Mechanical and Failure Characteristics of Rock-coal-rock Combined Body under Different Strain Rates: A Numerical Study from Micro Perspective

Dong, Shuning; Li, Ang; Ji, Yadong; Yang, Yuxuan; Mu, Qian

doi:10.1007/s10706-020-01485-1

Cited by 9 publications

(5 citation statements)

References 11 publications

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“…Coal and rock will release energy in the form of elastic waves (acoustic 10 Geofluids emission) during its deformation and failure process [16]. By analyzing acoustic emission parameters, the characteristics of coal and rock deformation and failure can be better understood.…”

Section: Acoustic Emission Characteristic Analysismentioning

confidence: 99%

“…Du and Wang [13] explored the failure characteristics of CRCB through the true triaxial test. Chen et al, Zhao et al, and Dong et al [14][15][16] obtained the fracture propagation mode of CRCB under different loading conditions through theoretical analysis and laboratory experiments. The above research on the failure characteristics of CRCB is mainly aimed at intact coal-rock assemblages.…”

Section: Introductionmentioning

confidence: 99%

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Crack Propagation Law and Failure Characteristics of Coal-Rock Combined Body with the Different Inclination Angle of Prefabricated Fissure

et al. 2021

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Few studies have been conducted on the crack propagation law and failure characteristics of coal-rock combined body (CRCB) with prefabricated fissure. A sliding crack model was firstly presented to analyze the failure law of rock with a single fracture and the influence of the inclination angle of the fracture on the strength of the rock. The RFPA numerical models of the CRCB with different inclination angles of prefabricated fracture were then established to simulate the dynamic change process of crack propagation and shear stress of the CRCB with prefabricated fracture under uniaxial compression. The influence of the inclination angle of the fracture in the rock on the fracture expansion and failure characteristics of CRCB was further analyzed based on the acoustic emission data. The results showed that (1) when 2 β = arctan 1 / μ , σ cw takes the minimum value, and crack initiation is most likely to occur; (2) the strength of coal-rock assemblage shows different changing trends with the fracture inclination angle; (3) the secondary cracks of CRCB with prefabricated fracture of 0°, 15°, and 30° initiated and expanded near the tip of the main crack, and the secondary cracks of 45°, 60°, and 75° initiated and expanded from the tip of the main crack; (4) there are three failure modes of CRCB with prefabricated crack, the double-shear failure mode Λ , the tensile-shear composite failure mode along the fracture surface, and the tensile failure mode along the fracture surface; and (5) intact CRCB and CRCB with prefabricated crack when α = 75 ° and α = 90 ° have strong brittleness, and other CRCB with different prefabricated fracture inclination angles show a certain degree of postpeak plasticity. The results on the mechanical properties and damage characteristics of CRCB are of great significance for the safety and efficient mining of deep coal resources.

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Section: Acoustic Emission Characteristic Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crack Propagation Law and Failure Characteristics of Coal-Rock Combined Body with the Different Inclination Angle of Prefabricated Fissure

et al. 2021

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“…With the increase in the strength and stiffness of the rock, the strength and stiffness of the composite body also increased, and with an increase in the rock strength, the strain energy density of the coal-rock composite body increased rapidly and then decreased slowly. Dong et al [28] found that with an increase in strain rate, the peak strain, peak strength, and crack number all showed an increasing trend. Chen et al [29,30] studied the mechanical properties of binary and ternary combinations of 19 different coal-rock ratios and combinations and the energy transfer mechanism in the failure process and found that the composition of fine sandstone determined the mechanical properties and impact effects of the combination.…”

Section: Introductionmentioning

confidence: 99%

Research on Mechanical Properties and Energy Evolution Law of Coal–Rock Assemblage with Different Gas Pressures

et al. 2022

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In order to study the mechanical failure characteristics and energy evolution law of gas-bearing coal–rock composites under different gas pressures, a uniaxial mechanical loading experiment was carried out on an upper-rock lower coal binary coal–rock assembly under different gas pressures. The changes in parameters such as compressive strength and elastic energy of the coal–rock combination were analyzed, and the energy transfer in the failure process of the gas-bearing coal–rock assemblage was studied. The results showed that the compressive strength of the combined body decreased linearly with the increase in gas pressure, and the decreasing rate of compressive strength was 6.4%, 16.3%, and 21.4%. The elastic modulus of the combined body decreased with the increase in gas pressure in a power function relationship. The energy accumulated before the peak of the rock part of the composite body and the elastic energy released after the peak, the energy accumulated before the peak of the composite body, and the energy dissipated after the peak of the coal body part all decreased with the increase in gas pressure. The variation range of the indicators K1 and K2, which reflect the influence degree of the partially accumulated elastic energy of the rock on the failure of the assemblage, were 5.85~6.68% and 7.34~9.46%, respectively.

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“…Zhao et al 9 studied and analyzed the peak strength, strain, and failure mode of the coal‐rock structural body with the different structural plane inclination angles and established the energy evolution computational model of the structural body. Dong et al 10 obtained the relationship between loading rate and peak strain, strength, and crack number. Zhao et al 11 analyzed the effect of different lithologies on the mechanical and AE characteristics of the coal‐rock structural body.…”

Section: Introductionmentioning

confidence: 99%

Effect of confining pressure strength on the characteristics of energy evolution and fatigue fracture of the coal‐rock structural body

Li,

Yue,

et al. 2023

Fatigue Fract Eng Mat Struct

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The stability of coal seam‐overlying strata is significant to the safety of coal mines. The coal‐rock height ratio and confining pressure strength affect the stability of coal seam‐overlying strata. The research purpose of this paper is to obtain the effects of confining pressure and coal‐rock height ratio on the mechanical properties, energy evolution characteristics, and damage variables of structural body through the uniaxial loading, uniaxial cyclic loading, and triaxial cyclic loading experiment. Based on the evolution characteristics of the energy, the concept of energy dissipation ratio is put forward, and the effect of height ratio and confining strength on the energy dissipation ratio are compared and analyzed. The research results of this paper can provide theoretical reference for exploring the stress and energy evolution of coal seam‐overlying strata during chamber excavation and working face mining.

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Mechanical and Failure Characteristics of Rock-coal-rock Combined Body under Different Strain Rates: A Numerical Study from Micro Perspective

Cited by 9 publications

References 11 publications

Crack Propagation Law and Failure Characteristics of Coal-Rock Combined Body with the Different Inclination Angle of Prefabricated Fissure

Crack Propagation Law and Failure Characteristics of Coal-Rock Combined Body with the Different Inclination Angle of Prefabricated Fissure

Research on Mechanical Properties and Energy Evolution Law of Coal–Rock Assemblage with Different Gas Pressures

Effect of confining pressure strength on the characteristics of energy evolution and fatigue fracture of the coal‐rock structural body

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