PLoS ONE, Journal Year: 2024, Volume and Issue: 19(2), P. e0297753 - e0297753

Published: Feb. 9, 2024

CO2 blasting has been identified as a potent method for enhancing the permeability of coal seams and improving gas drainage efficiency. This study is focused on elucidating deformation fracture mechanisms rock during identifying precursor characteristics these processes. To this end, blasting-induced pressure model distribution were developed. The research utilized self-developed test platform along with non-contact full-strain field measurement analysis system. Briquette samples subjected to tests under controlled experimental conditions, which included an axial 1.0 MPa variable pressures 0.5, 1.0, 1.5 MPa. methodology enabled capture principal strain surface samples. Gray Level Co-occurrence Matrix (GLCM) was employed extract analyze grayscale texture features cloud maps, facilitating quantitative assessment their evolution. aim pinpoint associated cracking crack propagation. results revealed that: (1) During subsequent propagation samples, field's histogram underwent transformation from "broad low" "narrow high" configuration, consistent increase in peak frequency. Specifically, at 3 ms, primary observed sample, evidenced by frequency 0.0846. By 9 propagated, escalated 0.1626. (2) feature parameters experienced initial abrupt change 3ms. Correlation indicated that initiation moment sample. (3) A secondary shift occurred 9ms, conjunction phenomena, phase. Monitoring proved effective recognizing potential reduce costs mines, optimize effects, provided theoretical guidance extraction efficiency deep low seams.

Language: Английский