Rheological Deformation Behavior of Soft Rocks under Combination of Compressive Pressure and Water-Softening Effects

Liu, Zhen; Zhou, Cuiying; Su, Dingli; Du, Zichun; Zhu, Fengxian; Zhang, Lihai

doi:10.1520/gtj20180342

Cited by 7 publications

(2 citation statements)

References 28 publications

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“…Zhang et al [ 8 ] established a nonlinear viscoelastic plastic model through multi-stage rheological tests of a coal body and verified the model. Liu et al [ 9 ] studied the rheological deformation of a soft rock specimen under the conditions of stress and water softening, explored the influence of stress and water on rock creep, and analyzed their mechanisms. Wang et al [ 10 ] introduced the damage variable that considers the proportion of irrecoverable plastic strain to the total strain, and established a new nonlinear multivariate creep model by connecting the newly proposed damage viscous body with the Hooken substance, the Saint Venant body, and the Kelvin element in series.…”

Section: Introductionmentioning

confidence: 99%

Research on the Creep Model of Deep Coal Roadway and Its Numerical Simulation Reproduction

Zhang

Wang

Ding

2022

IJERPH

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The long-term stability of coal mine roadway engineering is critical to the safe mining of coal resources and the protection of the surface environment. In this paper, the creep test of coal samples in coal roadway was carried out by multi-stage constant load method, and the test results showed that when the stress level was low, the creep curve had a attenuated stage and a steady-state stage, and the steady-state creep rate tended to increase with the increase in the stress level; When the stress level was higher than the yield stress, the creep rate curve appeared to have an acceleration stage after the steady-state stage. The instability failure mode of the coal sample was mainly shear failure with local tension failure. For this, a New Fractional-order Nonlinear Viscoelastic-plastic Rheological Model (NFNVRM) was established by introducing Abel elements and Nonlinear elements, and the constitutive equation of the model was deduced. The new model can fully reflect the stable decay stage and accelerated rheological stages of coal samples, and the parameter identification curve was consistent with the experimental results, which verifies the correctness and reasonableness of the NFNVRM. Meanwhile, based on the FLAC3D secondary development interface, the constitutive equations of the NFNVRM were written into the software to obtain new Dynamic Link Library (DLL) files. The simulation results were consistent with the experimental results when the DLL file was called. Finally, the NFNVRM.dll was applied to predict the surrounding rock deformation of an S mine. The study’s findings offer suggestions for environmental protection.

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Section: Introductionmentioning

confidence: 99%

Research on the Creep Model of Deep Coal Roadway and Its Numerical Simulation Reproduction

Zhang

Wang

Ding

2022

IJERPH

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“…Thus, the mechanical behaviour of the rock mass obviously deteriorates. At present, many achievements have been made in the study of waterrock interactions at home and abroad, such as the physical and mechanical properties of rock under the water-rock coupling effect [6][7][8] and the strength softening mechanism of soft rock under water [9][10][11][12]. Investigation results show that the dilatancy of rock will gradually decrease to a stable state with an increasing number of water loss cycles and water absorption tests [13][14][15], and the strength and deformation are seriously affected by the water-rock coupling effect [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Damage and Deterioration Behaviour of Deep Soft Rock under Water-Rock Interaction

et al. 2021

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The ageing disintegration, the damage, and failure mechanism of water-saturated soft rock are of significance to hazard prevention for deep mining. In this paper, indoor experiments, including disintegration behaviour tests in water, uniaxial compression failure tests of rock samples with different water contents, and variations in the microstructure of mudstone under saturated water contents, were conducted. The investigation results show that the saturated water content of mudstone is 16.96% and that the rock mass bursts completely after being immersed in water for 72 h. With increasing water content, the uniaxial strength and elastic modulus at the prepeak stage present significant attenuation. However, Poisson’s ratio varies little, which indicates that the swelling of cemented mudstone is not obvious when meeting water. In addition, the failure pattern of mudstone changes from overall splitting failure to block fragmentation failure. Due to ion-exchange adsorption and the wedging action of water molecules, the edge of contact between particles changes from staggered to smooth, which leads to the expansion of pores, the loosening of mudstone structures, and a decrease in mechanical strength. Therefore, the diffusion, migration, and particle expansion of illite and other clay minerals in mudstone are the main factors leading to the structural damage and strength reduction of weakly cemented rock under water-rock interactions.

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A Meso/Macroscale Theoretical Model for Investigating the Large Deformation of Soft Rock Tunnels Considering Creep and Anisotropic Effects

et al. 2023

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The rheological deformation of soft rock resulting from tunnel excavation can lead to significant construction and safety challenges. In this study, a multiphase numerical model was developed to simulate the rheological deformation of soft rock surrounding a tunnel after excavation. The developed model considers the coupled meso/macroscale creep and damage processes of the rock using the coupled discrete element method–finite element method (DEM–FEM). In particular, the damage and deformation accumulation at the mesoscale (i.e., initial phase before excavation, loading phase due to the disturbance of the excavation and creep-induced damage phase leading to large deformation) were incorporated into the model. The model predictions were validated using field monitoring data. By incorporating the coupled meso/macroscale deformation process of the rock into the model, the predicted time-dependent displacements of the tunnel face agree reasonably well with the monitoring data. In addition, the results demonstrate that tunnel brittle damage accumulated in mineral clusters severely leads to instantaneous deformation, which becomes less important in the creep evolution stage. Furthermore, the results indicate that the final deformation is characterized by a high sensitivity to the value of mesoscale modeling parameters.

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Rheological Deformation Behavior of Soft Rocks under Combination of Compressive Pressure and Water-Softening Effects

Cited by 7 publications

References 28 publications

Research on the Creep Model of Deep Coal Roadway and Its Numerical Simulation Reproduction

Research on the Creep Model of Deep Coal Roadway and Its Numerical Simulation Reproduction

Experimental Study on the Damage and Deterioration Behaviour of Deep Soft Rock under Water-Rock Interaction

A Meso/Macroscale Theoretical Model for Investigating the Large Deformation of Soft Rock Tunnels Considering Creep and Anisotropic Effects

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