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A New Approach for Classifying the Permanent Deformation Properties of Granular Materials under Cyclic Loading

A series of medium-sized cyclic triaxial tests were performed to investigate the permanent deformation properties of granular materials. The strain rate was then plotted against loading cycles to classify the permanent deformation properties of granular materials under different cyclic stress ratios...

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Autores principales: Liu, Gang, Zhao, Mingzhi, Luo, Qiang, Zhou, Jianchuan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10052981/
https://www.ncbi.nlm.nih.gov/pubmed/36984021
http://dx.doi.org/10.3390/ma16062141
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author Liu, Gang
Zhao, Mingzhi
Luo, Qiang
Zhou, Jianchuan
author_facet Liu, Gang
Zhao, Mingzhi
Luo, Qiang
Zhou, Jianchuan
author_sort Liu, Gang
collection PubMed
description A series of medium-sized cyclic triaxial tests were performed to investigate the permanent deformation properties of granular materials. The strain rate was then plotted against loading cycles to classify the permanent deformation properties of granular materials under different cyclic stress ratios (CSRs). It was found that (1) the permanent strain rate dε(p)/dN was linearly correlated with loading cycles N using a double-log coordinate on the condition of CSR < 60%; (2) the deformation tendency factor β, which was extracted from the linear relationship between dε(p)/dN and N, significantly varied with CSR and, thus, can be adopted to identify the deformation states; (3) β > 1 implying that permanent strain accumulation ceases in limited cycles and corresponds to the plastic shakedown range, while 0 < β ≤ 1 indicates the temporary steady state, corresponding to the plastic creep range; (4) sluggish decrease or remarkable increase in dε(p)/dN appeared as CSR ≥ 60%, leading to soil collapsed in limited loading cycles and resulting in an incremental collapse range. The new approach was validated by the crushed tuff aggregates and subgrade materials reported previously. It is expected that the new approach will have wider applicability than the traditional one and can provide technical guidance for the design and construction of substructures in roadway and railway engineering.
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spelling pubmed-100529812023-03-30 A New Approach for Classifying the Permanent Deformation Properties of Granular Materials under Cyclic Loading Liu, Gang Zhao, Mingzhi Luo, Qiang Zhou, Jianchuan Materials (Basel) Article A series of medium-sized cyclic triaxial tests were performed to investigate the permanent deformation properties of granular materials. The strain rate was then plotted against loading cycles to classify the permanent deformation properties of granular materials under different cyclic stress ratios (CSRs). It was found that (1) the permanent strain rate dε(p)/dN was linearly correlated with loading cycles N using a double-log coordinate on the condition of CSR < 60%; (2) the deformation tendency factor β, which was extracted from the linear relationship between dε(p)/dN and N, significantly varied with CSR and, thus, can be adopted to identify the deformation states; (3) β > 1 implying that permanent strain accumulation ceases in limited cycles and corresponds to the plastic shakedown range, while 0 < β ≤ 1 indicates the temporary steady state, corresponding to the plastic creep range; (4) sluggish decrease or remarkable increase in dε(p)/dN appeared as CSR ≥ 60%, leading to soil collapsed in limited loading cycles and resulting in an incremental collapse range. The new approach was validated by the crushed tuff aggregates and subgrade materials reported previously. It is expected that the new approach will have wider applicability than the traditional one and can provide technical guidance for the design and construction of substructures in roadway and railway engineering. MDPI 2023-03-07 /pmc/articles/PMC10052981/ /pubmed/36984021 http://dx.doi.org/10.3390/ma16062141 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Liu, Gang
Zhao, Mingzhi
Luo, Qiang
Zhou, Jianchuan
A New Approach for Classifying the Permanent Deformation Properties of Granular Materials under Cyclic Loading
title A New Approach for Classifying the Permanent Deformation Properties of Granular Materials under Cyclic Loading
title_full A New Approach for Classifying the Permanent Deformation Properties of Granular Materials under Cyclic Loading
title_fullStr A New Approach for Classifying the Permanent Deformation Properties of Granular Materials under Cyclic Loading
title_full_unstemmed A New Approach for Classifying the Permanent Deformation Properties of Granular Materials under Cyclic Loading
title_short A New Approach for Classifying the Permanent Deformation Properties of Granular Materials under Cyclic Loading
title_sort new approach for classifying the permanent deformation properties of granular materials under cyclic loading
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10052981/
https://www.ncbi.nlm.nih.gov/pubmed/36984021
http://dx.doi.org/10.3390/ma16062141
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