巷道截面变化对突出冲击波传播的影响

为了分析巷道截面积变化对煤与瓦斯突出冲击波传播的影响，首先利用流体力学、空气动力学理论建立了突出冲击波在变截面巷道中传播的数学模型，理论分析得出了冲击波衰减与截面积变化率之间的变化规律；其次构建了变截面巷道冲击波传播的实验系统，研究了冲击波在变截面巷道中传播规律，实验研究表明突出冲击波由大截面巷道传到小截面巷道时，冲击波超压变大，波阵面的单位能量是增大的；然后建立了冲击波在变截面巷道中传播的数值计算模型，数值计算结果表明冲击波初始超压越大，冲击波衰减越快，且巷道截面积变化率越大，冲击波衰减系数也越大；最后通过对比分析，表明理论分析、实验研究以及数值计算的结果是一致的。

Influences of roadway cross-section variation on outburst shock wave propagation

In order to analyze shock wave propagation of coal and gas outburst induced by roadway cross-section variation,firstly,mathematic model of outburst shock wave propagation in variation cross-section roadway was established by fluid dynamics and air dynamics,the variation law between shock wave propagation and cross-section variation rate were obtained by theory analysis.Secondly,the experimental system for shock wave propagates in variation cross-section roadway was constructed,and the shock wave propagation law was revealed.The experimental results indicate that overpressure becomes larger and the energy per area of the wavefront is increased when shock wave propagates form large cross-section to small one.Then numerical simulation model of shock wave propagate in variation cross-section was established,the simulation results show that the greater the initial shock wave overpressure is,the faster the shock wave decay,and the larger the roadway cross-section variation rate is,the greater the shock wave attenuation coefficient is.Finally,comparative analysis shows that the theoretical analysis,experimental research and numerical results are consistent.