Post-liquefaction shearing behaviour of saturated gravelly soils: Experimental study and discrete element simulation
To investigate the post-liquefaction shearing behaviour of saturated gravelly soil, laboratory tests were conducted using a static–dynamic multi-purpose triaxial apparatus. In addition, numerical simulations using the discrete element method (DEM) were performed to preliminarily understand the micro...
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2020-10-01
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doaj-1741cb46a2a7412e8cdda266e1bf7b142020-11-25T03:51:56ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552020-10-0112511191130Post-liquefaction shearing behaviour of saturated gravelly soils: Experimental study and discrete element simulationYong Wang0Yanli Wang1Lingwei Kong2Zhiliang Sun3State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China; Corresponding author.Yangtze River Scientific Research Institute, Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources, Wuhan, 430010, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, ChinaTo investigate the post-liquefaction shearing behaviour of saturated gravelly soil, laboratory tests were conducted using a static–dynamic multi-purpose triaxial apparatus. In addition, numerical simulations using the discrete element method (DEM) were performed to preliminarily understand the micro-mechanism of gravelly soil in monotonic loading after liquefaction. The influences of dry density, initial confining stress and degree of liquefaction on the post-liquefaction shearing behaviour of gravelly soil were discussed, and the evolution of the micro-parameters of the granular system was also analysed. The results show that the stress–strain responses of gravelly soil after liquefaction can be divided into three stages: (1) low strength stage, (2) super-linear strength recovery stage, and (3) sublinear strength recovery stage, which are distinctly different from those of the general saturated gravelly soil without previous cyclic loading. The initial state and prior dynamic stress history have significant influences on the post-liquefaction shearing behaviour of gravelly soil. The DEM simulation revealed that the average coordination number sharply increases, the contact normal shows an obvious orientation distribution, and the destroyed force chain backbones are reconstructed in the monotonic reloading process after liquefaction. The evolution of the micro-parameters of the granular system clearly reflects the interior interaction process and micro-mechanisms in the particles during the three different stages of the macro-mechanical behaviour of gravelly soil.http://www.sciencedirect.com/science/article/pii/S1674775520300913Post-liquefactionMicro-mechanismGravelly soilDeformationDiscrete element method (DEM) |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yong Wang Yanli Wang Lingwei Kong Zhiliang Sun |
spellingShingle |
Yong Wang Yanli Wang Lingwei Kong Zhiliang Sun Post-liquefaction shearing behaviour of saturated gravelly soils: Experimental study and discrete element simulation Journal of Rock Mechanics and Geotechnical Engineering Post-liquefaction Micro-mechanism Gravelly soil Deformation Discrete element method (DEM) |
author_facet |
Yong Wang Yanli Wang Lingwei Kong Zhiliang Sun |
author_sort |
Yong Wang |
title |
Post-liquefaction shearing behaviour of saturated gravelly soils: Experimental study and discrete element simulation |
title_short |
Post-liquefaction shearing behaviour of saturated gravelly soils: Experimental study and discrete element simulation |
title_full |
Post-liquefaction shearing behaviour of saturated gravelly soils: Experimental study and discrete element simulation |
title_fullStr |
Post-liquefaction shearing behaviour of saturated gravelly soils: Experimental study and discrete element simulation |
title_full_unstemmed |
Post-liquefaction shearing behaviour of saturated gravelly soils: Experimental study and discrete element simulation |
title_sort |
post-liquefaction shearing behaviour of saturated gravelly soils: experimental study and discrete element simulation |
publisher |
Elsevier |
series |
Journal of Rock Mechanics and Geotechnical Engineering |
issn |
1674-7755 |
publishDate |
2020-10-01 |
description |
To investigate the post-liquefaction shearing behaviour of saturated gravelly soil, laboratory tests were conducted using a static–dynamic multi-purpose triaxial apparatus. In addition, numerical simulations using the discrete element method (DEM) were performed to preliminarily understand the micro-mechanism of gravelly soil in monotonic loading after liquefaction. The influences of dry density, initial confining stress and degree of liquefaction on the post-liquefaction shearing behaviour of gravelly soil were discussed, and the evolution of the micro-parameters of the granular system was also analysed. The results show that the stress–strain responses of gravelly soil after liquefaction can be divided into three stages: (1) low strength stage, (2) super-linear strength recovery stage, and (3) sublinear strength recovery stage, which are distinctly different from those of the general saturated gravelly soil without previous cyclic loading. The initial state and prior dynamic stress history have significant influences on the post-liquefaction shearing behaviour of gravelly soil. The DEM simulation revealed that the average coordination number sharply increases, the contact normal shows an obvious orientation distribution, and the destroyed force chain backbones are reconstructed in the monotonic reloading process after liquefaction. The evolution of the micro-parameters of the granular system clearly reflects the interior interaction process and micro-mechanisms in the particles during the three different stages of the macro-mechanical behaviour of gravelly soil. |
topic |
Post-liquefaction Micro-mechanism Gravelly soil Deformation Discrete element method (DEM) |
url |
http://www.sciencedirect.com/science/article/pii/S1674775520300913 |
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