Torsional dynamic response of tapered pile considering compaction effect and stress diffusion effect
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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 © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 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 Cite this article as: GUAN Wen-jie, WU Wen-bing, JIANG Guo-sheng, CHIN Jian Leo, DENG Guo-dong. Torsional dynamic response of tapered pile considering compaction effect and stress diffusion effect [J]. Journal of Central South University, 2020. DOI: https://doi.org/10.1007/s11771-020-4503-y.
1 Introduction In recent years, the tapered piles attracted many attentions from researchers due to their good bearing capacity. Because of the existence of the cone angle of tapered pile, the side surface of tapered pile is subjected to the normal force and the tangential force from the pile surrounding soil,
which makes the friction between pile and its surrounding soil bigger. However, owing to the fact that the dynamic and static interaction mechanism between tapered pile and soil is still unclear and the construction technology is relatively complex, the tapered pile is not widely used in the engineering project. Over the last 50 years, field and model tests [1−6], theoretical method [7−9] and numerical simulations [10−12] have been used by many
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