Fracture response and damage evolution features of coal considering the effect of creep damage under dynamic loading

Ding, Zeng; Feng, Xiaoting; Wang, Enyuan; Sa, Libin; Wang, Dongming; Zhang, Qiming; Hu, Qinjing; Zhao, Xue

doi:10.1016/j.engfailanal.2023.107204

Cited by 25 publications

(3 citation statements)

References 53 publications

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“…This indicates that the macro-fractures develop and asperities slide mainly in the post-peak regions. In comparison with the intact coal samples, the values of dissipative energy variation rate for the fractured coal samples are 2-3 times lower, which means that fracture coal undergoes less abrupt damage in the post-peak regions and shows plastic behavior [53,54].…”

Section: Dissipative Energy Variation Rate Analysis Of Intact and Fra...mentioning

confidence: 92%

Comparison of Energy Evolution Characteristics of Intact and Fractured Coal under True Triaxial Progressive Stress Loading

Liu,

Zhao,

Yin

et al. 2023

Sustainability

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The underground coal mining process is closely associated with frequent energy storage and consumption of coal mass with natural and induced fractures. Exploring the energy evolution characteristics of intact and fractured coal samples could be helpful for dynamic disaster control. In this study, laboratory true triaxial tests on the energy evolution characteristics of intact and fractured coal samples have been carried out and systematically discussed. The results show that the brittleness and peak strength are weakened due to the presence of macro-fractures in coal. The mean peak strength and brittleness for fractured coal are 29.00% and 74.59% lower than the intact coal samples. For both intact and fractured coal, the energy evolution curves are closely related to the deformation stages under true triaxial stresses. When subjected to the same intermediate stress, intact coal stores more elastic strain energy compared to fractured coal. Additionally, the rate of dissipative energy variation is two–three times lower in fractured coal samples compared to intact coal samples.

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Section: Dissipative Energy Variation Rate Analysis Of Intact and Fra...mentioning

confidence: 92%

Comparison of Energy Evolution Characteristics of Intact and Fractured Coal under True Triaxial Progressive Stress Loading

Liu,

Zhao,

Yin

et al. 2023

Sustainability

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“…Speeding up the advancing speed of working face is the most effective ways to stop coal from spontaneously burning. As the completely mechanized mining face continues to advance, the roof and surface continues to fall and compact [34,35], and the air flow state also changes accordingly.…”

Section: Applicationmentioning

confidence: 99%

Numerical Investigation of the Evolution of Gas and Coal Spontaneously Burned Composite Disaster in the Goaf of Steeply Inclined Coal Seam

Feng

Xue-bo

et al. 2023

Sustainability

Self Cite

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As the coal mine gets deeper and the stopes’ structures become more complex, gas and coal spontaneously burned composite disaster seriously threatens the efficient operation of coal mines. To study the interaction process and disaster-causing mechanism of gas and coal spontaneous combustion (GCSC), this paper establishes a numerical model to study the influence of drilling location/pressure and N2 injection on the evolution of gas and coal spontaneously burned composite disaster in the goaf. The simulation shows that in the central part of the goaf, a combined area of gas and coal combustion poses a possibility of spontaneous combustion calamity, and the length of the compound disaster area is about 20 m. The methane (CH4) explosion zone and the dioxygen(O2) temperature rise zone do not overlap in the air entrance roadway and return air roadway, indicating that there is no risk of compound disasters. The optimal nitrogen (N2) injection rate for this working face is 2000 m3/h, and the N2 port should be located 25 m profound into the goaf, which can effectively drive the diffusion of N2 and narrow the O2 zone’s breadth. The findings have considerable engineering applications for revealing the evolution process, risk assessment and control for GCSC compound disasters in coal mines.

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“…Shan [27] carried out uniaxial and triaxial loading experiments on coal rocks and analyzed the relationship between confining pressure and the strength and deformation failure characteristics of coal rock. Rock bursts are the result of the sudden instability of a coal rock system and the rapid release of energy [28][29][30]. When a rock burst occurs, the roof of the coal rock will sink violently, the energy flowing into the coal body will increase rapidly, and the energy of the coal rock system will gather, dissipate, and lose balance [31,32].…”

Section: Introductionmentioning

confidence: 99%

Study on the Energy Evolution Law and Bursting Liability of Coal Failure with Different Joint Inclination Angles

Yin,

Li,

Song

et al. 2024

Applied Sciences

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Joints are the weak plane structures in coal. The existence of joints leads to coal failure, with different fracture modes and energy evolution laws. In this paper, the energy evolution and bursting liability index of coal failure with different joint inclination angles (JIAs) are analyzed. The results show that with an increase in joint inclination angle (JIA), the total energy and elastic energy of coal first decrease and then increase and the dissipation energy decreases gradually. The existence of joints changes the bursting liability of coal. With an increase in the JIA, the uniaxial compressive strength (Rc) of coal first decreases and then increases, the dynamic failure time (DT) gradually decreases, and the impact energy velocity index (WST) and the impact energy index (KE) gradually increase. With an increase in the JIA, coal went from tensile failure to shear failure and tension shear mixed failure. After coal failure, the fractal dimension was between 1.7 and 2.4, decreasing first and then increasing; the larger the JIA and the degree of fragmentation, the more energy consumed at the moment of failure and the stronger the bursting liability of coal. The results have a guiding significance for the monitoring and prevention of rock bursts in coal mines.

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Fracture response and damage evolution features of coal considering the effect of creep damage under dynamic loading

Cited by 25 publications

References 53 publications

Comparison of Energy Evolution Characteristics of Intact and Fractured Coal under True Triaxial Progressive Stress Loading

Comparison of Energy Evolution Characteristics of Intact and Fractured Coal under True Triaxial Progressive Stress Loading

Numerical Investigation of the Evolution of Gas and Coal Spontaneously Burned Composite Disaster in the Goaf of Steeply Inclined Coal Seam

Study on the Energy Evolution Law and Bursting Liability of Coal Failure with Different Joint Inclination Angles

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