Abstract
Studying the evolution of characteristics associated with the energy of gas-bearing coal is essential for exploring the mechanism of coal and gas outbursts and disaster prevention. In this paper, uniaxial compression and acoustic emission (AE) localization experiments were conducted using coal under different gas pressures. The mechanical characteristics, AE parameters and energy evolution of coal were analyzed and compared. The mechanism of the influence of gas on the mechanical characteristics of coal was studied. The connection between the destruction and the energy evolution of coal was revealed. The research showed that gas pressure can induce considerable initial damage inside coal. The compressive strength of coal decreased by 65.82% as the gas pressure increased from 0 to 4 MPa. The energy evolution and the failure characteristics of coal were closely related to the gas pressure. At low pressure, coal underwent elastic deformation before failure, elastic strain energy dominated during the loading process, and slight damage was observed after failure. Based on these observations, the ratio of dissipated energy to elastic energy (\(U_{\rm d} /U_{\rm e}\)) was used to characterize the severity of the damage. The ratio increased from 0.161 to 2.189 as the gas pressure increased from 0 to 4 MPa. Mild, weak and strong failure occurred when \(U_{\rm d} /U_{\rm e} < 0.5\), \(0.5 \le U_{\rm d} /U_{\rm e} < 1\), and \(U_{\rm d} /U_{\rm e} \ge 1\), respectively. The results of this study will contribute to future studies of the mechanism of coal and gas outbursts and will provide guidance for the prediction and prevention of outbursts.
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This work was funded by the National Natural Science Foundation of China (Nos. 51934007); Graduate Innovation Program of China University of Mining and Technology (Nos. 2023WLKXJ054); Postgraduate Research & Practice Innovation Program of Jiangsu Province (Nos. KYCX23_2657).
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Zheng, W., Gao, F., Du, M. et al. Research on Energy Evolution and Failure Characteristics of Coal with Different Gas Pressures. Nat Resour Res 32, 2137–2158 (2023). https://doi.org/10.1007/s11053-023-10231-2
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DOI: https://doi.org/10.1007/s11053-023-10231-2