Seepage and Damage Evolution Characteristics of Gas-Bearing Coal under Different Cyclic Loading–Unloading Stress Paths

Li, Qingmiao; Zou, Quanle

doi:10.3390/pr6100190

Cited by 33 publications

(16 citation statements)

References 35 publications

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“…The density of cracks and macropores can be used to determine the permeability and rate stress sensitivity. Li et al [44] affirmed that the permeability changes of coal samples under cyclic loading present three-stage characteristics. Jiang et al [42] revealed that with loading and unloading, the AE loop count rate and AE energy first slowly increased and subsequently increased rapidly in the yield stage and finally increased sharply in the destruction stage.…”

Section: Research On Coal Damage Under Cyclicmentioning

confidence: 98%

Research Progress of Coal Damage under Unsteady Load in China

Chen

Fan

et al. 2021

Geofluids

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Coalbed methane mining, suppression of coal dust, and elimination of dynamic disasters are closely related to the expansion of coal body cracks and internal damage. Understanding the expansion mechanism of pore-cracks is critical to investigate coal body damage. In this study, research from 2016 to 2021 conducted on the coal damage mechanism in China was sorted and the progress in this field was analysed to systematically investigate coal body damage. Critical topics of research in this field in recent years were identified, and load types were classified into static and dynamic loads. Dynamic loads with obvious characteristics and considerable damage-increasing effects were classified into impacting, cyclic, pulsating, and other dynamic load types. The current load-generating devices, various detection techniques and methods, research results, and the future research directions under various load types were discussed. The current coal damage research is primarily based on macrocharacteristic analysis and the stage characteristics of characterisation variables. The use of scanning electron microscopy, computerised tomography three-dimensional reconstruction technology, and acoustic emission technology can reveal the pore propagation mechanism at the micro level.

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Section: Research On Coal Damage Under Cyclicmentioning

confidence: 98%

Research Progress of Coal Damage under Unsteady Load in China

Chen

Fan

et al. 2021

Geofluids

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“…When the stress exceeds a specific value, the permeability increases with the increases of loading and unloading cycles. Conversely, the permeability decreases with the cyclic loading and unloading cycles [15][16][17].…”

Section: Introductionmentioning

confidence: 98%

Experimental Study on the Permeability Evolution and Gas Flow Law of Post-Strength Soft Coal

Hou

Jin

et al. 2020

Applied Sciences

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Permeability is an essential indicator for predicting gas drainage yield and preventing mine gas disasters, which is significantly influenced by the stress paths and the integrity of coal. Conventional research on permeability mainly focused on the permeability evolution of initial undamaged or fractured (prefabricated fractures) coal under various stress paths; little attention has been paid to post-strength coal (stress-induced damage), especially for soft coal. To determine the permeability evolution and gas flow law of post-strength soft coal samples under various stress paths, we used the experimental method combined with the numerical method in this study. The results showed that when the confining pressure and axial pressure of post-strength soft coal samples were unloaded, the permeability increased by 1.25–1.32 times; when the coal samples were loaded into the secondary damage, the permeability first decreased and then increased. The simulation part in this study found that the development of the fracture of coal samples under triaxial compression was divided into four stages. Gas flow law of post-strength soft coal was significantly influenced by fracture locations, and the gas pressure and gas flow field near the fracture were disturbed.

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“…Yang et al [2] established and discussed the energy-driving mechanism of combined coal-rock failure based on the mechanical response, energy evolution, and deformation and failure characteristics. Li et al [23] studied the seepage and damage evolution characteristics of gas-bearing coal under three cyclic loading and unloading stress paths. Zhang et al [15] characterized the damage evolution process of raw coal samples using acoustic emission positioning technology, proposed a timespace dimension cluster analysis method based on the kmeans algorithm, and determined useful information regarding instability signs.…”

Section: Introductionmentioning

confidence: 99%

Energy Variation Law and Rockburst Characteristics of Coal under Cyclic Loading

Guo

Liu

et al. 2021

Shock and Vibration

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Coal mining involves numerous challenges and safety risks owing to the complex engineering properties of coal bodies, which include discontinuities, heterogeneity, and anisotropy. In this paper, the strain energy during the coal deformation process is redivided in combination with cyclic loading and unloading tests to determine the energy evolution law and discuss the rockburst tendency characteristics. The results show that the elastic strain energy, and particularly the base-material strain energy, consistently dominates during the energy adjustment process, which is an important indicator of rockburst tendency. The elastic energy index and rebound deformation index also show that moderate plastic deformation (e.g., crack expansion and local penetration) can reduce the rockburst tendency level and prevent rockburst accidents. On the basis of the obtained results, precracking and pressure relief measures of blasting are adopted on site in advance of the working face, and good safety and economic benefits are achieved. These findings, thus, provide an important engineering reference for mines under similar conditions.

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Seepage and Damage Evolution Characteristics of Gas-Bearing Coal under Different Cyclic Loading–Unloading Stress Paths

Cited by 33 publications

References 35 publications

Research Progress of Coal Damage under Unsteady Load in China

Research Progress of Coal Damage under Unsteady Load in China

Experimental Study on the Permeability Evolution and Gas Flow Law of Post-Strength Soft Coal

Energy Variation Law and Rockburst Characteristics of Coal under Cyclic Loading

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