煤与瓦斯突出后灾害气体影响范围试验研究

为确定煤与瓦斯突出事故发生后处于爆炸极限内的瓦斯分布区域,避免在此区域布置机电设备,降低突出后发生瓦斯爆炸的危险性,根据矿井的实际参数,设计相似模拟试验,建立在巷道风流作用下的突出气体运移扩散模型,并结合实际煤与瓦斯突出强度和通风条件,分析了突出后高浓度瓦斯的时空分布规律。研究结果表明:各测点监测的气体量与监测距离呈负指数关系,紊流扩散系数与实测值基本一致,灾害气体到达各测点的初至时间和监测距离均呈现良好的线性关系;风量为648 m3/min,断面面积为9 m2条件下,突出10 000 m3瓦斯后,距离突出源563 m以内的巷道区域为瓦斯爆炸危险区域,0~290 s内发生瓦斯爆炸危险性最大,而在距离突出源563 m以外的区域布置机电设备,巷道发生瓦斯爆炸的危险性较小。

Experimental research of influence scope of disaster gas after coal and gas outburst

To determine distribution area of gas which lies in explosion limits and avoid electromechanical equipment’s arranging in the area can reduce the risk of gas explosion after coal and gas outburst accident，based on actual parameters of mine，similar simulation test was designed and the model of migration and diffusion of gas along with air flow after outburst was put forward.Combining with the actual strength of coal and gas outburst and atmospheric conditions，space- time distribution of high concentration gas after coal and gas outburst was analyzed.The results show that the gas amount of each monitoring point has a negative exponent relation with monitoring distance.Turbulent diffusion coefficient is identical with the actually measured value.The first break time at which disaster gas reaches each monitoring point has good linear relationship with each monitoring distance.Under the air volume of 648 m3/min and sectional area of 9 m2，gas explosion more likely occurs in the area within 563 m from outburst source and during the time of 0-290 s after 10 000 m3 gas extrudes.The occurrence probability of gas explosion is small when electromechanical equipments arrange beyond 563 m from outburst source.