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Abstract Through the force analysis of the group pile foundation，a vertical resistance coefficient of soil on the pile cap was proposed to calculate the uplift resistance and the stiffness coefficients of the pile top with the horizontal resistance were deduced based on the‘m’method. The deflection of the pile cap was calculated according to the force equilibrium equations and the internal forces and deflections of single piles were obtained with the deflection of the pile cap. Thus a method for calculating the single piles? internal forces and deflections of the group pile foundation was obtained. Finally，the single piles? internal forces and deflections of a group pile foundation with four piles were calculated under the uplift and compression conditions and the results were analyzed.
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Received: 27 March 2014
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2015, Vol. 34 
