瓦斯压力对煤与瓦斯突出冲击波传播的影响研究

为研究瓦斯压力对煤与瓦斯突出冲击波传播的影响,自主研制了一套突出煤—瓦斯两相流模拟实验系统,开展了不同瓦斯压力条件下的煤—瓦斯两相流运移规律模拟实验,实现了对突出过程巷道内突出煤—瓦斯两相流运移的可视化监测.实验结果表明:煤与瓦斯突出是一个从突出口开始迅速向煤体内部发展的动力过程,期间瓦斯压力存在多次上下波动;突出过程...

Study on the influence of gas pressure on the propagation of coal and gas outburst shock wave

In order to study the influence of gas pressure on the propagation of coal and gas outburst shock wave,a set of coal-gas two-phase flow simulation experimental system was developed independently.The simulation experiments of coal-gas two-phase migration law under different gas pressure conditions were carried out,and the visual monitoring of coal-gas two-phase migration in the roadway during the outburst process was realized.The experimental results show that the coal and gas outburst is a dynamic process from the outburst to the interior of the coal mass,the gas pressure fluctuates up and down for many times during the period;during the outburst process,the overpressure of the shock wave in the roadway presents a pattern of alternating change positive pressure and negative pressure,and the characteristic value of shock wave overpressure increases with the increase of the initial gas pressure in a logarithmic function;the propagation of shock wave overpressure in the roadway is a process of constant attenuation.The attenuation is slow in the early stage and accelerates in the later stage.