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Experimental study on shear strength of saturated remolded loess

Loess has the characteristics of large porosity, loose structure, uniform composition and strong collapsibility. When encountering heavy rainfall and irrigation prone to saturation, resulting in loess landslides, roadbed subsidence and dam instability. In order to study the effect of dry density and...

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Autores principales: Lai, Jie, Liu, Yun, Xiang, Yuzhou, Wang, Wei, Xu, Jiangbo, Cao, Baohua, Zhao, Danni, Wei, Wei, Bao, Han, Yan, Changgen, Lan, Hengxing
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9282495/
https://www.ncbi.nlm.nih.gov/pubmed/35834541
http://dx.doi.org/10.1371/journal.pone.0271266
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author Lai, Jie
Liu, Yun
Xiang, Yuzhou
Wang, Wei
Xu, Jiangbo
Cao, Baohua
Zhao, Danni
Wei, Wei
Bao, Han
Yan, Changgen
Lan, Hengxing
author_facet Lai, Jie
Liu, Yun
Xiang, Yuzhou
Wang, Wei
Xu, Jiangbo
Cao, Baohua
Zhao, Danni
Wei, Wei
Bao, Han
Yan, Changgen
Lan, Hengxing
author_sort Lai, Jie
collection PubMed
description Loess has the characteristics of large porosity, loose structure, uniform composition and strong collapsibility. When encountering heavy rainfall and irrigation prone to saturation, resulting in loess landslides, roadbed subsidence and dam instability. In order to study the effect of dry density and shear rate on the shear strength of saturated remolded loess, the consolidated undrained (CU) test was carried out in Yan’an City by using SLB-6A stress-strain controlled triaxial shear permeability test instrument. The shear rate, confining pressure and dry density were controlled during the test. The dry densities of the samples were 1.5 g / cm3, 1.6 g / cm3 and 1.7 g / cm3, respectively. CU tests of saturated remolded loess were carried out at different shear rates under the confining pressures of 100 kPa, 150 kPa and 200 kPa, respectively. It is found that the stress-strain curve of saturated remolded loess gradually moves upward with the increase of dry density. With the increase of dry density, the cohesion and internal friction angle of remolded saturated loess samples increase. At the same shear rate, with the increase of dry density, the deviatoric stress of the specimen increases significantly.
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spelling pubmed-92824952022-07-15 Experimental study on shear strength of saturated remolded loess Lai, Jie Liu, Yun Xiang, Yuzhou Wang, Wei Xu, Jiangbo Cao, Baohua Zhao, Danni Wei, Wei Bao, Han Yan, Changgen Lan, Hengxing PLoS One Research Article Loess has the characteristics of large porosity, loose structure, uniform composition and strong collapsibility. When encountering heavy rainfall and irrigation prone to saturation, resulting in loess landslides, roadbed subsidence and dam instability. In order to study the effect of dry density and shear rate on the shear strength of saturated remolded loess, the consolidated undrained (CU) test was carried out in Yan’an City by using SLB-6A stress-strain controlled triaxial shear permeability test instrument. The shear rate, confining pressure and dry density were controlled during the test. The dry densities of the samples were 1.5 g / cm3, 1.6 g / cm3 and 1.7 g / cm3, respectively. CU tests of saturated remolded loess were carried out at different shear rates under the confining pressures of 100 kPa, 150 kPa and 200 kPa, respectively. It is found that the stress-strain curve of saturated remolded loess gradually moves upward with the increase of dry density. With the increase of dry density, the cohesion and internal friction angle of remolded saturated loess samples increase. At the same shear rate, with the increase of dry density, the deviatoric stress of the specimen increases significantly. Public Library of Science 2022-07-14 /pmc/articles/PMC9282495/ /pubmed/35834541 http://dx.doi.org/10.1371/journal.pone.0271266 Text en © 2022 Lai et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Lai, Jie
Liu, Yun
Xiang, Yuzhou
Wang, Wei
Xu, Jiangbo
Cao, Baohua
Zhao, Danni
Wei, Wei
Bao, Han
Yan, Changgen
Lan, Hengxing
Experimental study on shear strength of saturated remolded loess
title Experimental study on shear strength of saturated remolded loess
title_full Experimental study on shear strength of saturated remolded loess
title_fullStr Experimental study on shear strength of saturated remolded loess
title_full_unstemmed Experimental study on shear strength of saturated remolded loess
title_short Experimental study on shear strength of saturated remolded loess
title_sort experimental study on shear strength of saturated remolded loess
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9282495/
https://www.ncbi.nlm.nih.gov/pubmed/35834541
http://dx.doi.org/10.1371/journal.pone.0271266
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