Vertical dynamic impedance of pile considering the dynamic stress diffusion effect of pile end soil |
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| Authors: | Tian-Le Liu Wen-Bing Wu Bin Dou Guo-Sheng Jiang Shu-Hui Lü |
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| Institution: | 1. Engineering Research Center of Rock-Soil Drilling &2. Excavation and Protection, Ministry of Education, Wuhan, Hubei, China;3. Engineering Faculty, China University of Geosciences, Wuhan, Hubei, Chinabriandou@163.com;5. Engineering Faculty, China University of Geosciences, Wuhan, Hubei, China;6. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou, Zhejiang, China |
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| Abstract: | A new analytical model is presented to analyze the dynamic stress diffusion effect of pile end soil on the vertical dynamic impedance of the pile. The surrounding soil of the pile is modeled by using the plane strain model and the pile is simulated by using one-dimensional elastic theory. Finite soil layers below the pile end are modeled as conical fictitious soil pile with stress diffusion angle which reflects the dynamic stress diffusion effect of pile end soil. By means of the Laplace transform and impedance function transfer method, the analytical solution of the vertical dynamic impedance at the pile head in frequency domain is yielded. Then, a comparison with other models is performed to verify the conical fictitious soil pile model. Finally, based on the proposed solution, the selected numerical results are compared to analyze the influence of dynamic stress diffusion effect for different design parameters of the soil-pile system on the vertical dynamic impedance at the pile head. |
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| Keywords: | Conical fictitious soil pile model dynamic damping dynamic stiffness dynamic stress diffusion effect vertical dynamic impedance |
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