煤与瓦斯突出冲击波传播规律研究  

Research on the propagation of shock waves from coal and gas outburst

作　　者：吴爱军[1,2] 蒋承林[1] 

机构地区：[1]中国矿业大学安全工程学院,江苏徐州221116 [2]西南科技大学环境与资源学院,四川绵阳621010

出　　处：《中国矿业大学学报》2011年第6期852-857,共6页Journal of China University of Mining & Technology

基　　金：国家重点基础研究发展计划(973)项目(2006CB202204-3)

摘　　要：应用应力波理论研究了煤与瓦斯突出过程中产生的冲击波在煤体界面上的反射、透射现象,得到了入射、反射和透射超压解析解,根据空气动力学分析了冲击波沿巷道方向传播规律.结果表明:透射超压值为入射超压的两倍,而反射超压值略小于入射超压.冲击波超压与冲击气流、突出的膨胀能量成正比,与通风巷道的截面面积呈反比;当冲击波在单个层状煤体中传播时,它会在其两端自由界面上出现反射,反射波反向卸载,自由面上物体振动速度加倍,又将其撕裂成若干个更薄的层状体;当冲击波传播到构造煤和硬煤岩体的分界面上时,产生了强烈的透射和反射现象,透射波在分界面上叠加,其应力值加倍,煤体受到强烈压缩作用,当其超过软煤强度时,软煤被压裂破坏.The reflection and propagation of a shock wave during coal and gas outburst were studied.Stress wave theory was used to estimate wave behavior at the coal interface.An analytical solution for the incident,reflected,and propagated waves has been obtained.Shock wave propagation along a tunnel has been examined using aerodynamic theory.The results show that transmission overpressure is twice the incident overpressure.However,the reflected overpressure is slightly less than the incident overpressure.The impact from blast pressure is proportional to the flow and expansion of energy in the wave and inversely proportional to the area of the ventilation tunnel.A shock wave propagated through a single coal layer is reflected at the free interface at both ends.As the reflection reverses there is an unloading causing the velocity at the free surface to double.This tears the coal into several thinner laminas.A shock wave propagating through an assembled structure of tectonic coal and hard coal rock creates strong propagation and reflection transients at the interface,where the transmitted waves superpose and the stress value doubles.The coal is then fractured and damaged by compression stresses that exceed the yield limit of the soft coal.

关 键 词：突出 冲击波 透射 反射 超压 

分 类 号：TD713.2[矿业工程—矿井通风与安全]