Abstract
In order to investigate the bearing characteristics of inclined straight alternating pile groups under vertical and horizontal loads, the indoor model test of 2 × 2 inclined straight alternating pile groups with two layers of soil on low pile caps was carried out, the manufacturing method of inclined straight alternating pile groups was studied, and the test scheme was reasonably designed. In the test, the fast maintenance load method was used to simulate vertical loads, and the horizontal force loading frame was designed to simulate horizontal loads. The experimental data were obtained by pasting strain gauges on the pile body, and the computer was used to process the data according to the mechanical formula. The distribution of axial force, lateral friction resistance, and end resistance of each characteristic pile of the pile group foundation was obtained, and the settlement law of the pile group was analyzed. At the same time, combined with the test data and the existing theories, the interaction mechanism between pile caps, piles, and soil of inclined and straight alternating pile groups is discussed. The load sharing characteristics between piles and pile caps are analyzed, and the horizontal load is in the proportion between straight piles and inclined piles. The stress characteristics of straight piles and pile groups in the pile group system are compared and analyzed, and some valuable conclusions are obtained.
Highlights
In recent years, inclined piles have been widely used in bridge wharf, offshore drilling platform, and large-scale transmission line tower foundation projects [1,2,3,4]
Its good pullout resistance and compression resistance can better meet the requirements of horizontal bearing capacity, but at present there is little research on the mechanism of loading and deformation of inclined piles and inclined pile groups in China, and the axis of inclined piles is not perpendicular to the ground plane, which makes the bearing and deformation behavior of inclined piles more complicated than that of straight piles, so it is of great engineering practical significance to carry out the research of inclined and straight alternating pile groups [5, 6]
In terms of existing theory, Zhao et al tested the load-displacement and pile strain of inclined-inclined, inclined-straight, and straight-straight double piles with caps and straight piles under horizontal load and got the conclusion that the horizontal bearing capacity of load-displacement and pile strain of inclined piles are obviously better than those of straight piles [7, 8]; Zhang et al [9, 10], Binu et al [11], Kong et al [12], Lu et al [13], and Shao et al [14], respectively, studied the vertical bearing capacity of inclined piles through model tests, which is of great significance for understanding the bearing and deformation characteristics of inclined piles
Summary
In recent years, inclined piles have been widely used in bridge wharf, offshore drilling platform, and large-scale transmission line tower foundation projects [1,2,3,4]. Combined with relevant theoretical analysis, the workability of inclined and straight alternating pile groups in different soil layers under vertical and horizontal loads was studied, the distribution of axial force, side friction resistance, and end resistance of each characteristic pile group foundation was obtained, and the settlement law of pile groups was analyzed. On this basis, the characteristics of load sharing between piles and pile caps and the characteristics of horizontal load sharing between straight and inclined piles were analyzed, and some valuable conclusions were obtained
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