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During the last few decades various researchers have proposed appropriate experimental and numerical methods to estimate the uplift capacity of granular anchor piles (GAPs) in expansive soils. Surprisingly, very few studies have been performed to determine the uplift capacity of GAPs in loose sands. This paper presents the results of the numerical study to estimate the ultimate uplift capacity of group piles. Numerical analysis is performed using finite element software PLAXIS-3D. The foundation system is assumed to consist of a different number of regularly spaced GAPs installed in loose sandy soils. The analysis examines the influence of factors such as number of piles n and length L to width D ratio, and properties of the granular pile material and compares the efficiency of group of GAP systems of different configurations. Keywords Granular anchor pile Á Finite element method Á Loose sand Á Group piles Á Uplift capacity Notations L Length of a pile (m) D Diameter of a pile (m) c Total unit weight of soil above the water table (kN/m 3) c sat Saturated unit weight of soil (kN/m 3) / Angle of internal friction of soil (°) c Cohesion of soil (N/m 2) m Poisson's ratio E s Elastic modulus of surrounding soil (kPa) E p Elastic modulus of pile material (kPa) E Elastic modulus of plate element (kPa) d Thickness of a plate element (m) S Centre to centre spacing between piles in group piles (m) n Number of piles in a pile group g Efficiency & V. A.

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