高强度开采覆岩离层瓦斯通道特征及瓦斯渗流特性研究

摘要

According to the breakage and fracture developing of overlying strata, the layer with fracture diameter of more than 10-1 mm is the mining gas channels development area. Based on the theory of voussoir beam structure, the characteristic of gas channel development in the overburden under the key stratum was studied, and the identification method of the gas pattern were established for gas flow in gas channel based on Kozeny-Carman criterion. Then the overlying rock was divided into turbulent channel area, transitional circulation channel area and seepage channel area, according to the gas pattern in gas channels,and the artificial diversion method for transitional circulation channel area was set up by taking high level suction roadway as main means. Finally, the evolution law of gas channel and its influ- ence on gas guidance flow was inversed by field test at working face 80201 in Xinjing Coal Mine of Yangquan Coal In- dustry (Group) Co. ,Ltd. ,and the gas pattern was classified for transitional circulation channel area,which verified the correction and rationality of the theoretical method and the classification for mining gas channel proposed in this paper.%根据上覆煤岩层的破断和裂隙发育情况,将穿层裂隙通道直径大于10-1mm的区域定为采动瓦斯通道发育区。基于砌体梁理论,研究了关键层控制下的离层断裂带瓦斯通道的发育特征,并基于Kozeny-Carman准则建立了瓦斯通道流态的判定方法,依据其内瓦斯的流动状态将上覆岩瓦斯通道的发育沿纵向由下到上分为瓦斯紊流通道区、瓦斯过渡流通道区和瓦斯渗流通道区,并根据离层断裂带瓦斯通道的发育规律,构建了以高位瓦抽采巷为主要手段的瓦斯过渡流通道区人工导流方法。最后通过以阳泉新景煤矿80201工作面卸压瓦斯抽采现场试验,反演得到了工作面上覆岩采动瓦斯通道的演化规律及其对瓦斯导向流动规律的影响,并对瓦斯过渡流通道区内瓦斯的流态进行了判定,验证了本文提出的理论计算方法和采动瓦斯通道分区的正确性和可行性。