The effect of carbon dioxide treatment on micro-crack propagation of bituminous coals

Zhu, Jie; Tang, Di; Shao, Tangsha; Wang, Qi; Tang, Jun; Sun, Wei

doi:10.1007/s40948-020-00182-w

Cited by 5 publications

(4 citation statements)

References 35 publications

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“…Except for the main cracks, there are many branch cracks on the failure samples. The high occurrence area of branch cracks is generally the place where the growth rate of the main crack slows down [33].…”

Section: Microcrack Propagation Processmentioning

confidence: 99%

“…The high occurrence area of branch cracks is generally the place where the growth rate of the main crack slows down [33]. The size parameters and fractal dimensions of main cracks are listed in Table 5.…”

Section: Microcrack Propagation Processmentioning

confidence: 99%

“…The dissipated energy is equal to the area (S ap ) enclosed by load and displacement of the post-peak stage, as shown in Figure 9. The ratio of the dissipated energy (S ap ) to the accumulated energy (S bp ) is expressed by the energy accumulation dissipation index α, that is [33]:…”

Section: Fracture Energy Analysismentioning

confidence: 99%

“…Due to simple operation and easy machining, a three-point bending experiment is always used to measure the fracture toughness of materials. Numerous scholars have studied the effects of sample size [30], incision-to-depth ratio [31][32][33], loading rate [34], temperature [35,36], and bedding angle [37,38] on the fracture parameters of quasi-brittle materials. Agioutantis et al [8] through the acoustic emission technology detected the crack evolution of marble under three-point bending conditions.…”

Section: Introductionmentioning

confidence: 99%

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Multiscale Pore Structure Characteristics and Crack Propagation Behavior of Coal Samples from High Gas Seam

Zhu

Shao

et al. 2022

Materials

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Investigation on the pore-fracture features and crack propagation behavior of coal is necessary to prevent coal mine disasters. The pore structure features of coal samples taken from high gas seam were obtained by mercury injection porosimetry (MIP) and gas adsorption methods. The process of deformation and failure for coal samples under three-point bending conditions were obtained. The results demonstrate that the adsorption pores with diameter less than 100 nm are the most developed and their surfaces are the roughest (the average surface fractal dimension Ds is 2.933). The surface of micro-cracks is smoother (Ds is 2.481), which is conducive to gas seepage. It may be the explanation for that 14-3# coal seam is a high gas seam, while there was almost no gas outburst accident so far. At the initial stage of crack propagation, the main crack on the coal sample expanded along the direction of the natural cracks. In the process of crack propagation, the surface fractal dimension of the main crack increased, suggesting that the bending degree of the main crack enhanced. The brittle characteristics of coal samples can be reflected by the ratio of the dissipated energy to the accumulated energy.

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Section: Microcrack Propagation Processmentioning

confidence: 99%

Section: Microcrack Propagation Processmentioning

confidence: 99%

Section: Fracture Energy Analysismentioning

confidence: 99%