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 

机构地区：[1]Department of Safety Science and Engineering,China University of Petroleum(East China),Qingdao 266580,China [2]School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China

出　　处：《International Journal of Mining Science and Technology》2023年第12期1511-1525,共15页矿业科学技术学报（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(No.52104236);the Fundamental Research Funds for the Central Universities(No.22CX06018A);the China Postdoctoral Science Foundation(No.2020M672177).

摘　　要：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 strengthening action ability,and the weakening action ability.The entire process is implemented by changing the dominant action of in situ stress into the dominant action of gas pressure.The failure strength of coals is not only affected by its original mechanical strength,but also by the stress loading and unloading paths,showing a particularly significant effect.Three stages can be divided during outburst inoculation process.That is,firstly,the coals suffer from initial damage through the dominant action of in situ stress with synergy of gas pressure;secondly,the coa

关 键 词：Coal and gas outburst Outburst mechanism Main controlling mechanism Coal damage Mining stress Dilatation phenomenon 

分 类 号：TD713[矿业工程—矿井通风与安全]