Quantitative visualization and characteristics of gas flow in 3D pore-fracture system of tight rock based on Lattice Boltzmann simulation

Hou, Peng; Liang, Xin; Gao, Feng; Dong, Jiabin; He, Jian; Xue, Yi

doi:10.1016/j.jngse.2021.103867

Cited by 59 publications

(27 citation statements)

References 47 publications

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“…CT is nondestructive detection technology and extensively used in the research of mesodamage mechanical properties and internal component analysis of porous material, such as coal and shale. It could realize continuous and multiple scanning records of different sections of the sample and also realize 3D reconstruction and display the three-dimensional structure of the sample [41][42][43][44][45]. The principle of CT is that Xrays passing through substances with different densities would be attenuated to varying degrees and show different colors (gray value) on the images.…”

Section: Results and Analysismentioning

confidence: 99%

Investigation on Pore-Fracture of Coal and Its Influence Mechanism on Tensile Failure Behavior of Coals with Bursting Proneness

Guo

Liu

et al. 2021

Geofluids

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Both computed tomography (CT) and notched semicircular bend (NSCB) tests are performed for coals with high and medium bursting proneness to extract the scientific expression of pore-fracture and its influence mechanism on the tensile failure behavior. The acoustic emission (AE) parameters in the sample during loading and failure are monitored, and the influence mechanism of pore-fracture on tensile failure behavior of coal is analyzed. The result illustrates that the spatial distribution feature of the pore-fracture in coals with high and medium bursting proneness is extremely different. The deformation and failure mode of the coals are affected by many factors, loading mode, notch depth and width, mechanical properties of matrix and minal, spatial distribution feature of pore-fracture, etc. The influence of primary pore-fracture in the coal on the extension and penetration of the secondary fracture could be divided into two types: bifurcation and promotion, which would cause different local damage in the sample and affect the final failure mode. The feature of acoustic emission parameters indicates that the deformation and failure process of a sample under loading could be divided into four stages: compaction stage, elastic deformation stage, displacement plastic growth stage, and post peak failure stage, which is the result of comprehensive action of many factors. The evolution process of secondary fracture is accompanied by the dissipation of elastic strain energy and the intensification of internal damage of coal, which reflects the failure process of coal.

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Section: Results and Analysismentioning

confidence: 99%

Investigation on Pore-Fracture of Coal and Its Influence Mechanism on Tensile Failure Behavior of Coals with Bursting Proneness

Guo

Liu

et al. 2021

Geofluids

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“…The field measurement of coal body permeability shows that with the decrease of the distance between the working face and the observation point, the permeability of the coal increases gradually from the fixed value due to mining, decreases slightly before approaching the peak stress, and then increases rapidly due to the coal entering the elastic-plastic or plastic state at the observation point. The permeability of the coal in the whole stress process is higher than the original permeability [27,28], as shown in Figure 4(b). After the coal body is affected by the front abutment pressure, the permeability is about 3-6 times of the original permeability.…”

Section: Limit Width Model Of Coal Pillar Spontaneousmentioning

confidence: 91%

Optimization of Barrier Pillar Design in Longwall Mining with Top Coal Caving in Spontaneous Combustion Coal Seam

Yang

Liu

et al. 2021

Geofluids

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Determining a reasonable barrier pillar along gob-side entry of spontaneous combustion coal seam is of great significance to the prevention of spontaneous combustion. In this paper, considering the actual situation of 4301 and 4302 working faces of II-class spontaneous combustion coal seam in Changheng Mine, the characteristics of rock mass collapse and mining-induced stress redistribution of barrier pillar and adjacent area were analyzed, the cusp catastrophe model of coal pillar instability and the theoretical model of limit width of coal pillar air leakage spontaneous combustion were established, and a measurement scheme of side abutment pressure in 4301 working face was carried out. The theoretical model of the coal pillar along the gob-side entry shows that its instability is related to density of overlying strata, physical and mechanical parameters of coal body, dip angle of coal seam and weak face, and buried depth and mining width of working face. And the coal pillar in 4302 working face will be unstable if the width a ≤ 6.8 m . Field measured data shows that 2-8 m is the stress-relaxation area of side solid coal. Then, the width of coal pillar was determined as 7 m. The maximum displacement of rib-to-rib and roof-to-floor of 4302 tailentry was 520 mm and 280 mm, respectively. The coal spontaneous combustion (CSC) observation monitoring results showed that the carbon monoxide volume fraction was in the normal range during the entire process of mining, and no other signs of gas were found. The research results can provide a reference for the barrier pillar designing in the mines under similar conditions.

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“…The coal mass can be divided into six stages from loading to failure [56][57][58]: (1) crack closure stage, (2) elastic stage, (3) development stage of tensile crack, (4) the development stage of macrocrack, (5) rock structure stage, and (6) residual strength stage. However, the proportion of the crack closure stage to the axial strain stage cannot be ignored.…”

Section: Constitutive Modelmentioning

confidence: 99%

Study on Mechanical Behavior and Seepage Characteristics of Coal Mass during Unloading

2021

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With the increase of buried depth, the content of gas increases gradually. The gas in the mining process will lead to gas gush and other dynamic disasters, or even coal and gas gushing in front of the working face. Therefore, the study on the permeability distribution of coal and the surrounding rock is the core work of coal and gas mining at the same time. To study the mechanical behaviors and seepage characteristics of coal mass during unloading is to prepare for coal and gas mining in the future, which can not only ensure the safety of operators to the maximum extent but also increase the mining rate as much as possible. Based on the stress-strain curve and seepage curve, the brittleness index and seepage characteristics of coal are analyzed. The greater the brittleness index is, the more likely the coal mass is to produce cracks, and then to form large cracks, or even fracture. Through the study of brittleness index and seepage characteristics of coal mass, the mechanical behavior of coal mass can be easily obtained, so as to guide the mining of coal mass.

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Quantitative visualization and characteristics of gas flow in 3D pore-fracture system of tight rock based on Lattice Boltzmann simulation

Cited by 59 publications

References 47 publications

Investigation on Pore-Fracture of Coal and Its Influence Mechanism on Tensile Failure Behavior of Coals with Bursting Proneness

Investigation on Pore-Fracture of Coal and Its Influence Mechanism on Tensile Failure Behavior of Coals with Bursting Proneness

Optimization of Barrier Pillar Design in Longwall Mining with Top Coal Caving in Spontaneous Combustion Coal Seam

Study on Mechanical Behavior and Seepage Characteristics of Coal Mass during Unloading

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