Soil-Water Characteristics and Creep Deformation of Unsaturated Expansive Subgrade Soil: Experimental Test and Simulation

The creep deformation of expansive soil has been considered as a vital threat to the safety in engineering construction because it may cause serious slope diseases in geological engineering. Meanwhile, since expansive soil usually remains in unsaturated state, its mechanical property is significantl...

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Autores principales:	Yongsheng Yao, Jue Li, Ziqiong Xiao, Hongbin Xiao
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	subgrade engineering expansive soil soil-water characteristics creep behavior numerical simulation Science Q
Acceso en línea:	https://doaj.org/article/3b7064a91cd2404a93dc494f770e03c0
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spelling	oai:doaj.org-article:3b7064a91cd2404a93dc494f770e03c02021-12-01T13:57:58ZSoil-Water Characteristics and Creep Deformation of Unsaturated Expansive Subgrade Soil: Experimental Test and Simulation2296-646310.3389/feart.2021.783273https://doaj.org/article/3b7064a91cd2404a93dc494f770e03c02021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/feart.2021.783273/fullhttps://doaj.org/toc/2296-6463The creep deformation of expansive soil has been considered as a vital threat to the safety in engineering construction because it may cause serious slope diseases in geological engineering. Meanwhile, since expansive soil usually remains in unsaturated state, its mechanical property is significantly affected by the seasonal environment. Therefore, the nonlinear deformation of expansive soil has received increasing attention, especially the humidity-dependent creep properties. This study focused on the stability of the unsaturated expansive soil subgrade considering rainfall and the creep behavior. Pressure plate extractor and direct shear tests were performed to investigate the hydro-mechanical and creep characteristics of the unsaturated expansive soil. Both the Van-Genuchten and Burgers models were applied to analyze the test results and inserted into the numerical model of the slope under rainfall infiltration. Results show that the compaction degree and the stress state was closely related to the water holding capacity of the expansive soil. The nonlinearity of the creep behavior became increasingly obvious with the increase of time and the stress level. The safety factor of the slope decreased as the rainfall time increased, and the most dangerous slide of the slope moved toward the foot of the slope. Considering the long-term creep process, there was a period of rapid growth in horizontal displacement that is detrimental to the stability of the slope. Besides, the rainfall infiltration could accelerate the slope failure before and after this creep process.Yongsheng YaoJue LiZiqiong XiaoHongbin XiaoFrontiers Media S.A.articlesubgrade engineeringexpansive soilsoil-water characteristicscreep behaviornumerical simulationScienceQENFrontiers in Earth Science, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	subgrade engineering expansive soil soil-water characteristics creep behavior numerical simulation Science Q
spellingShingle	subgrade engineering expansive soil soil-water characteristics creep behavior numerical simulation Science Q Yongsheng Yao Jue Li Ziqiong Xiao Hongbin Xiao Soil-Water Characteristics and Creep Deformation of Unsaturated Expansive Subgrade Soil: Experimental Test and Simulation
description	The creep deformation of expansive soil has been considered as a vital threat to the safety in engineering construction because it may cause serious slope diseases in geological engineering. Meanwhile, since expansive soil usually remains in unsaturated state, its mechanical property is significantly affected by the seasonal environment. Therefore, the nonlinear deformation of expansive soil has received increasing attention, especially the humidity-dependent creep properties. This study focused on the stability of the unsaturated expansive soil subgrade considering rainfall and the creep behavior. Pressure plate extractor and direct shear tests were performed to investigate the hydro-mechanical and creep characteristics of the unsaturated expansive soil. Both the Van-Genuchten and Burgers models were applied to analyze the test results and inserted into the numerical model of the slope under rainfall infiltration. Results show that the compaction degree and the stress state was closely related to the water holding capacity of the expansive soil. The nonlinearity of the creep behavior became increasingly obvious with the increase of time and the stress level. The safety factor of the slope decreased as the rainfall time increased, and the most dangerous slide of the slope moved toward the foot of the slope. Considering the long-term creep process, there was a period of rapid growth in horizontal displacement that is detrimental to the stability of the slope. Besides, the rainfall infiltration could accelerate the slope failure before and after this creep process.
format	article
author	Yongsheng Yao Jue Li Ziqiong Xiao Hongbin Xiao
author_facet	Yongsheng Yao Jue Li Ziqiong Xiao Hongbin Xiao
author_sort	Yongsheng Yao
title	Soil-Water Characteristics and Creep Deformation of Unsaturated Expansive Subgrade Soil: Experimental Test and Simulation
title_short	Soil-Water Characteristics and Creep Deformation of Unsaturated Expansive Subgrade Soil: Experimental Test and Simulation
title_full	Soil-Water Characteristics and Creep Deformation of Unsaturated Expansive Subgrade Soil: Experimental Test and Simulation
title_fullStr	Soil-Water Characteristics and Creep Deformation of Unsaturated Expansive Subgrade Soil: Experimental Test and Simulation
title_full_unstemmed	Soil-Water Characteristics and Creep Deformation of Unsaturated Expansive Subgrade Soil: Experimental Test and Simulation
title_sort	soil-water characteristics and creep deformation of unsaturated expansive subgrade soil: experimental test and simulation
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/3b7064a91cd2404a93dc494f770e03c0
work_keys_str_mv	AT yongshengyao soilwatercharacteristicsandcreepdeformationofunsaturatedexpansivesubgradesoilexperimentaltestandsimulation AT jueli soilwatercharacteristicsandcreepdeformationofunsaturatedexpansivesubgradesoilexperimentaltestandsimulation AT ziqiongxiao soilwatercharacteristicsandcreepdeformationofunsaturatedexpansivesubgradesoilexperimentaltestandsimulation AT hongbinxiao soilwatercharacteristicsandcreepdeformationofunsaturatedexpansivesubgradesoilexperimentaltestandsimulation
_version_	1718405050960707584

Soil-Water Characteristics and Creep Deformation of Unsaturated Expansive Subgrade Soil: Experimental Test and Simulation

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