Experimental study on the influence of roadway shape on the evolution of outburst fluid static pressure  

作　　者：Jiang Xu Xiaomei Wang Liang Cheng Shoujian Peng Hailin Yang Bin Zhou Feng Jiao 

机构地区：[1]State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400030,China [2]College of Safety Science and Engineering,Xian University of Science and Technology,Xian 710054,Shaanxi,China

出　　处：《International Journal of Coal Science & Technology》2024年第4期274-289,共16页国际煤炭科学技术学报(英文)

基　　金：supported by the National Natural Science Foundation of China(51874055,52074047).

摘　　要：To explore the static pressure dynamic disaster mechanism of coal-and-gas outburst(CGO)fluid,the self-developed multifield coupling large-scale physical simulation test system of coal mine dynamic disaster was used to carry out gas outburst and CGO physical simulation tests in straight,L-shaped and T-shaped roadways.The influence of roadway shape on the evolution of static pressure was explored,and the role of pulverized coal in the process of static pressure dynamic disaster was clarified.The results indicated that the static pressure showed a fluctuating downward trend during the outburst process.When gas outburst,the middle and front parts of the roadway in the straight section roadway were the most serious areas of static pressure disasters in the three shapes of roadways.The duration and range of high static pressure disaster in L-shaped roadway were larger than those in T-shaped and straight roadways in turn.When CGO,the most serious area of static pressure disaster in L-shaped and T-shaped roadways moved backward to the middle of the straight section roadway,and there was a rebound phenomenon in the process of static pressure fluctuation decline,which showed the pulse characteristics of CGO.During the outburst,the static pressure dynamic disaster hazard of L-shaped roadway was higher than that of T-shaped roadway,and the static pressure at the bifurcation structure decayed faster than that at the turning structure,which indicated that T-shaped roadway was more conducive to the release of static pressure in roadway,thus reduced the risk of static pressure disaster.When gas outburst,the static pressure attenuation of the fuid in the roadway before and after the turning and bifurcation structure was greater than that of CGO.The peak static pressure and impulse of the fluid during gas outburst were 2 times and 4-5 times that of CGO respectively.The presence of pulverized coal reduced the attenuation of static pressure and the hazard of dynamic disaster,prolonged the release time of energy,and led to the change

关 键 词：Gas outburst Coal-and-gas outburst.Static pressure Roadway shape Dynamic disaster.Outburst fluid 

分 类 号：TD3[矿业工程—矿井建设]