Damage Evolution and Failure Mechanism of Coal Sample Induced by Impact Loading under Different Constraints

Ji, Dongliang; Zhao, Hongbao; Vanapalli, Sai K.

doi:10.1007/s11053-022-10156-2

Cited by 11 publications

(2 citation statements)

References 95 publications

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“…Xu et al [26] used uniaxial compression tests to determine the mechanical properties and bursting liability of specimens of coal-rock composites with rock partings with diferent dip angles and thicknesses. Ji et al [27] combined with Weibull distribution to construct a creep damage constitutive model that can describe the whole process of coal-rock creep and analyzed the impact of impact disturbance on coal-rock creep damage under diferent initial creep stress and diferent impact energy.…”

Section: Introductionmentioning

confidence: 99%

A Bursting Liability Evaluation Method Based on Energy Transfer

Hou,

Zhao,

Zhao

2024

Shock and Vibration

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As coal mining gradually moves to deep earth, rock bursts have emerged as one of the main disasters threatening the safety of coal production. It is beneficial to conduct economic and effective prevention and control work by evaluating the bursting liability and improving the bursting liability evaluation system. In this paper, based on the energy transfer model, the relationship between the bursting energy index and the mechanical parameters of coal bodies is obtained by testing the bursting liability of 16 coal seams stratified in three coal mines. According to the bursting energy index and the elastic energy index, the parameter φ is defined to represent the energy release ratio of coal. This paper thus presents a method to evaluate the bursting liability as the product of the energy release ratio and energy transfer ratio and provides a definition for the energy transfer index. The results show that the bursting energy index of coal is closely related to its mechanical parameters. The prepeak deformation energy exhibits a strong positive correlation with uniaxial compressive strength and peak strain. The energy release ratio parameter φ and bursting energy index have high sensitivity and wide applicability. The results of the energy transfer index Ω = βφ are consistent with the results of bursting liability identification, which can better reflect the bursting liability, and can be used as the basis for judgment when the “∗” result is obtained in bursting liability identification. It is anticipated that this approach will become an important evaluation index for bursting liability identification.

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Section: Introductionmentioning

confidence: 99%

A Bursting Liability Evaluation Method Based on Energy Transfer

Hou,

Zhao,

Zhao

2024

Shock and Vibration

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“…When the water content is higher than 6%, the effect of the water content on permeability is gradually weakened. The water content also plays a role in coal deformation. − The swelling of moist coal in methane and carbon dioxide was analyzed by Day et al, and they observed that the effective compression coefficient of coal pores is reduced with the increase of moisture content, which accounts for the decrease of gas desorption and permeability. Subsequently, a permeability model considering adsorption deformation was established for the moist coal samples.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Evaluation of the Influence of Injected Water on Methane Desorption Behaviors of Coal in the Ordos Basin

Zou,

Liu,

Nie

et al. 2023

Energy Fuels

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Hydraulic fracturing technology is widely utilized to enhance gas drainage efficiency in underground coal mines. Water plays a crucial role in gas migration within coal after water is injected into the coal seams. In this study, methane desorption behaviors of coal were quantitatively evaluated under the influence of the injected water content. X-ray photoelectron spectroscopy (XPS), mercury intrusion porosimetry (MIP), and methane desorption experiments were combined to reveal the influencing mechanism. XPS results show that sample DLT also has the greatest content of the total oxygen-containing groups, which is 99.67% and 176.55% higher than those of samples HJH and BJG, respectively. MIP results indicate that sample DLT has the smallest pore volume (0.0315 cm3/g) and pore surface area (2.79 m2/g), while sample BJG shows the largest pore parameters. It is confirmed that the pore structures of anthracite are more complex than those of bituminous coals. Methane desorption characteristics of anthracite and bituminous coal are affected by injected water to varying degrees. Gas desorption in bituminous B is the most sensitive to the injected water content, and only 6% of the water content triggers a 46.83% reduction of the methane desorption capacity, which is attributed to the less accessible pore space and more hydrophilic oxygen-containing groups. Due to the highly developed pore networks and less oxygen-containing groups, CH4 molecules are replaced by H2O molecules in anthracite at the lower injected water content (<6%), resulting in the increase of the desorption capacity. The higher water content (>6%) accounts for the pore-blocking effect, resulting in the abrupt reduction of the gas desorption capacity.

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