密闭空间瓦斯爆炸多场演化特点模拟研究

目前对井下巷道瓦斯爆炸的模拟研究较多,但大部分研究存在缺少参考井下巷道具体参数依据的问题。为了更加准确地分析瓦斯爆炸冲击波的流场演化特征,以湖南省醴陵市马劲坳煤矿为研究对象,采用数值模拟软件对该煤矿井下巷道发生瓦斯爆炸时的温度场、应力场、冲击波传播规律及速度场的变化规律进行了较详细的分析,结合理论研究对模拟结果进行了较完善的阐述;同时研究了爆炸过程中产生的温度及超压载荷随时间变化的规律,得出温度及超压载荷变化的一般性规律公式;对瓦斯爆炸中巷道的开口端和封闭端的气体冲击波速度差异进行了重点研究,分析了高速流动气体传播过程及波动形式,得出气体和压力的不稳定状态是重要影响因素。研究结果表明:通过参考实际地质资料的模拟研究,得出急剧上升的温度和超压现象是破坏井下安全设施的主要因素,这为井下瓦斯爆炸防治提供重要研究基础。

Simulation study on multi-field evolution characteristics of gas explosion in confined space

Aiming at present, there are many simulation studies on gas explosions in underground tunnels, but most of them lack the basis for referring to the specific parameters of underground tunnels. In order to more accurately analyze the characteristics of the flow field evolution of the gas explosion shock wave, taking the Majin"ao Coal Mine in Liling City, Hunan Province as the research object, the numerical simulation software was used to simulate the temperature field, stress field and shock wave propagation law of the gas mine underground tunnel. The variation law of the velocity field is analyzed in more detail, and the simulation results are explained in conjunction with theoretical research. At the same time, the law of temperature and overpressure load generated during the explosion process with time is studied. General law formula for compressive load changes. This paper refers to the simulation study of actual geological data to provide feasibility suggestions for the prevention and control of underground gas explosion.