Abstract
Coal and gas outburst is one of the most serious hazards in underground mine operations. In this paper, we explored the damage and gas seepage characteristics of gas-bearing coal samples with different pore structures under methane sorption-sudden unloading conditions using a self-developed experimental apparatus. The results show that (1) the deformation of coal samples can be divided into three stages, namely, pressure-increase-induced compression, sorption-induced expansion, and sudden-unloading-induced deformation or failure stage; (2) with the increase of the number of diffusion pores in the coal sample, the amount of gas sorption gradually increases and the expansion and failure of coal samples become more obvious; (3) in the experiment, the damage of coal samples is mainly along the axial direction and rarely along the radial direction; (4) the radial strain is always greater than the axial strain.
Highlights
Coal is an important energy source for human activities and engineering applications
The external conditions of this experiment are basically the same, so the difference of the data can be attributed to the change of the basic characteristics of the coal samples themselves
The relationship between the strain of the coal sample and the time is characteristic of the evolution of gas sorption-sudden unloading process, which is directly reflected in the axial strain and the radial strain
Summary
Coal is an important energy source for human activities and engineering applications. Many factors could cause disaster during coal mining including coal mine gas, water, and dust. Due to complexity of mining disaster-causing mechanisms, situation for safe mining production is extremely severe [1,2,3]. Coal and gas outburst is an extremely complex phenomenon of dynamic instability occurring in coal mines. Due to the complexity of coal and gas outburst mechanisms, more and more researches accepted the hypothesis that coal and gas outburst is the result of the combined effects of geological structure, gas migration, and the nature of coal samples [8,9,10,11,12,13]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
