Abstract
X-section cast-in-place concrete pile (referred to as XCC pile) has a different velocity response compared with circular section pile in the low strain testing due to the special cross section. Full-scale model tests of XCC pile were conducted to reveal the velocity response characteristics. The time-domain velocity responses on the pile top were obtained, which showed obvious three-dimensional effects because of the different high-frequency interferences. The test results were compared with the numerical results to validate the numerical model. Furthermore, numerical simulations were conducted to investigate the propagation characteristic of velocity waves along the longitudinal direction in the pile. The results indicated that the wave propagation was complicated as a result of the superposition of the incident wave and the reflected wave. The effects of the geometrical parameters of cross section on the three-dimensional effects of velocity responses were also studied. Three-dimensional effects would be more significant with a larger arc distance. However, the effects of arc angle were not obvious.
Highlights
IntroductionTraditional one-dimensional wave theory is mainly applicable for small-diameter circular section pile
X-section cast-in-place concrete pile is a new type of abnormal section pile developed in geotechnical research institute of Hohai University and patented in China [1,2,3,4]
In view of its larger bearing capacity and use of less concrete than the common circular section pile, XCC pile has been successfully applied in highway construction as embankment pile and municipal engineering for soft foundation treatment. e quality control during the process of the pile driving is a major problem encountered in XCC pile foundation construction
Summary
Traditional one-dimensional wave theory is mainly applicable for small-diameter circular section pile. During low strain integrity test, the propagation characteristics of stress wave in large diameter pile and abnormal section pile are a three-dimensional problem [7, 8]. Ding et al [16] investigated the mechanism of velocity wave propagation for a concrete filled steel tubular column through the threedimensional finite element method. The studies on the three-dimensional effects of piles in low strain dynamic tests mainly focus on the circular section pile and concrete filled steel tubular column. Due to irregularity of the section of XCC pile, the velocity response on the pile top is different from the circular section pile and concrete filled steel tubular column. E response characteristics of the velocity wave are still unclear. erefore, the research on the three-dimensional effects of XCC pile in low strain dynamic tests is needed. is paper explores the three-dimensional effects of XCC pile in low strain dynamic testing through full-scale model tests and numerical simulations
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