Effect of water content and structural anisotropy on mechanical property of claystone

Zhang, Fan; Xie, Shouyi; Hu, Dawei; Shao, Jian‐Fu; Gatmiri, Behrouz

doi:10.1016/j.clay.2012.09.024

Cited by 85 publications

(39 citation statements)

References 12 publications

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“…A comprehensive experimental program has been carried out on argillite (including Tournemire argillite and Meuse/HauteMarne argillite) at the Lille Laboratory of Mechanics, and the results have been reported by Niandou et al [23], Chiarelli et al [4] and Zhang et al [10]. A short summary of test data on argillite is given in this section, and these data will be used in Section 4 to validate the numerical predictions.…”

Section: Summary Of Experimental Investigationsmentioning

confidence: 99%

“…2. Evolution of elastic modulus and peak stress as functions of relative humidity; comparisons between two bedding plane orientations (after [10]). …”

Section: General Frameworkmentioning

confidence: 99%

“…Various topics have been covered, including micro-and macro-structural factors in anisotropy and the interactions between inherent and induced anisotropies. According to experimental investigations [10], this anisotropic behavior becomes less and less pronounced as the water content degree increases.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the presence of clay elements such as smectite, the mechanical behavior of argillites is very sensitive to the saturation degree. A number of experimental investigations [1][2][3][4][5][6][7][8][9][10] have been performed on various clayey rocks in partially saturated conditions. Certain constitutive models have been proposed using the concept of effective stresses on the partially saturated field.…”

Section: Introductionmentioning

confidence: 99%

“…This class of rocks usually exhibits a selected preferable orientation of distinct bedding planes, which result in inherent anisotropic behavior on the macro-scale. A large body of research [10,[17][18][19][20][21][22][23][24][25][26][27] has been conducted on inherently anisotropic rocks, including experimental characterization, theoretical studies and numerical modeling. Various topics have been covered, including micro-and macro-structural factors in anisotropy and the interactions between inherent and induced anisotropies.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of inherent anisotropic behavior of partially saturated clayey rocks

Zhou

Zhang

et al. 2013

Computers and Geotechnics

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a b s t r a c tClayey rocks are frequently chosen as a geological barrier material for underground repositories. The inherent anisotropic mechanical behavior and the evolution of mechanical behavior with water content are two crucial material properties for the safety analysis of these structures. The present paper focuses on numerical modeling of the inherent anisotropy and the effect of water content, as well as the interactions of these properties in partially saturated clayey rocks with preferably oriented bedding planes. A discrete thermodynamic approach is adopted for describing the inherent anisotropic mechanical behavior, and the anisotropy of the elastic parameters, plastic evolution and damage evolution are considered. Capillary pressure is introduced to describe the effect of the water content with the help of the effective stress concept, and a procedure for the identification of the model parameters is presented. Finally, the proposed model is applied to a study of triaxial compression tests of argillite with different orientations of the bedding planes and variable water content. In summary, the main features of the studied material are well reproduced by the model.

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Section: Summary Of Experimental Investigationsmentioning

confidence: 99%

“…2. Evolution of elastic modulus and peak stress as functions of relative humidity; comparisons between two bedding plane orientations (after [10]). …”

Section: General Frameworkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Modeling of inherent anisotropic behavior of partially saturated clayey rocks

Zhou

Zhang

et al. 2013

Computers and Geotechnics

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Evolution of anisotropy with saturation and its implications for the elastoplastic responses of clay rocks

Borja

2021

Num Anal Meth Geomechanics

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Many clay rocks have distinct bedding planes. Experimental studies have shown that their mechanical properties evolve with the degree of saturation (DOS), often with higher stiffness and strength after drying. For transversely isotropic rocks, the effects of saturation can differ between the bed-normal (BN) and bedparallel (BP) directions, which gives rise to saturation-dependent stiffness and strength anisotropy. Accurate prediction of the mechanical behavior of clay rocks under partially saturated conditions requires numerical models that can capture the evolving elastic and plastic anisotropy with DOS. In this study, we present an anisotropy framework for coupled solid deformation-fluid flow in unsaturated elastoplastic media. We incorporate saturation-dependent strength anisotropy into an anisotropic modified Cam-Clay (MCC) model and consider the evolving anisotropy in both the elastic and plastic responses. The model was calibrated using experimental data from triaxial tests to demonstrate its capability in capturing strength anisotropy at various levels of saturation. Through numerical simulations, we demonstrate the role of evolving stiffness and strength anisotropy in the mechanical behavior of clay rocks. Plane strain simulations of triaxial compression tests were also conducted to demonstrate the impacts of material anisotropy and DOS on the mechanical and fluid flow responses.

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Water Saturation Induced Strength Degradation of Callovo-Oxfordian Claystone

Liu

Shao

2017

Springer Series in Geomechanics and Geoengineering

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Effect of water content and structural anisotropy on mechanical property of claystone

Cited by 85 publications

References 12 publications

Modeling of inherent anisotropic behavior of partially saturated clayey rocks

Modeling of inherent anisotropic behavior of partially saturated clayey rocks

Evolution of anisotropy with saturation and its implications for the elastoplastic responses of clay rocks

Water Saturation Induced Strength Degradation of Callovo-Oxfordian Claystone

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