An analytical p-y curve method based on compressive soil pressure model in sand soil

Abstract

With the high-quality development of urban buildings, higher requirements are come up with for lateral bearing capacity of laterally loaded piles. Consequently, a more accurate analysis to predict the lateral response of the pile within an allowable displacement is an important issue. However, the current p-y curve methods cannot fully take into account the pile-soil interaction, which will lead to a large calculation difference. In this paper, a new analytical p-y curve is established and a finite difference method for determining the lateral response of pile is proposed, which can consider the separation effect of pile-soil interface and the coefficient of circumferential friction resistance. In particular, an analytical expression is developed to determine the compressive soil pressure by dividing the compressive soil pressure into two parts: initial compressive soil pressure and increment of compressive soil pressure. In addition, the relationship between compressive soil pressure and horizontal displacement of the pile is established based on the reasonable assumption. The correctness of the proposed method is verified through four examples. Based on the verified method, a parametric analysis is also conducted to investigate the influences of factors on lateral response of the pile, including internal friction angle, pile length and elastic modulus of pile.

Keywords

laterally loaded piles / compressive soil pressure model / separation effect of pile-soil interface / coefficient of circumferential friction resistance / analytical p-y curve / finite difference method

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