An elasto-plastic model of unsaturated soil with an explicit degree of saturation-dependent CSL

Li, Jian; Yin, Zhen Yu; Cui, Yu Jun; Liu, Kai; Yin, Jian Hua

doi:10.1016/j.enggeo.2019.105240

Cited by 22 publications

(8 citation statements)

References 72 publications

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“…第一种方法直接将屈服函数作为塑性势函数 [10,17,18] , 即采用相关联的流动法则确定塑性应变增量的方向; 第二种方法是构造一个新的塑性势函数 [19][20][21] , 通过塑性势函数的正交梯度确定塑性应变增量的方向, 即非关联的塑性流动法则, 其核心是构造一个与试验规律一致的塑性势函数. 第三种方法是通过剪胀方程 [22][23][24] 确定塑性应变增量的方向, 其核心是构造一个与试验规律一致的剪胀方程. 第一种方法获得的塑性应变增量方向与应力空间的屈服面是正交的, 无法反映塑性应变增量方向与应力空间屈服面之间的非正交特征.…”

Section: 引言unclassified

Non-orthogonal elastoplastic constitutive model for unsaturated soil

Li¹,

Liang²,

Lu³

et al. 2022

Sci. Sin.-Tech.

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Section: 引言unclassified

Non-orthogonal elastoplastic constitutive model for unsaturated soil

Li¹,

Liang²,

Lu³

et al. 2022

Sci. Sin.-Tech.

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“…The PSD for double porosity manifests significant bimodality, which is related to the presence of both macro and micropores (Casini et al 2012;Lewandowska et al 2004;Musso et al 2014;Ngien et al 2012). According to Li et al (2019), the macropores are mainly deformed during loading while the micropores are less affected; however, during drying and wetting process, the micropores will exhibit significant changes and be accompanied by reversible volumetric deformation.…”

Section: Introductionmentioning

confidence: 99%

“…A review of the literature (Cai et al 2018;Li et al 2013Li et al , 2019Mašín 2013;Mašín et al 2005) suggests that there are two ways to consider the effects of double porosity on the hydraulic and mechanical behaviour of unsaturated soils. The first way is adopting a specific microstructural index to represent the main features of double porosity.…”

Section: Introductionmentioning

confidence: 99%

“…However, the model established by Cai et al (2018) is limited to isotropic loading and so cannot consider shear response. Also whilst the model established by Li et al (2019) can consider shear response it adopts average effective stress as one of the main stress variables and so cannot consider how the three principal stresses will change respectively in a triaxial space, such as during shear at a constant net mean stress. A second way is to establish mutually independent models for the loading behaviour of macropores and micropores.…”

Section: Introductionmentioning

confidence: 99%

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Microstructurally Related Model for Predicting Behavior of Unsaturated Soils with Double Porosity in Triaxial Space

Cai

Cleall

et al. 2022

Int. J. Geomech.

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Microstructure can have an important impact on the hydraulic and mechanical behaviour of unsaturated soil and so it is necessary for it to be considered in constitutive models to enable accurate predictions of soil behaviour. This paper focuses on constitutive modelling of soils exhibiting a dual-porosity structure. Based on the assumption that macro and micropores contained in the double porosity structure have different influences on the mechanical and hydraulic behaviour, the effective degree of saturation was selected as a microstructural index. This microstructural index was implemented within a Bishop's effective stress based approach and the Glasgow Coupled Model and the Modified Camclay Model were adopted as the basic framework for the development of a constitutive model. Typical samples of low-expansive, nonexpansive and collapsible soils with dual porosity were selected to validate the model's performance, with the model found to perform well when compared with experimental data in terms of isotropic compression, triaxial shear and wetting tests.

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“…Recently, many studies have been carried out to analyze the effect of wet/dry cycles on the deformation behavior and constitutive stress-strain of soil [15][16][17][18][19]. Furthermore, a number of researchers, such as Li et al 2019 [20], Li and Yang, 2018 [21], Guo et al 2021 [22], and Li et al 2020 [23], have studied the elastoplastic model of unsaturated soils, incorporating different influencing factors. However, the literature about the constitutive model of saturated soils considering the effect of the F-T cycle is relatively sparse.…”

Section: Introductionmentioning

confidence: 99%

Elastoplastic Model Framework for Saturated Soils Subjected to a Freeze–Thaw Cycle Based on Generalized Plasticity Theory

Cong

Ling

et al. 2021

Materials

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The failures of soil slopes during the construction of high-speed railway caused by the soil after the freeze–thaw (F–T) cycle and the subsequent threat to construction safety are critical issues. An appropriate constitutive model for soils accurately describing the deformation characteristics of soil slopes after the F–T cycle is very important. Few constitutive models of soils incorporate the F–T cycle, and the associated flow rule has always been employed in previous models, which results in an overestimation of the deformation of soil exposed to the F–T cycle. Generalized plasticity theory is widely used to predict the performance of geotechnical materials and is especially well adapted to deal with this type of generalized cyclic loading (such as a freeze–thaw cycle), and it overcomes the shortcomings of the associated flow rule that causes larger shear deformation. To this end, an elastoplastic model framework based on generalized plasticity theory with double yield surfaces for saturated soils subjected to F–T cycles was developed. Two types of plastic deformation mechanisms, i.e., plastic volumetric compression and plastic shear, were considered in this elastoplastic model. It was found that this model can accurately predict the mechanical behavior and deformation characteristics of saturated soils after F–T cycles.

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An elasto-plastic model of unsaturated soil with an explicit degree of saturation-dependent CSL

Cited by 22 publications

References 72 publications

Non-orthogonal elastoplastic constitutive model for unsaturated soil

Non-orthogonal elastoplastic constitutive model for unsaturated soil

Microstructurally Related Model for Predicting Behavior of Unsaturated Soils with Double Porosity in Triaxial Space

Elastoplastic Model Framework for Saturated Soils Subjected to a Freeze–Thaw Cycle Based on Generalized Plasticity Theory

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