瓦斯煤尘爆炸巷道反射压力研究

Study on reflected pressure of gas and coal dust explosion in tunnel

为揭示瓦斯和瓦斯煤尘爆炸反射压力沿矿井巷道传播变化的规律，用管道爆炸实验系统模拟测试极弱爆炸和极强爆炸巷道超压与反射压力的定量变化关系．结果表明，瓦斯和瓦斯煤尘与空气混合爆炸，在弱爆炸条件下爆炸的反射压力均是峰值超压的1．8～2．0倍，强爆炸下瓦斯或瓦斯煤尘爆炸的反射压力大约是峰值超压的8～21倍．实验结果与理论计算基本吻合，表明巷道反射压力强度取决于冲击波在巷道空间内的反射过程，巷道内爆炸超压强度随爆炸传播距离的增加而降低，遇固壁则反射压力强度加大，加重了井下设备的破坏和人员伤害程度．

In order to reveal the gas,gas and coal dust explosion reflected pressure changes along with the spread of mine tunnel, relationship between quantitative changes of explosion overpressure and reflected pressure is tested with the pipe explosion experiment system. The results show that in the gas and coal dust and gas mixed with air explosion,reflected pressure explosion in the weak condi-tion is 1. 8～2. 0 times of peak overpressure,in strong explosion the reflected pressure of gas or gas and coal dust explosion is about 8～21 times of peak overpressure. The experimental results were in accordance with the theoretical calculation,showing that the reflec-ted pressure intensity depends on the reflection of shock wave in the process of roadway space. The explosion overpressure strength in-creases as the distance from the explosion propagation decreases in the tunnel,but before solid wall the reflection intensity of pressure will increase,which aggravates the equipment damage and human injuries.