Effects of moisture content and tillage methods on creep properties of paddy soil.

The rheological properties parameters of paddy soil affect the interaction between the tillage tools and soil, thus influencing the operation quality and power consumption. In order to study the effects of tillage methods and moisture content on the rheological properties parameters of paddy soil in...

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Autores principales:	Guoyang Liu, Junfang Xia, Kan Zheng, Jian Cheng, Jun Du, Dong Li
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d2864c1ceeb04fc9a35234d05d910a0f
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spelling	oai:doaj.org-article:d2864c1ceeb04fc9a35234d05d910a0f2021-12-02T20:10:07ZEffects of moisture content and tillage methods on creep properties of paddy soil.1932-620310.1371/journal.pone.0253623https://doaj.org/article/d2864c1ceeb04fc9a35234d05d910a0f2021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0253623https://doaj.org/toc/1932-6203The rheological properties parameters of paddy soil affect the interaction between the tillage tools and soil, thus influencing the operation quality and power consumption. In order to study the effects of tillage methods and moisture content on the rheological properties parameters of paddy soil in the middle and lower reaches of the Yangtze River, uniaxial compression creep tests of paddy soils with four moisture contents under no tillage (moisture contents: 26.71%, 24.52%, 23.26%, 21.28%) and plough tillage (moisture contents: 26.77%, 25.55%, 23.40%, 20.56%) were carried out using a TMS-PRO texture analyzer. The creep properties curves obtained from the tests, and the rheological constitutive equation of paddy soil under compression was established by Burgers viscoelastic model. Respectively, the quantitative change rules of creep properties of paddy soil with different moisture contents under different tillage methods and the correlation between these parameters were explored. The results showed that the moisture content under the three-year plough tillage and no tillage methods had significant influence on the rheological properties parameters of paddy soil (P < 0.05). The instantaneous elastic modulus, delay elastic modulus, and viscosity coefficient of the two paddy soils (no tillage and plough tillage soils) decreased with the increase of moisture content. However, the variation rules of relaxation time and delay viscosity coefficient with moisture content differed between these two paddy soils. Specifically, the strain rate of the two paddy soils decreased as moisture content decreased, where the total strain combines elastic strain, viscous strain, and viscoelastic strain. The initial strain rate and steady strain rate of the plough tillage paddy soils were lower than that of the no tillage paddy soils. The established creep model equation could be used to obtain viscoelastic rheological parameters of paddy soil in a wide range. The fitting equations between rheological parameters and moisture content were introduced into Burgers model, and the coupling equations between creep deformation and moisture content and time were derived, which could be used to predict the creep properties and deformation behavior of paddy soil in a certain range of no tillage and ploughed field. Overall, this study has a certain theoretical significance for the development and improvement of paddy soil rheology theory, and can also provide theoretical basis and technical support for the research of agricultural machinery design optimization, field water, soil conservation, soil tillage and compaction related simulation analysis in the middle and lower reaches of the Yangtze River.Guoyang LiuJunfang XiaKan ZhengJian ChengJun DuDong LiPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 6, p e0253623 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Guoyang Liu Junfang Xia Kan Zheng Jian Cheng Jun Du Dong Li Effects of moisture content and tillage methods on creep properties of paddy soil.
description	The rheological properties parameters of paddy soil affect the interaction between the tillage tools and soil, thus influencing the operation quality and power consumption. In order to study the effects of tillage methods and moisture content on the rheological properties parameters of paddy soil in the middle and lower reaches of the Yangtze River, uniaxial compression creep tests of paddy soils with four moisture contents under no tillage (moisture contents: 26.71%, 24.52%, 23.26%, 21.28%) and plough tillage (moisture contents: 26.77%, 25.55%, 23.40%, 20.56%) were carried out using a TMS-PRO texture analyzer. The creep properties curves obtained from the tests, and the rheological constitutive equation of paddy soil under compression was established by Burgers viscoelastic model. Respectively, the quantitative change rules of creep properties of paddy soil with different moisture contents under different tillage methods and the correlation between these parameters were explored. The results showed that the moisture content under the three-year plough tillage and no tillage methods had significant influence on the rheological properties parameters of paddy soil (P < 0.05). The instantaneous elastic modulus, delay elastic modulus, and viscosity coefficient of the two paddy soils (no tillage and plough tillage soils) decreased with the increase of moisture content. However, the variation rules of relaxation time and delay viscosity coefficient with moisture content differed between these two paddy soils. Specifically, the strain rate of the two paddy soils decreased as moisture content decreased, where the total strain combines elastic strain, viscous strain, and viscoelastic strain. The initial strain rate and steady strain rate of the plough tillage paddy soils were lower than that of the no tillage paddy soils. The established creep model equation could be used to obtain viscoelastic rheological parameters of paddy soil in a wide range. The fitting equations between rheological parameters and moisture content were introduced into Burgers model, and the coupling equations between creep deformation and moisture content and time were derived, which could be used to predict the creep properties and deformation behavior of paddy soil in a certain range of no tillage and ploughed field. Overall, this study has a certain theoretical significance for the development and improvement of paddy soil rheology theory, and can also provide theoretical basis and technical support for the research of agricultural machinery design optimization, field water, soil conservation, soil tillage and compaction related simulation analysis in the middle and lower reaches of the Yangtze River.
format	article
author	Guoyang Liu Junfang Xia Kan Zheng Jian Cheng Jun Du Dong Li
author_facet	Guoyang Liu Junfang Xia Kan Zheng Jian Cheng Jun Du Dong Li
author_sort	Guoyang Liu
title	Effects of moisture content and tillage methods on creep properties of paddy soil.
title_short	Effects of moisture content and tillage methods on creep properties of paddy soil.
title_full	Effects of moisture content and tillage methods on creep properties of paddy soil.
title_fullStr	Effects of moisture content and tillage methods on creep properties of paddy soil.
title_full_unstemmed	Effects of moisture content and tillage methods on creep properties of paddy soil.
title_sort	effects of moisture content and tillage methods on creep properties of paddy soil.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/d2864c1ceeb04fc9a35234d05d910a0f
work_keys_str_mv	AT guoyangliu effectsofmoisturecontentandtillagemethodsoncreeppropertiesofpaddysoil AT junfangxia effectsofmoisturecontentandtillagemethodsoncreeppropertiesofpaddysoil AT kanzheng effectsofmoisturecontentandtillagemethodsoncreeppropertiesofpaddysoil AT jiancheng effectsofmoisturecontentandtillagemethodsoncreeppropertiesofpaddysoil AT jundu effectsofmoisturecontentandtillagemethodsoncreeppropertiesofpaddysoil AT dongli effectsofmoisturecontentandtillagemethodsoncreeppropertiesofpaddysoil
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Effects of moisture content and tillage methods on creep properties of paddy soil.

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