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Experimental investigation of mechanical properties, permeability and catastrophic mechanisms of gas contained bump-prone coal

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Abstract

The present paper focuses on the mechanical properties, permeability and energy variation within gas contained bump-prone coal, and, based on theoretical and experimental methods, the paper seeks to elucidate the complex mechanical mechanism of gas emissions with gradually varying states of stress and its catastrophic mechanisms. A triaxial test apparatus is developed specifically for stressed coal, taking the properties of gas adsorption and migration into consideration under stress conditions and providing simultaneous measurement of deformation and gas flux. The entire deformation process of coal samples with a danger of bump, obtained from a depth of 580 m in the Xinzhouyao colliery of northern China, was investigated by conventional triaxial compression experiments using various levels of confining pressure and gas. Sieve analysis was used to measure the post-failure coal fragments, and an empirical formula was developed to describe the new surface during coal failure. It was found that the existence of gas reduces cohesion and increases the internal friction angle, the strength decreases with increasing gas pressure, and the elastic modulus is gradually reduced by the influence of confining pressure. The angle of coal damage increases from the failure model of conjugate shear to single shear and tension shear with larger fractal dimensions. Permeabilities showed clear phase characteristics with coal deformation, and the theoretical analysis revealed that the gas energy is mainly derived from free gas in the fissures. With higher gas pressures and porosities of coal, larger amounts of energy were contained in the coal seams. As a consequence, the energy composition has a direct impact on disaster types, initiation and occurrence. A surplus energy evolution model and disaster tendency evaluation index for coal failure was developed and used to determine the instability type. These test results may help us gain insight into the mechanical coupling mechanism between coal and gas, even in deep mining where high in situ stresses and gas pressures may cause bump-outburst compound disasters.

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Funding

This work was supported by The National Key Research and Development Program of China (No. 2017YFC0804208), The National Natural Science Foundation of China (Nos. 51774164,969 51974186, 51974147) and The Liaoning Provincial Department of education project - young scientific and technological talents breeding project (LJ2020QNL001).

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Authors and Affiliations

  1. School of Mechanics and Engineering, Liaoning Technical University, Fuxin, 123000, China

    Xin Ding, Xiaochun Xiao, Di Wu, Yishan Pan & Jun Xu

  2. School of Civil and Resource Engineering, University of Science & Technology Beijing, Beijing, 100083, China

    Xiangfeng Lv

  3. Environmental Engineering College, Liaoning University, Shenyang, 110136, China

    Yishan Pan

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  1. Xin Ding
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  2. Xiaochun Xiao
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  3. Xiangfeng Lv
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  4. Di Wu
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  6. Jun Xu
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Correspondence to Xin Ding.

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Responsible Editor: Murat Karakus

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Ding, X., Xiao, X., Lv, X. et al. Experimental investigation of mechanical properties, permeability and catastrophic mechanisms of gas contained bump-prone coal. Arab J Geosci 14, 1068 (2021). https://doi.org/10.1007/s12517-021-07369-9

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