Mechanism of gas pressure action during the initial failure of coal containing gas and its application for an outburst inoculation

作者：Chaojie Wang, Lutan Liu, Xiaowei Li, Changhang Xu, Kai Li · 发表于：International Journal of Mining Science and Technology · 年份：2023 · DOI：10.1016/j.ijmst.2023.11.001 · 被引用次数：40 · 研究领域：Coal Properties and Utilization、Rock Mechanics and Modeling、Earthquake Detection and Analysis

Faced with the continuous occurrence of coal and gas outburst (hereinafter referred to as “outburst”) disasters, as a main controlling factor in the evolution process of an outburst, for gas pressure, it is still unclear about the phased characteristics of the coupling process with in situ stress, which induce coal damage and instability. Therefore, in the work based on the mining stress paths induced by typical outburst accidents, the gradual and sudden change of three-dimensional stress is taken as the background for the mechanical reconstruction of the disaster process. Then the true triaxial physical experiments are conducted on the damage and instability of coal containing gas under multiple stress paths. Finally, the response characterization between coal damage and gas pressure has been clarified, revealing the mechanism of action of gas pressure during the initial failure of coals. And the main controlling mechanism during the outburst process is elucidated in the coupling process of in situ stress with gas pressure. The results show that during the process of stress loading and unloading, the original gas pressure enters the processes of strengthening and weakening the action ability successively. And the strengthening effect continues to the period of large-scale destruction of coals. The mechanical process of gas pressure during the initial failure of coals can be divided into three stages: the enhancement of strengthening action ability, the decrease of strengthen...