为了更好的研究瓦斯立体抽采条件下的采空区的瓦斯流动和涌出规律,根据“砌体梁”的顶板下沉移动曲线和导气裂隙带的“O”型圈理论,研究煤矿井下采空区破碎煤岩的渗流特性,对垮落带破碎煤岩的渗透率进行量化研究,推导出正常回采期间采空区垮落带的渗透率半理论化的表达式,并将其应用于阳泉三矿K8206综采工作面的U+I型+高抽巷的瓦斯立体抽采系统中,根据现场情况建立对应的CFD模型,得出瓦斯立体抽采条件下采空区瓦斯流动及分布规律,数值模拟结果和现场大量观测数据高度吻合,为瓦斯抽采系统的设计和优化提供理论依据. In order to better study the gas flow and gushing law in goaf under gas drainage condition, according to the roof subsidence movement curve of “Masonry beam” and “O” ring of gas-bearing fracture zone Theory to study the seepage characteristics of broken coal and rock in the mined-out area of ​​coal mine and quantitatively study the permeability of the broken coal and rock in the caving zone. The semi-theoretical expression of the permeability of the caving zone in goaf during normal mining is derived, And apply it to the gas drainage system of U + I + high pumping lane of K8206 fully mechanized coal mining face of Yangquan No.3 Mine. The CFD model is established according to the site conditions, and the mined area Gas flow and distribution law, the numerical simulation results are in good agreement with a large number of on-site observation data to provide a theoretical basis for the design and optimization of gas drainage system.