Response characteristics of gas pressure under simultaneous static and dynamic load:Implication for coal and gas outburst mechanism  

作　　者：Longyong Shu Liang Yuan Qixian Li Wentao Xue Nannan Zhu Zhengshuai Liu 

机构地区：[1]School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China [2]Mine Safety Technology Branch,China Coal Research Institute,Beijing 100013,China [3]State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science&Technology,Huainan 232001,China [4]China Coal Research Institute,Beijing 100013,China

出　　处：《International Journal of Mining Science and Technology》2023年第2期155-171,共17页矿业科学技术学报（英文版）

基　　金：the financial support from the China Postdoctoral Science Foundation(Nos.2022M713384,and 2022M721450);the National Natural Science Foundation of China(Nos.52174187,51704164,and 52130409);the Technology Innovation Fund of China Coal Research Institute(No.2020CX-I-07).

摘　　要：Coal and gas outbursts are dynamic disasters in which a large mass of gas and coal suddenly emerges in a mining space within a split second.The interaction between the gas pressure and stress environment is one of the key factors that induce coal and gas outbursts.In this study,first,the coupling relationship between the gas pressure in the coal body ahead of the working face and the dynamic load was investigated using experimental observations,numerical simulations,and mine-site investigations.It was observed that the impact rate of the dynamic load on the gas-bearing coal can significantly change the gas pressure.The faster the impact rate,the speedier the increase in gas pressure.Moreover,the gas pressure rise was faster closer to the impact interface.Subsequently,based on engineering background,we proposed three models of stress and gas pressure distribution in the coal body ahead of the working face:static load,stress disturbance,and dynamic load conditions.Finally,the gas pressure distribution and outburst mechanism were investigated.The high concentration of gas pressure appearing at the coal body ahead of the working face was caused by the dynamic load.The gas pressure first increased gradually to a peak value and then decreased with increasing distance from the working face.The increase in gas pressure plays a major role in outburst initiation by resulting in the ability to more easily reach the critical points needed for outburst initiation.Moreover,the stronger the dynamic load,the greater the outburst initiation risk.The results of this study provide practical guidance for the early warning and prevention of coal and gas outbursts.

关 键 词：Coal and gas outburst Gas pressure Dynamic load Outburst mechanism 

分 类 号：TD713[矿业工程—矿井通风与安全]