Creep Properties of Expansive Soils under Triaxial Drained Conditions and its Nonlinear Constitutive Model

doi:10.3311/PPci.18406

	Creep Properties of Expansive Soils under Triaxial Drained Conditions and its Nonlinear Constitutive Model
	Li, Jingjing 3; Kong, Lingwei 1,2
刊名	PERIODICA POLYTECHNICA-CIVIL ENGINEERING
	2021-09-08
页码	10
关键词	expansive soil triaxial creep test nonlinearity creep model critical failure stress
ISSN号	0553-6626
DOI	10.3311/PPci.18406
英文摘要	The creep behaviors of expansive soils play an important role in landslide prediction and long-term stability analysis. In this paper, triaxial drained compression creep tests of expansive soils were conducted on the improved stress-controlled triaxial apparatus. The test results show that only transient deformation and attenuation creep occur with low deviator stress, and the increment of axial strain increases exponentially with deviator stress increasing; while deviator stress reaches a certain value, attenuation creep, steady creep and accelerated creep all occur in a creep curve. Meanwhile, the volumetric strain presents the shear shrinkage characteristic at the initial stage of loading, and the shear shrinkage is small. With the extension of loading time, the volumetric strain gradually varies from shear contraction to dilatancy. When entering the accelerated creep stage, the development rate of volumetric strain increases sharply. Besides, isochronous stress-strain curves of expansive soils indicate that their creep process possesses nonlinear characteristics, and the nonlinear degree is related to creep time and stress level. Imitating the empirical formula of cyclic cumulative deformation of clay, a new nonlinear creep model is presented, which may well describe the creep property of expansive soils. Furthermore, critical failure stress could be obtained based on the proposed creep model. The ratio of the critical failure stress to conventional shear failure stress ranges from 70% to 80%, with average of 75.56%, therefore, critical failure stress may be estimated by conventional triaxial tests with the margin of error 5.5% within.
资助项目	National Natural Science Foundation of China[12002121] ; National Natural Science Foundation of China[41430634] ; Science and Technology Innovation Team Foundation of Hubei Province Education Department[T201823]
WOS研究方向	Engineering
语种	英语
出版者	BUDAPEST UNIV TECHNOLOGY ECONOMICS
WOS记录号	WOS:000700308700001
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/28556]
专题	中科院武汉岩土力学所
通讯作者	Li, Jingjing
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China 3.Hubei Polytech Univ, Sch Civil Engn, Huangshi 435003, Hubei, Peoples R China
推荐引用方式 GB/T 7714	Li, Jingjing,Kong, Lingwei. Creep Properties of Expansive Soils under Triaxial Drained Conditions and its Nonlinear Constitutive Model[J]. PERIODICA POLYTECHNICA-CIVIL ENGINEERING,2021:10.
APA	Li, Jingjing,&Kong, Lingwei.(2021).Creep Properties of Expansive Soils under Triaxial Drained Conditions and its Nonlinear Constitutive Model.PERIODICA POLYTECHNICA-CIVIL ENGINEERING,10.
MLA	Li, Jingjing,et al."Creep Properties of Expansive Soils under Triaxial Drained Conditions and its Nonlinear Constitutive Model".PERIODICA POLYTECHNICA-CIVIL ENGINEERING (2021):10.