Rock mechanical failure characteristics and energy evolution analysis of coal-rock combination with different dip angles

Shen, Wenbing; Yu, Weijian; Pan, Bao; Li, Ké

doi:10.1007/s12517-021-09268-5

Cited by 6 publications

(1 citation statement)

References 4 publications

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“…The energy of coal and rock was mainly distributed in the weak coal and rock layers, and no matter what kind of combination, the proportion of coal-part energy was more than 50%. Shen et al [31] studied the strength and deformation failure characteristics of coal-rock assemblages with different dip angles (0 • , 15 , and 60 • ) of the coal-rock contact surface and found that for a dip angle below 30 • , the cracks were mainly distributed in the coal body, the integrity of the rock mass was good, tensile shear failure occurred above a dip angle of 45 • , cracks penetrated through the coal-rock mass, the coal mass cracks were numerous and dense, and the rock mass had deep cracks. In a study by Xia [32] and Zhang [33], as the coal inclination angle rose, the elastic modulus and peak strength gradually decreased, and the damage value gradually increased while the strain at the same damage value gradually decreased.…”

Section: Introductionmentioning

confidence: 99%

Research on Mechanical Properties and Energy Evolution Law of Coal–Rock Assemblage with Different Gas Pressures

et al. 2022

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In order to study the mechanical failure characteristics and energy evolution law of gas-bearing coal–rock composites under different gas pressures, a uniaxial mechanical loading experiment was carried out on an upper-rock lower coal binary coal–rock assembly under different gas pressures. The changes in parameters such as compressive strength and elastic energy of the coal–rock combination were analyzed, and the energy transfer in the failure process of the gas-bearing coal–rock assemblage was studied. The results showed that the compressive strength of the combined body decreased linearly with the increase in gas pressure, and the decreasing rate of compressive strength was 6.4%, 16.3%, and 21.4%. The elastic modulus of the combined body decreased with the increase in gas pressure in a power function relationship. The energy accumulated before the peak of the rock part of the composite body and the elastic energy released after the peak, the energy accumulated before the peak of the composite body, and the energy dissipated after the peak of the coal body part all decreased with the increase in gas pressure. The variation range of the indicators K1 and K2, which reflect the influence degree of the partially accumulated elastic energy of the rock on the failure of the assemblage, were 5.85~6.68% and 7.34~9.46%, respectively.

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Section: Introductionmentioning

confidence: 99%