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针对掘进工作面不同强度瓦斯爆炸传播差异性的问题.用一端开口的半封闭爆炸试验装置,通过改变瓦斯聚集长度模拟爆炸点源和线源,研究瓦斯弱爆过程中超压的变化规律.实验结果表明:半封闭受限空间内瓦斯弱爆下,爆炸超压在燃烧区呈非线性变化,先上升后下降,并随传播距离增加而逐步衰减直至消失.爆炸实验结果与借助爆炸力学理论构建的弱爆理论模型相比,冲击波在一般空气区内的传播变化趋势与理论解吻合,理论模型不适用于瓦斯燃烧区.研究结果为防治瓦斯爆炸及事故勘验提供了技术和理论支持.
Aiming at the difference of gas explosion propagation with different intensities in driving face, the open source and semi-enclosed explosion test device was used to simulate the explosion source and source by changing the gas accumulation length to study the variation law of overpressure during the weak gas explosion.Experimental results It shows that the explosion overpressure changes non-linearly in the combustion zone under semi-confined confined space, and then increases and then decreases, and gradually decays with the propagation distance until it disappears.The results of the explosion experiment are compared with those obtained by using the theory of explosive mechanics Compared with the weak explosion theory model, the propagation trend of the shock wave in the general air region agrees well with the theoretical solution, and the theoretical model is not suitable for the gas combustion zone.The results provide technical and theoretical support for the prevention and control of gas explosion and accident investigation.