Fractional derivative in the elastic-viscoplastic stress-strain state model describing anisotropic creep of soft clays

doi:10.1007/s11043-020-09480-y

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	Fractional derivative in the elastic-viscoplastic stress-strain state model describing anisotropic creep of soft clays
	Wang, Li-ye 1; Zhou, Feng-xi 1,2
刊名	MECHANICS OF TIME-DEPENDENT MATERIALS
	2020
卷号	26 期号:1 页码:133-147
关键词	Fractional derivative Rotational anisotropy Elastic-viscoplastic behavior Deformation model Soft clays
ISSN号	1385-2000
DOI	10.1007/s11043-020-09480-y
英文摘要	A fractional elastic-viscoplastic (F-EVP) creep model describing the anisotropy of soft soil is established. A nonlinear viscoplastic creep expression is obtained by a fractional derivative and the Laplace transformation, which is extended by the definition of the reference yield surface. On this basis, the anisotropy of soil is considered in the model by a rotating hardening criterion, and the effect of anisotropic parameters on the stress-dilatancy ratio is discussed. The scalar multiplier in the form of stress ratio is described, and a critical friction angle is used to unify the modeling parameter. The validity of the model is examined by the existing triaxial creep results. The results indicate that the rotational anisotropy induces coaxial rotation as the result of the stress-dilatation relationship. The fractional viscoplastic model can reasonably describe the plastic behavior of soil before yielding, and accurately characterize the creep behavior of soil. From the comparison between the test results and the model calculation results, it is found that the model calculation results are basically consistent with the test results.
WOS研究方向	Mechanics ; Materials Science
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000597392500001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/155037]
专题	土木工程学院
作者单位	1.Lanzhou Univ Technol, Sch Civil Engn, Lanzhou 730050, Gansu, Peoples R China; 2.HeXi Univ, Sch Civil Engn, Zhangye 734000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Wang, Li-ye,Zhou, Feng-xi. Fractional derivative in the elastic-viscoplastic stress-strain state model describing anisotropic creep of soft clays[J]. MECHANICS OF TIME-DEPENDENT MATERIALS,2020,26(1):133-147.
APA	Wang, Li-ye,&Zhou, Feng-xi.(2020).Fractional derivative in the elastic-viscoplastic stress-strain state model describing anisotropic creep of soft clays.MECHANICS OF TIME-DEPENDENT MATERIALS,26(1),133-147.
MLA	Wang, Li-ye,et al."Fractional derivative in the elastic-viscoplastic stress-strain state model describing anisotropic creep of soft clays".MECHANICS OF TIME-DEPENDENT MATERIALS 26.1(2020):133-147.