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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 12    December 2020

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Torsional dynamic response of tapered pile considering compaction effect and stress diffusion effect
GUAN Wen-jie(官文杰)1, 2, 3, WU Wen-bing(吴文兵)1, 2, JIANG Guo-sheng(蒋国盛)1, CHIN Jian Leo3, DENG Guo-dong(邓国栋)4

1. MOE Engineering Research Center of Rock-Soil Drilling & Excavation and Protection, Faculty of Engineering, China University of Geosciences, Wuhan 430074, China;
2. MOE Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;
3. School of Engineering, University of Western Sydney, Locked Bag 1797, Penrith, Sydney,
NSW 2751, Australia;
4. School of Civil Engineering, Central South University, Changsha 410075, China

Abstract:Considering both the compaction effect of pile surrounding soil and the stress diffusion effect of pile end soil, this paper theoretically investigates the torsional vibration characteristics of tapered pile. Utilizing the complex stiffness transfer model to simulate compaction effect and tapered fictitious soil pile model to simulate stress diffusion, the analytical solution for the torsional impedance at tapered pile top is obtained by virtue of Laplace transform technique and impedance transfer method. Based on the present solution, a parametric study is conducted to investigate the rationality of the present solution and the influence of soil and pile properties on the torsional vibration characteristics of tapered pile embedded in layered soil. The results show that, both the compaction effect and stress diffusion effect have significant influence on the torsional vibration characteristics of tapered pile, and these two factors should be considered during the dynamic design of pile foundation.

 

Key words: tapered pile; compaction effect; stress diffusion effect; complex stiffness transfer model; tapered fictitious soil pile model

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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