A model for describing and predicting the creep strain of rocks from the primary to the tertiary stage

Wang, Ruofan; Li, Li; Simon, Richard

doi:10.1016/j.ijrmms.2019.104087

Cited by 25 publications

(10 citation statements)

References 60 publications

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“…The phenomenon of time-dependent deformation of the No. 1 drainage tunnel surrounding rock and slope is a typical creep-type deformation [ 9 – 11 ]. Many scholars have conducted numerous creep tests, such as single-stage, multilevel creep tests and loading cycle creep tests, on different rocks to investigate their creep behaviour [ 9 , 11 – 15 ].…”

Section: Introductionmentioning

confidence: 99%

“…1 drainage tunnel surrounding rock and slope is a typical creep-type deformation [ 9 – 11 ]. Many scholars have conducted numerous creep tests, such as single-stage, multilevel creep tests and loading cycle creep tests, on different rocks to investigate their creep behaviour [ 9 , 11 – 15 ]. To characterize the creep evolution of rocks, empirical models, component models, and other novel models have been proposed.…”

Section: Introductionmentioning

confidence: 99%

“…A component model is relatively easy to understand, and the components and parameters have physical meaning. However, a component model is phenomenologically proposed based on the mechanical response of rock and not based on the mechanism of creep [ 11 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

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Unified transient creep constitutive model based on the crack evolution of micritic bioclastic limestone

Li²,

Yao³

et al. 2022

PLoS ONE

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The surrounding rock at the exit of the No. 1 drainage tunnel of the Artashi Water Conservancy Project is micritic bioclastic limestone with 55% bioclastic material. This rock underwent unpredictable large and time-dependent deformation during excavation. To date, the mechanical behaviour of this kind of rock has rarely been studied. In this study, traditional triaxial compression tests and multilevel creep tests were conducted on micritic bioclastic limestone, and the results clarified the instantaneous and time-dependent mechanical properties of the rock. Considering that the essence of rock failure is crack growth, the crack strain evolution properties were revealed in rock triaxial compression tests and multilevel creep tests. Based on triaxial compression tests, the evolution of axial cracks with increasing deviatoric stress ratio Rd (ratio of deviatoric stress to peak deviatoric stress) was observed, and an axial crack closure element and new crack growth element were proposed. To simulate the creep behaviour of a rock specimen, the relationship of the rock creep crack strain rate with Rd was studied. A creep crack element was created, and the creep crack strain evolution equation was obtained, which closely fit the experimental data. Combining the 4 element types (elastic element, crack closure element, crack growth element, and creep crack element), a unified transient creep constitutive model (Mo’s model) was proposed, which represented both the transient and time-dependent mechanical properties of the micritic bioclastic limestone.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Unified transient creep constitutive model based on the crack evolution of micritic bioclastic limestone

Li²,

Yao³

et al. 2022

PLoS ONE

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“…The creep behavior is obvious in soft rocks [5] , but hard rocks under high stress can also exhibit obvious creep behavior. Excessive deformation caused by creep can affect the design function of rock infrastructure and increase the repair cost [6] . Therefore, creep characteristics is a significant mechanical basis to long-term stability of rock engineering [7] , and the effect of creep on the stability of geotechnical engineering should be fully considered.…”

Section: Introductionmentioning

confidence: 99%

“…A number of studies have been reported on creep characteristics of rock by analyzing creep strain or deformation. Wang R. et al [6] and Goodman R. [8] indicated that the creep strain of a rock mass under different applied stresses can be divided into three stages: primary creep (attenuated creep), secondary creep (steady creep), tertiary creep (accelerated creep), as shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Creep strain analysis and an improved creep model of granite based on the ratio of deviatoric stress-peak strength under different confining pressures

Zhang

Wang

et al. 2022

Environ Earth Sci

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Creep refers to the deformation of rock with time under long-term applied stress, which occur in most underground engineering. The creep behavior of granite in Shuang jiangkou underground powerhouse in Western Sichuan Province, China, was studied by creep tests. Based on test results, a new parameter DPR, the ratio of deviatoric stress to peak strength, is proposed. DPR is found to be a key parameter to describe creep parameters such as instantaneous elastic modulus, creep elastic modulus, and viscosity coefficient of rock under different confining pressures. Creep tests show that instantaneous elastic modulus increases with the increase of DPR. Creep elastic modulus increases when DPR changes from 0.54 to 0.7004, but decreases when DPR is from 0.7004 to 0.88, indicating fractures in rock closes firstly and then new fractures are generated. The viscosity coefficient of the rock increases first and then decreases with the increase of DPR, and when DPR = 0.7171, viscosity coefficient is maximum, indicating the time for rock to reach stability is the longest in creep tests. By introducing DPR and confining pressure into creep model, which interconnect creep parameters in a unified expression, an improved generalized Kelvin creep model is proposed which can accurately describe the primary and the secondary creep behavior of granite under given deviatoric stresses and confining pressures.

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Evaluating the Microstructure Evolution Behaviors of Saturated Sandstone Using NMR Testing Under Uniaxial Short-Term and Creep Compression

et al. 2021

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A model for describing and predicting the creep strain of rocks from the primary to the tertiary stage

Abstract: Ce fichier a été téléchargé à partir de PolyPublie, le dépôt institutionnel de Polytechnique MontréalThis file has been downloaded from PolyPublie, the institutional repository of Polytechnique Montréal http://publications.polymtl.ca

Cited by 25 publications

References 60 publications

Unified transient creep constitutive model based on the crack evolution of micritic bioclastic limestone

Unified transient creep constitutive model based on the crack evolution of micritic bioclastic limestone

Creep strain analysis and an improved creep model of granite based on the ratio of deviatoric stress-peak strength under different confining pressures

Evaluating the Microstructure Evolution Behaviors of Saturated Sandstone Using NMR Testing Under Uniaxial Short-Term and Creep Compression

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