Abstract
Extensive bedding planes have a great influence on the mechanical properties of coal. In order to study the mechanism of the effects of bedding angles on the mechanical properties and failure characteristics of coal in the Shanxi Baode coal mine, uniaxial and triaxial compression tests and numerical simulations were conducted. The strength deterioration and microstructural changes in the samples were then analyzed with discrete element method (DEM) numerical simulation. The experimental results reveal that the power function strength criterion has good applicability to the strength characteristics of this coal. It was also found that the bedding angles have a great influence on the mechanical properties of coal. The properties of peak strength at different bedding angles roughly showed a U-shaped changing trend. The maximum strength occurred at a bedding angle of 0°, whereas the minimum strength occurred at a bedding angle of 60°. The numerical simulation and test results prove that the forms of failure of different bedding coal samples are complicated and are mainly represented by tensile and shear failures.
Highlights
IntroductionDue to the discontinuity of environmental conditions during the formation of coal, coupled with the crustal activity stress and geothermal effect after coal formation, coal generally develops at least two sets of approximately orthogonal primary fissures
Academic Editors: Bingxiang Huang, Coal is a type of sedimentary rock
Cai et al [4] conducted dynamic indirect tensile tests on coal samples to explore the influence of bedding structure on the dynamic indirect tensile strength
Summary
Due to the discontinuity of environmental conditions during the formation of coal, coupled with the crustal activity stress and geothermal effect after coal formation, coal generally develops at least two sets of approximately orthogonal primary fissures. These fissures are accompanied by holes, microcracks, joints, bedding and other weak structural planes [1]. Xu et al [3] carried out uniaxial compression tests on rocks with different joint inclinations. In order to study the mechanism of influence of the bedding structure on the mechanical properties of coal, a series of uniaxial compression tests and mesoscopic tests were carried out.
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