Fluctuation in residual strain and dissipated energy of saturated sandstone under tiered cyclic loading

Jiang, Changbao; Cheng, Guojian; Duan, Manli; Chen, Yufei; Yang, Yang; Kang, Qinrong

doi:10.1371/journal.pone.0236335

Cited by 6 publications

(2 citation statements)

References 39 publications

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“…The residual strain produced during cyclic loading and unloading can only reflect the plastic deformation characteristics at the loading point and unloading point. In contrast, since an obvious hysteretic effect was produced in the stress–strain curve during cyclic loading and unloading, the area encircled by the loading and unloading curves can reflect the energy dissipation characteristics in each cyclic loading and unloading cycle [ 30 ] and, thus, describe the damage characteristics of coal during cyclic loading and unloading from the perspective of energy dissipation.…”

Section: Discussionmentioning

confidence: 99%

Experimental Study on Mechanical and Damage Evolution Characteristics of Coal during True Triaxial Cyclic Loading and Unloading

et al. 2023

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Research on the mechanical properties and damage evolution of coal during true triaxial cyclic loading and unloading is of great significance for maintaining the long-term safety and stability of underground engineering structures in coal mines. In this paper, firstly, the deformation, strength and fracturing characteristics of coal during true triaxial loading and true triaxial cyclic loading and unloading were analyzed. Then, the residual strain characteristics, energy distribution and evolution of coal were systematically studied. Additionally, the damage evolution laws of coal during cyclic loading and unloading were quantitatively analyzed from the perspectives of residual strain and energy dissipation, respectively. The damage evolution law based on residual strain showed that when the intermediate principal stress was high, the damage to coal was directional. With the increase in cyclic load, the coal damage variables in the directions of σ1 and σ3 increased exponentially, while that in the direction of σ2 increased quadratically. The damage evolution law based on energy dissipation showed that the coal damage variable increased exponentially with the increase in cyclic load. With the increase in σ2, the increasing speed of coal damage variable decreased first and then increased. The damage variables established based on residual strain and energy dissipation can both reveal the damage deterioration mechanism of coal during true triaxial cyclic loading and unloading, which is of great theoretical and engineering significance for scientifically evaluating the stability of underground coal and rock engineering and preventing the occurrence of major geological disasters.

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Section: Discussionmentioning

confidence: 99%

Experimental Study on Mechanical and Damage Evolution Characteristics of Coal during True Triaxial Cyclic Loading and Unloading

et al. 2023

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“…Defects of different scales such as pores, joints, cracks and dislocations are naturally formed in rocks in the long geological history process and uneven initial damages exist in rocks [ 20 , 21 ], but the development of initial damage has a stress threshold. Under the continuous action of the stress level above this threshold, the uneven and localized damage evolution phenomenon occurs, thus resulting in aging deformation and failure [ 22 ].…”

Section: Comparative Analysis Of Full Stress-strain Curve and Creep Curve Of Uniaxial Compression Testsmentioning

confidence: 99%

A novel nonlinear creep model based on damage characteristics of mudstone strength parameters

Cui

et al. 2021

PLoS ONE

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Mudstone interlayer is a weak layer in rock engineering. When it is subjected to continuous stress higher than its damage threshold, due to the dislocation of particles in mudstone crystals and the expansion of cracks, mudstone strength is gradually damaged and deteriorated and the strain gradually increases, thus accelerating the phenomenon of creep damage. In order to describe the characteristics of the whole process of mudstone aging deformation, based on the damage evolution of strength parameters (cohesion and internal friction coefficient) with stress and time in mudstone creep tests, a novel damage nonlinear viscoelastoplastic body (D-NVPB) is proposed through improving traditional plastic element. D-NVPB describes the nonlinear characteristics of the accelerated creep stage of mudstone. With the element combination method, D-NVPB is connected with the Burgers model in series to form a new nonlinear damage creep model (D-NVEP model). The analysis results of creep characteristics theoretically verified the rationality of the model in describing the instantaneous elasticity, viscoelasticity, and nonlinear viscoplastic characteristics of the complete creep curve of mudstone. With the data obtained in the uniaxial compression creep test of mudstone under the action of a stress level of 14 MPa, based on the Levenberg-Marquardt nonlinear least squares method, the fitting calculation was performed through piecewise fitting and overall fitting. The correlation coefficient was 0.9909, which verified the applicability of the model. The obtained model parameters by the identification were used to predict the mudstone creep curve under the stress levels of 13 MPa and 15 MPa. The good prediction results further verified the feasibility of the model. Compared with the traditional creep model, the D-NVEP model can better describe the nonlinear characteristics of the accelerated creep stage and quantitatively display the strength damage evolution process of rock in the creep failure process.

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Experimental study on mechanical and damage characteristics of coal under true triaxial cyclic disturbance

Duan

Jiang

Yin

et al. 2021

Engineering Geology

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Fluctuation in residual strain and dissipated energy of saturated sandstone under tiered cyclic loading

Cited by 6 publications

References 39 publications

Experimental Study on Mechanical and Damage Evolution Characteristics of Coal during True Triaxial Cyclic Loading and Unloading

Experimental Study on Mechanical and Damage Evolution Characteristics of Coal during True Triaxial Cyclic Loading and Unloading

A novel nonlinear creep model based on damage characteristics of mudstone strength parameters

Experimental study on mechanical and damage characteristics of coal under true triaxial cyclic disturbance

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