement and compaction around model friction piles", NRC Research; Can. Geotech. J., 1(2), 81-93. DOI: 10.1139/t64-002

19.
Rybnikov, A.M. (1990), "Experimental investigations of bearing capacity of bored-cast-in-place tapered piles", Soil Mech. Found. Eng., 27(2), 48-52.

20.
Surfer 8 user's manual version 4.1 (2009), Copyright Golden Software, USA.

21.
Us army corps of engineers (1997), EL 02 CO97, US Army Publication, USA.

22.
Veiskarami, M., Eslami, A. and Kumar, J. (2011), "End-bearing capacity of driven piles in sand using the stress characteristics method: Analysis and implementation", Can. Geotech. J., 48(10), 1570-1586.

23.
Vesic, A.S. (1967), "Ultimate loads and settlements of deep foundations in sand", Duke University, Durham, NC, USA.

24.
Vesic, A.S. (1969), "Experiments with instrumented pile groups in sand", Duke University, School of Engineering.

25.
Vesic, A. (1975), "Bearing capacity of shallow foundations", Foundation Engineering Handbook 3, pp. 121-145.

26.
Wei, J. and El Naggar, M.H. (1998), "Experimental study of axial behavior of tapered piles", Can. Geotech. J., 35(4), 641-654.

27.
Whitaker, T. (1957), "Experiments with model piles in groups", Geotechnique, 7(4), 147-167.

28.
Zhan, Y.G., Wang, H. and Liu, F.C. (2012), "Numerical study on load capacity behavior of tapered pile foundations", Electron. J. Geotech. Eng., 17, 1969-1980.