Shear creep mechanical properties and damage model of mudstone in open-pit coal mine

Li, Guanghe; Wang, Yanting; Hu, Y.; Wang, Dong; Li, Yanfei; Zhou, Zhiwei; Zhang, Shipeng

doi:10.1038/s41598-022-08488-3

Cited by 7 publications

(6 citation statements)

References 18 publications

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“…In a three-dimensional stress state, assume that the total strain of the nonlinear viscoelastic–plastic creep damage model is ε ij , the strain of the elastomer is , the strain of the viscous element is , the strain of the nonlinear Kelvin element is , and the strain of the viscoelastic–plastic element considering damage is . As all four elements are in series, the total strain is given as [ 42 ]: …”

Section: Establishment Of Nonlinear Viscoelastic–plastic Creep Damage...mentioning

confidence: 99%

Three-dimensional nonlinear model of rock creep under freeze–thaw cycles

Wang

et al. 2023

PLoS ONE

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In areas with large differences between day and night temperature, the freeze–thaw cycle and frost heaving force in rock mass generate cracks within the rock, which seriously threatens the stability and safety of geotechnical engineering structures and surrounding buildings. This problem can be solved by developing a reasonable model that accurately represents the rock creep behavior. In this study, we developed a nonlinear viscoelastic–plastic creep damage model by introducing material parameters and a damage factor while connecting an elastomer, a viscosity elastomer, a Kelvin element, and a viscoelastic–plastic element in series. One- and three-dimensional creep equations were derived, and triaxial creep data were used to determine the model parameters and to validate the model. The results showed that the nonlinear viscoelastic–plastic creep damage model can accurately describe rock deformation in three creep stages under freeze–thaw cycles. In addition, the model can describe the time-dependent strain in the third stage. Parameters G1, G2, and η20’ decrease exponentially with the increase in the number of freeze–thaw cycles while parameter λ increases exponentially. These results provide a theoretical basis for studying the deformation behavior and long-term stability of geotechnical engineering structures in areas with large diurnal temperature differences.

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Section: Establishment Of Nonlinear Viscoelastic–plastic Creep Damage...mentioning

confidence: 99%

Three-dimensional nonlinear model of rock creep under freeze–thaw cycles

Wang

et al. 2023

PLoS ONE

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“…Thus, studying the rheological deformation of soil is necessary in the engineering design. Building a proper rheological model under general stress state is the essential to predicting rheological deformation of soil 10,11,12 .…”

Section: Introductionmentioning

confidence: 99%

“…Based on Eqs. ( 9)- (11) and Eq. ( 19), The final rheological model under normal stress state is described by Eq.…”

mentioning

confidence: 99%

Developing three-dimensional rheological model for clay from K0 oedometer test

Ge,

Jungao,

Tao

et al. 2024

Preprint

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The rheological deformation of soil can pose significant threats to the economy and public safety, making accurate prediction of soil rheological deformation crucial. In this paper, one-dimensional compression rheological tests were operated for over-consolidated clay by a novel K0 oedometer. The test results show that the coefficient of earth stress at rest K0 remains constant over time under constant load. The strain-time relationship during reloading can be described by a hyperbolic function, while the stress-strain relationship can be represented by a power function. Based on the relationship of strain-stress-time and the equal timeline theory, a one-dimensional viscoplastic equation was proposed to describe the axial strain rate. By introducing K0, a viscoplastic volumetric strain rate equation is derived, leading to the development of a three-dimensional elastic viscoplastic model under general stress conditions. Verification shows that the predictions of the proposed model agrees well with the test data of triaxial rheological. The model, based on K0 oedometer tests data, offers a simplified alternative to complex triaxial rheological tests and extends the modeling approach of rheological models.

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“…10 Meanwhile, understanding the shear creep characteristics of fault rock and clay coatings is critical to the safe construction and long-term stability analysis of open-pit coal slopes and dam foundations. 11,12 We note that most classical studies on clay creep have been focused on modeling creep at the continuum scale. [13][14][15][16][17][18][19] Few studies have been done on understanding the mechanism of clay creep at the nanoscale.…”

Section: Introductionmentioning

confidence: 99%

“…Instrumental measurements of displacement versus time have been used to study the fault creep 10 . Meanwhile, understanding the shear creep characteristics of fault rock and clay coatings is critical to the safe construction and long‐term stability analysis of open‐pit coal slopes and dam foundations 11,12 . We note that most classical studies on clay creep have been focused on modeling creep at the continuum scale 13‐19 .…”

Section: Introductionmentioning

confidence: 99%

Nanoscale creep mechanism of clay through MD modeling with hexagonal particles

Zhang,

Song

2023

Num Anal Meth Geomechanics

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In this article, we investigate the creep mechanism of clay at the nanoscale. We conduct the molecular dynamics (MD) modeling of clay samples consisting of hexagonal particles under compression and shear. The MD simulations include oedometer creep, shear creep, direct shear tests, and stress relaxation. The numerical results show that the nanoscale creep mechanism of clay is related to particle rotation, translation, and stacking under different loading conditions. The clay sample under creep shows two types of particle arrangements, that is, the shifted face‐to‐face configuration and the face‐to‐edge configuration. The orientation angle of clay particles is computed to track the rotation of individual particles due to creep. The fabric variation of the clay under creep is characterized by the dihedral angle between the basal particle plane and the x‐y plane and the order parameter. It is found that the factors affecting the microstructure variation of the clay aggregate include stress levels, loading rates, and particle sizes. In the nanoscale shear creep test, the creep process comprises three stages, that is, primary, secondary, and tertiary. The microstructure change during creep depends on the initial alignment of clay particles. The clay creep under a more significant stress level results in a more considerable order parameter and a more orientated clay structure.

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Shear creep mechanical properties and damage model of mudstone in open-pit coal mine

Cited by 7 publications

References 18 publications

Three-dimensional nonlinear model of rock creep under freeze–thaw cycles

Three-dimensional nonlinear model of rock creep under freeze–thaw cycles

Developing three-dimensional rheological model for clay from K0 oedometer test

Nanoscale creep mechanism of clay through MD modeling with hexagonal particles

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