A new transversely isotropic nonlinear creep model for layered phyllite and its application

Xu, Guowen; He, Chuan; Yan, Jingjing; Ma, Gaoyu

doi:10.1007/s10064-019-01462-w

Cited by 32 publications

(8 citation statements)

References 32 publications

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“…Wang et al (2022) constructed the nonlinear Maxwell model according to the creep test results of salt rock and applied the creep model to an engineering analysis of salt rock. Xu et al (2019) studied the creep characteristics of melite through tests and applied the creep constitutive equation to numerical calculations. Cheng et al (2021) applied the established fractional nonlinear creep constitutive equation to an engineering stability analysis of salt rock.…”

Section: Introductionmentioning

confidence: 99%

Triaxial creep damage characteristics of sandstone under high crustal stress and its constitutive model for engineering application

Chen

Wang

Versaillot

et al. 2023

Deep Underground Science and Engineering

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The creep characteristics of rock under high crustal stress are of important influence on the long‐term stability of deep rock engineering. To study the creep characteristics and engineering application of sandstone under high crustal stress, this study constructed nonlinear creep damage (NCD) constitutive mode based on the triaxial graded loading‒unloading creep test of sandstone in the Yuezhishan Tunnel. A numerical NCD constitutive model and a breakable lining (BL) model were developed based on FLAC3D and then applied to the stability analysis of the Yuezhishan Tunnel. Based on the creep test results of sandstone, a power function of creep rate and stress level was constructed, by which the long‐term strength was solved. The results show that the long‐term strength of the red sandstone based on the related function of the steady‐state creep rate and stress level is close to the measured stress value in engineering. The NCD model considering damage factors reflects the instantaneous and viscoelastic plasticity deformation characteristics of the red sandstone. The numerical NCD constitutive model and the BL model can reflect surrounding rock deformation characteristics and lining failure characteristics in practical engineering. The research results provide theoretical references for long‐term stability analysis of rock engineering and the deformation control of surrounding rock under high crustal stress.

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Section: Introductionmentioning

confidence: 99%

Triaxial creep damage characteristics of sandstone under high crustal stress and its constitutive model for engineering application

Chen

Wang

Versaillot

et al. 2023

Deep Underground Science and Engineering

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“…Wang and Cai [ 24 ] modified the viscosity coefficients of Maxwell components and proposed a time-to-failure (TtoF) creep model. Xu et al [ 25 ] proposed a novel creep model connecting Maxwell bodies, Kelvin bodies and nonlinear visco-plastic bodies, which described the entire creep process and transverse isotropic characteristics of phyllite. However, the mathematical complexity and redundant parameters of these multi-component systems make practical applications difficult.…”

Section: Introductionmentioning

confidence: 99%

A new shear creep damage model for rock masses after considering initial damage

Wang

et al. 2023

PLoS ONE

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For a long time, one of the important safety problems in open-pit mines is the stability of a large number of high slopes with gently inclined soft interlayer. Rock masses formed after long geological processes generally have some initial damage. Mining works also cause varying degrees of disturbance and damage to rock masses in the mining area during the mining process. This phenomenon means that accurate characterization of the time-dependent creep damage for rock masses under shear load is necessary. The damage variable D is defined based on the spatial and temporal evolution laws of shear modulus and initial level of damage for the rock mass. In addition, a coupling damage equation between the initial damage of the rock mass and shear creep damage is established based on Lemaitre’s strain equivalence assumption. Kachanov’s damage theory is also incorporated to describe the entire process of time-dependent creep damage evolution for rock masses. A creep damage constitutive model that can reasonably reflect the actual mechanical properties of rock masses under multi-stage shear creep loading conditions is established. This takes into account multi-stage shear creep loading conditions, instantaneous creep damage during the shear load phase, staged creep damage and factors influencing the initial damage of rock masses. The reasonableness, reliability and applicability of this model are verified by comparing the results of the multi-stage shear creep test with calculated values from the proposed model. As opposed to the traditional creep damage model, the shear creep model established in this present study takes into account the initial damage of rock masses and can describe the multi-stage shear creep damage characteristics of rock masses more convincingly.

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“…Shales containing bedding surfaces are widely distributed on the Earth and are often encountered during slope excavation, tunnelling, mining, etc. (Xu et al 2019;Zhang et al 2019;Li et al 2020;Yu et al 2020). Under the geological processes of weathering, transportation and sedimentation, many shales are featured by the distinctive bedding structure (Zhang et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Anisotropy and microcrack-induced failure precursor of shales under dynamic splitting

Feng

Gong

Cheng

et al. 2022

Geomatics, Natural Hazards and Risk

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The dynamic anisotropy and failure mechanism of shales are greatly affected by bedding surfaces. To reveal the influence of beddings on anisotropic characteristics of shales under dynamic impact, the Brazilian splitting tests were conducted by the split Hopkinson pressure bar system. The fracturing process were monitored by the high-speed camera. Meanwhile, to understand crack initiation and propagation mechanism, the stress buildup, stress shadow and stress transfer were modelled based on the digital image processing and the rock failure process analysis method. The effect of dip angle and bedding spacing on crack initiation, propagation and coalescence was analyzed. Simultaneously, the spatial distribution and energy magnitude of crack-induced acoustic emissions were captured numerically. The results show that the shale discs continue to produce parallel cracks and cambered cracks induced by the high stresses at the tips of initial cracks; the tensile strength under dynamic splitting changes in the U-shaped trend with the bedding dip angle increasing; the cracking percentage of bedding surfaces decreases, and the cracking percentage of rock matrix increases with the bedding dip angle increasing. In addition, the acceleration of crack growth and the rapid growth of AE energy can be regarded as the effective precursors of shale failure.

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A new transversely isotropic nonlinear creep model for layered phyllite and its application

Cited by 32 publications

References 32 publications

Triaxial creep damage characteristics of sandstone under high crustal stress and its constitutive model for engineering application

Triaxial creep damage characteristics of sandstone under high crustal stress and its constitutive model for engineering application

A new shear creep damage model for rock masses after considering initial damage

Anisotropy and microcrack-induced failure precursor of shales under dynamic splitting

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