Failure energy evolution of coal–rock combination with different inclinations

Yu, Yongjiang; Liu, Jingjing; Yang, Yuntao; Wang, Pengbo; Wang, Zhenmeng; Song, Zhiyuan; Liu, Jiaming; Zhao, Shangqing

doi:10.1038/s41598-022-23813-6

Cited by 5 publications

(1 citation statement)

References 16 publications

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“…Sci. 2024, 14, 1120 2 of 16 combinations, and original cracks on the energy evolution of coal rock failure [19][20][21]. However, previous studies on energy evolution laws have mostly focused on intact coal rocks or rocks with joints.…”

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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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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Mesoscopic study on instability characteristics of residual coal pillars–roof system based upon domino effect in pillar goaf

Wang,

Li,

Lin

et al. 2023

Geomech. Geophys. Geo-energ. Geo-resour.

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The stability of pillar goaf is affected by the composite structure composed of residual coal pillars and roof, it is necessary to study the instability characteristics of residual coal pillars–roof system. Double coal pillar–roof combined bodies were constructed based on single coal pillar–roof combined body to characterize coal pillars–roof system in this paper. Through particle flow code (PFC), the instability modes of single combined body and double combined bodies with different combinations under uniaxial compression were studied from a mesoscopic perspective. With that, the instability criterions of double combined bodies were analyzed theoretically. The results show that the damage of single combined body and double combined bodies both have domino—type characteristics. During the single combined body is compressed, coal is broken firstly and induces rock damage. Meanwhile, the rock damage aggravates the destruction of coal in turn. Finally, the overall body loses bearing capacity based upon domino effect. During the double combined bodies with same mechanical properties are compressed, the component bodies bear the external load evenly and deform harmoniously. During the double bodies with different mechanical properties are compressed, the low-strength component body is destroyed and reaches its bearing limit firstly. Synchronously, the whole system reaches the bearing peak. Thereafter, the external load originally borne by low-strength body gradually transfers to high-strength body. The high-strength body also reaches the bearing limit over time, and the second bearing peak appears synchronously for the whole system. The instability of a single coal pillar is the initial cause of the instability of the whole coal pillars–roof system. The instability of any single component body can be regarded as the overall instability criterion for double bodies with same properties, while the instability of the single component body with high strength should be regarded as the instability criterion for double bodies with different properties.

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Study on mechanical properties and acoustic emission characteristics of mudstone-clay composites under uniaxial compression

Liu,

Yue

et al. 2024

Engineering Geology

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Failure energy evolution of coal–rock combination with different inclinations

Cited by 5 publications

References 16 publications

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

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

Mesoscopic study on instability characteristics of residual coal pillars–roof system based upon domino effect in pillar goaf

Study on mechanical properties and acoustic emission characteristics of mudstone-clay composites under uniaxial compression

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