A fluid‐solid coupling method for the simulation of gas transport in porous coal and rock media

Zhang, Cun; Liu, Jinbao; Zhao, Yixin; Guo, Jing

doi:10.1002/ese3.400

Cited by 21 publications

(8 citation statements)

References 39 publications

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“…The minimum sample size and the ratio of the maximum particle size of the sample must not be less Research shows that the Weibull distribution plays an important role in the study of rock size effects and strength theory [Feng et al, 2009;Zhang et al, 2019;Liang et al, 2021]. Therefore, The weibull distribution function is introduced to preset rock block size and parametric joint mechanical parameters.…”

Section: The Gradation Design and Model Assignmentioning

confidence: 99%

“…The macro-mechanical behavior (force chain evolution) and micro-spherical movement (particle displacement and rotation) of gangue under tri-axial and uniaxial compression were studied. Zhang [Zhang et al, 2019[Zhang et al, ,2020 points out that the proportion and structure of the coal-rock combination have an important influence on coal-rock compaction and the adjustment of void structure. Zhu [Zhu et al, 2018] proposed a method to construct a three-dimensional model of fractured rock mass, which inverses the compaction characteristics of fractured rock mass by assuming void ratios and randomly deleting blocks.…”

Section: Introductionmentioning

confidence: 99%

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Study on compaction and void ratio evolution law of various shape gangue in the gob of coal mine

Liu

Chen

et al. 2022

Preprint

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The gangue in gob is a porous material that is generated by breaking the overburden layers. The key governing factor in studying gas flow in gob is the reaction law of void ratios to overburden movement. The evolution of the bearing capacity and void ratios of the gangue during the compression process is investigated in this article. The results show that the compression simulation of Voronoi Tyson and Grain growth blocks can transparently represent the gangue compression process. The contact force between blocks decreases as particle size decreases, while the amount of contact force increases. The strong force chain is illustrated as a "hourglass" and a "hyperbola" in the model. The void ratio of the block gangue combination of particle size decreases in a quadratic function /negatively correlated with the increase of compression. This study is of great significance to the judgment of gas enrichment area.

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Section: The Gradation Design and Model Assignmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on compaction and void ratio evolution law of various shape gangue in the gob of coal mine

Liu

Chen

et al. 2022

Preprint

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“…However, they overlooked the influence of mobile water and residual water on the expansion stress in gasbearing coal seams. Zhang 20 feasibility of the numerical simulation method. Zhou 21 proposed an improved thermal solid−fluid coupling model to simulate the process of coalbed injection flue gas (CO 2 /N 2 ) to promote CBM extraction.…”

Section: Introductionmentioning

confidence: 99%

Fluid–Solid Coupling Characteristics of Methane-Containing Coal during Borehole Extraction of Coalbed: Numerical Modeling and Experimental Research

Yan,

Wen,

Jin

et al. 2023

ACS Omega

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The control and utilization of coalbed methane (CBM) are crucial for ensuring the safety of coal mining operations and mitigating greenhouse gas emissions. Predrainage of CBM from boreholes plays a pivotal role in preventing CBM accidents, harnessing CBM energy resources, and reducing greenhouse gas emissions. To better understand the evolution of key parameters during the predrainage process of CBM boreholes, this study, based on fundamental assumptions of coupling models, integrates the theories of elasticity, seepage mechanics, and fluid mechanics. It establishes a comprehensive mathematical model that reveals the interrelationships among the stress field, deformation field, and seepage field within methane-containing coal systems. By comparing numerical solutions with analytical solutions and conducting physical similarity simulation experiments, the study demonstrates the correctness of the methane-containing coal fluid–solid coupling model. The model developed in this study represents an improvement over traditional methane-containing coal seepage theories and fluid–solid coupling model theories and can be widely applied in the prevention of coal and CBM outbursts as well as CBM extraction.

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“…In China, most of the coal resources are buried deep underground. The original coal seam, the surrounding rock, and the coalbed methane constitute an equilibrium system that existed before the coal seam was mined . When coal mining is carried out, the overlying strata are damaged and collapse, which results in the formation of a curve subsidence zone, fracture zone, and caving zone .…”

Section: Introductionmentioning

confidence: 99%

Effect of roof movement on gas flow in an extremely thick coal seam under fully mechanized sublevel caving mining conditions

Guo

Cui

et al. 2019

Energy Science & Engineering

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The abnormal emission of gas in coals is the main factor that induces serious gas disasters in coal mines. During the coal mining process, roof movement has important effects on the gas emission law and gas flow characteristics. In this study, an extremely thick coal seam under fully mechanized sublevel caving mining conditions from the Tashan coal mine in China was used as an example; the effect of roof weighting on gas emission in the goaf was studied. Then, the large roof weighting step and the small roof weighting step caused by the different thicknesses of lamprophyre breakage were used as the objects and a numerical simulation study on the gas flow characteristics in the goaf was carried out. The results indicate that the mining coal seams, the overlying adjacent unmined coal seams, and the goaf are the main contributors to the large gas emission capacity, and even situations exist where the gas concentration exceeds the limit in the working face. During roof weighting, the gas concentration and emission capacity in the return airway, upper corner, and high drainage roadway increase substantially. The results of the numerical analysis are in good agreement with the observed data, which indicates that it is effective to control the gas in coal seams by designing the location of high drainage roadway according to the mining characteristics of coal seam and the gas emission law.

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A fluid‐solid coupling method for the simulation of gas transport in porous coal and rock media

Cited by 21 publications

References 39 publications

Study on compaction and void ratio evolution law of various shape gangue in the gob of coal mine

Study on compaction and void ratio evolution law of various shape gangue in the gob of coal mine

Fluid–Solid Coupling Characteristics of Methane-Containing Coal during Borehole Extraction of Coalbed: Numerical Modeling and Experimental Research

Effect of roof movement on gas flow in an extremely thick coal seam under fully mechanized sublevel caving mining conditions

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