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Q.Z. Sang¹, X. Chen² and Y. Yuan^1,3

¹College of Civil Engineering, Tongji University, Shanghai, China
²College of Civil Engineering and Architecture, Jiaxing University, Zhejiang, China
³State-Key Laboratory of Disaster Prevention in Civil Engineering, Shanghai, China

doi:10.4203/ccc.6.3.3

Q.Z. Sang, X. Chen, Y. Yuan, "A Small-Strain Damping Model for Gravelly Soils subjected to Different Excitation Frequencies", in P. Ivanyi, J. Kruis, B.H.V. Topping, (Editors), "Proceedings of the Seventeenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 6, Paper 3.3, 2023, doi:10.4203/ccc.6.3.3

Keywords: skeleton damping, hydraulic damping, Biot theory, particle swarm optimization, gravelly soils.

Abstract

In order to account for hydraulic damping in liquefiable areas, a small-strain damping model in shear for gravelly soil subjected to different loading frequencies was presented. The total damping was decomposed into skeleton damping and hydraulic damping induced by motion of viscous pore fluid relative to skeleton. The former was represented by an empirical expression while the latter term was obtained based on Biot theory. The fitting parameters were then determined by using Particle Swarm Optimization (PSO) algorithm. Results were found to match well with experimental data from torsional shear test for gravelly soils of various particle size distributions and under different isotropic confining pressures. Parametric analysis indicated that the hydraulic damping increases monotonically with rising mean grain size and loading frequency, whereas a critical grain size exists at which the total damping takes its minimum value under a given frequency.

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Front Page Browse CCC CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Conferences ISSN 2753-3239 CCC: 6 PROCEEDINGS OF THE SEVENTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: P. Ivanyi, J. Kruis and B.H.V. Topping Paper 3.3 A Small-Strain Damping Model for Gravelly Soils subjected to Different Excitation Frequencies Q.Z. Sang¹, X. Chen² and Y. Yuan^1,3 ¹College of Civil Engineering, Tongji University, Shanghai, China ²College of Civil Engineering and Architecture, Jiaxing University, Zhejiang, China ³State-Key Laboratory of Disaster Prevention in Civil Engineering, Shanghai, China doi:10.4203/ccc.6.3.3 Full Bibliographic Reference for this paper Q.Z. Sang, X. Chen, Y. Yuan, "A Small-Strain Damping Model for Gravelly Soils subjected to Different Excitation Frequencies", in P. Ivanyi, J. Kruis, B.H.V. Topping, (Editors), "Proceedings of the Seventeenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 6, Paper 3.3, 2023, doi:10.4203/ccc.6.3.3 Keywords: skeleton damping, hydraulic damping, Biot theory, particle swarm optimization, gravelly soils. Abstract In order to account for hydraulic damping in liquefiable areas, a small-strain damping model in shear for gravelly soil subjected to different loading frequencies was presented. The total damping was decomposed into skeleton damping and hydraulic damping induced by motion of viscous pore fluid relative to skeleton. The former was represented by an empirical expression while the latter term was obtained based on Biot theory. The fitting parameters were then determined by using Particle Swarm Optimization (PSO) algorithm. Results were found to match well with experimental data from torsional shear test for gravelly soils of various particle size distributions and under different isotropic confining pressures. Parametric analysis indicated that the hydraulic damping increases monotonically with rising mean grain size and loading frequency, whereas a critical grain size exists at which the total damping takes its minimum value under a given frequency. download the full-text of this paper (PDF, 11 pages, 373 Kb) go to the previous paper go to the next paper return to the table of contents return to the volume description
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