Experiment analysis on influence of sand particle size on dynamic response of pile body
1. Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. School of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212100, China
Abstract：To investigate the influence of sand particle size on the dynamic response of pile-soil interaction system under impact load, a pile-soil system impact load test device was developed, and the pile-soil system impact tests were carried out with different sand particle sizes. The results show that when the pile diameter is constant, the peak acceleration on the top of piles is decreased significantly with the increasing of sand particle size, and the acceleration attenuation time is decreased slightly. In the frequency domain, the acceleration response spectrum peak of the same pile is increased with the increasing of sand particle size, while the frequency value corresponding to the spectrum peak changes little with the value of 10-20 Hz. The spectrum width reaches the widest value when the particle size is the smallest. In the case of large particle size range (1.00-2.00 mm), compared with other particle size ranges, the slope of trend line is lager, which means that peak acceleration changes obviously with the increasing of diameter ratio (pile diameter/sand particle size). The pile top acceleration is more sensitive to the change of diameter ratio in large particle size case. With the increasing of sand particle size, the peak strain of the same pile is decreased significantly, and the time required for pile stability is shortened for the same impact load.
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2022, Vol. 43 
