Assessing the Effects of Length, Slope and Distance between Piles on the Bearing Capacity of a Pile Group under Axial Loading in Granular Soil

A. Firoozfar, A. Rostami, H. Ghaderi, H. Zamani, A. Rostamkhani


Piles are usually made of steel, concrete, reinforced concrete or wood, used to enhance the ground’s bearing capacity in order to enable the construction of deep foundations, also called pile foundations. However, the exact effect of the complex interaction between the piles and the surrounding soil has not adequately been investigated yet. Considering the increased application of the technique recently, further analysis is essential for achieving the highest economic and technical capacity. Using fewer piles or shorter piles and allowing greater distances between pile groups, results to reduced construction. However, other restrictions such as high groundwater level, bedrock depth and the limited size of the foundation are also to be considered. The issue of optimal pile layout is further investigated in the current paper employing Plaxis, a finite element software, for modeling purposes and considering axial loadings in granular soils. Results are shown and further discussed.


pile; group; inclined; bearing capacity; Plaxis; model

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R. Noorzad, G. R. Saghaee, “Seismic Analysis of Inclined Micropiles Using Numerical Method”, International Foundation Congress and Equipment Expo, Orlando, Florida, United States, March 15-19, 2009

I. Juran, A. Benslimane, S. Hanna, “Engineering analysis of dynamic behavior of micropile systems”, Transportation Research Record: Journal of the Transportation Research Board, Vol. 1772, pp. 91-106, 2001

B. B. Jafar, R. Ahmad, “Optimize the Configuration of Piles Group with Genetic Algorithm Under Asymmetric Loading”, 6th National Conferences of Civil Engineering, Semnan, Iran, 25 April 2011

M. J. Tomlinson, J. Woodward, Pile Design and Construction Practice, 6th edition, CRC Press, 2014

J. B. Kim, R. J. Brungraber, “Full-scale lateral load tests of pile groups”, ASCE Journal of the Geotechnical Engineering Divission, Vol. 102, No. GTI, pp. 87-105, 1976

H. Niandou, D. Breysse, “Reliability Analysis of a Piled Raft Accounting for Soil Horizontal Variability”, Computers and Geotechnics, Vol. 34, pp. 71–80, 2007

N. Gerolymos, A. Giannakou, I. Anastasopoulos, G. Gazetas, “Evidence of beneficial role of inclined piles: observations and Summary of numerical Analyses”, Bulletin of Earthquake Engineering, Vol. 6, No. 4, pp. 705-722, 2008

E. M. Comodromos, C. T. Anagnostopoulos, M. K. Georgiadis, “Numerical assessment of axial pile group response based on load test”, Journal of Computers and Geotechnics, Vol. 30, pp. 505-515, 2003

S. Rajashree, T. Sitharam, “Nonlinear Finite-Element Modeling of Batter Piles under Lateral Load”, ASCE J. Geotech. Geoenviron. Eng., Vol. 127, No. 7(604), pp. 604-612, 2001

H. Poulos, E. Davis, Pile foundation analysis and design, John Wiley and Sons, 1980

G. Ranjan, G. Ramasamy, R. P. Tyagi, “Lateral response of batter piles and pile bents in clay,” Indian Geotech. J., No. 10, No. 2, pp. 135-142, 1980

A. Hanna, A. Afram, “Pullout capacity of single batter piles in sand”, Can. Geotech. J., Vol. 23, No. 3, pp. 387–392, 1986

A. Hanna, T. Nguyen, “Shaft resistance of single vertical and batter piles driven in sand.” ASCE Journal of Geotechnical and Geoenvironmental Engineering, No. 129, pp. 601-607, 2003

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