Mechanical properties of rock–coal bi-material samples with different lithologies under uniaxial loading

Yin, Dawei; Chen, Shaojie; Yao, Ge; Li, Rui

doi:10.1016/j.jmrt.2020.12.010

Cited by 72 publications

(33 citation statements)

References 28 publications

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“…An AG-X250 servo-controlled testing system (Shimadzu, Kyoto, Japan) was used to perform the short-term uniaxial creep tests on the composite samples [12][13][14]20]. The AE…”

Section: Test Systemmentioning

confidence: 99%

“…An AG-X250 servo-controlled testing system (Shimadzu, Kyoto, Japan) was used to perform the short-term uniaxial creep tests on the composite samples [12][13][14]20]. The AE event was selected to analyze the AE characteristics of composite samples during creep loading, which was monitored using a PCI-2 AE system (MISTRAS, Princeton, NJ, USA) by MISTRAS.…”

Section: Test Systemmentioning

confidence: 99%

“…Generally, these composite structures were simplified to the rock-coal, coal-rock, and rock-coal-rock composite samples with a bonded or frictional interface to study their mechanical behaviors in previous experimental and numerical simulation investigations . These studies focused on the effects of the height ratio of coal to rock [12,22,[31][32][33], the interface between rock and coal [11][12][13][14]19], the composite model [36], the loading conditions (uniaxial loading, triaxial loading, cyclic loading and unloading, and true triaxial loading) [14,21,24,25,27,34,35], the defects within the coal or rock, and the mechanical properties (strength, stiffness, lithology, etc.) of rock or coal [19,20,26] on the strength, deformation, energy evolution, electromagnetic radiation characteristics [28,29], acoustic emission (AE) characteristics, and failure properties of composite samples.…”

Section: Introductionmentioning

confidence: 99%

“…These studies focused on the effects of the height ratio of coal to rock [12,22,[31][32][33], the interface between rock and coal [11][12][13][14]19], the composite model [36], the loading conditions (uniaxial loading, triaxial loading, cyclic loading and unloading, and true triaxial loading) [14,21,24,25,27,34,35], the defects within the coal or rock, and the mechanical properties (strength, stiffness, lithology, etc.) of rock or coal [19,20,26] on the strength, deformation, energy evolution, electromagnetic radiation characteristics [28,29], acoustic emission (AE) characteristics, and failure properties of composite samples. These above achievements are of great significance to understand mechanical characteristics of the composite structure consisting of coal pillar and surrounding rock layers.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Short-Term Uniaxial Creep Characteristics of Sandstone-Coal Composite Samples

et al. 2021

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In this investigation, the uniaxial short-term creep tests with multi-step loading were conducted on the sandstone-coal composite samples, and the characteristics of creep strength, creep deformation, acoustic emission (AE), and creep failure of composite samples were studied, respectively. The creep strength of the composite sample decreased with the stress-level duration, which was mainly determined by the coal and influenced by the interactions with the sandstone. The creep deformation and damage of sandstone weakened the deformation and damage accumulation within the coal, resulting in the larger strength for the composite sample compared with the pure coal sample. The axial creep strain of composite sample generally increased with the stress-level or the stress-level duration under same conditions. The AE characteristics of composite sample were related to the creep strain rate, the stress level, the stress level duration, and the local failure or fracture during creep loading. The micro or macro failure and fracture within the composite sample caused the rise in the axial creep strains and the frequency and intensity of AE signals, especially the macro failure and fracture. The creep failures of composite samples mainly occurred within the coal with the splitting ejection failure accompanied by the local shear failure, and no obvious failures were found within the sandstone. The coal in the composite sample became more broken with the stress-level duration.

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“…An AG-X250 servo-controlled testing system (Shimadzu, Kyoto, Japan) was used to perform the short-term uniaxial creep tests on the composite samples [12][13][14]20]. The AE…”

Section: Test Systemmentioning

confidence: 99%

Section: Test Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Study on the Short-Term Uniaxial Creep Characteristics of Sandstone-Coal Composite Samples

et al. 2021

Self Cite

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“…On the one hand, the extraction rotary hole that is needed in the process of gas drainage is destroyed. The adsorbed gas in the pores is connected to the outside through the main crack channel [4]. These two aspects will make the fire more serious.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the effect of high-temperature oxidation coal mechanical characteristics

Wang

et al. 2022

PLoS ONE

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After long-term oxidation and energy storage, broken coal body borehole walls and drainage shaft walls may cause spontaneous combustion during gas extraction. The high-temperature thermal shock caused by the spontaneous combustion of coal incurs thermal damage on adjacent coal, which, in turn, causes changes in the mechanical properties of the coal. However, only a few studies have been conducted in this context, which has limited our understanding of the thermal damage characteristics of coal bodies in such situations. This study aimed to experimentally investigate the correlation between the crack evolution law and the mechanical properties of coal bodies at different temperatures (50–300°C) using heat-force loading considering Ping Mei No. 10 coal mine as the research object. The results suggest that the coal body experiences a large amount of visible damage, and becomes increasingly complex. At 50–300°C, some indexes (such as longitudinal wave velocity, Poisson’s ratio, compressive strength, elastic modulus, impact energy index, and pre-peak strain) are positively correlated with temperature. In addition, the dynamic failure time and temperature show a negative correlation, and the overall change slope is small. The relationship between each index and temperature at 200–300°C is opposite to that at 50–200°C, and the overall change slope is larger. Moreover, when the oxidation temperature exceeds 200°C, the destruction of the coal body changes from elastic brittleness to ductility-plasticity. High-temperature oxidation incurs irreversible thermal damage of coal. Hence, it is necessary to focus on the changes in mechanical properties of coal after a spontaneous combustion process is extinguished.

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Experimental investigation of rock–shotcrete interface damage under dynamic splitting using digital image correlation and acoustic emission

Chen

et al. 2022

Structural Concrete

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Interface failure is the main type of rock–concrete structure failure, which affects the stability and safety. To study the interface crack propagation and damage characteristics, this article carried out the rock–shotcrete cube interface splitting test under different loading rates. The rock–shotcrete specimens are composed of four material types. Based on the nondestructive monitoring technology, digital image correlation and acoustic emission (AE) were used to monitor the whole process of splitting failure. The results indicate that, both peak load and critical displacement exhibit significant strain rate effects. The main stage of interfacial microcrack development is between 0.8 Pmax and Pmax. And the damage evolution of cracks is more sufficient and stable under low loading rate. The splitting damage at the rock–shotcrete interface shows phased characteristics. When the load is near the peak, the surge of the AE signal indicates that the damage is intensified.

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Mechanical properties of rock–coal bi-material samples with different lithologies under uniaxial loading

Cited by 72 publications

References 28 publications

Experimental Study on the Short-Term Uniaxial Creep Characteristics of Sandstone-Coal Composite Samples

Experimental Study on the Short-Term Uniaxial Creep Characteristics of Sandstone-Coal Composite Samples

Experimental study on the effect of high-temperature oxidation coal mechanical characteristics

Experimental investigation of rock–shotcrete interface damage under dynamic splitting using digital image correlation and acoustic emission

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