Air leakage caused by mining-induced fractures around the borehole and roadway greatly affects the effect of underground gas drainage. Therefore, the study of the air leakage model considering three-dimensional stress and coal elastic-plastic deformation is of great significance to prevent air leakage. In this work, a model of air leakage outside borehole in mining-disturbed coal seam including a fully coupled gas-air flow and coal mechanics model and a mining-induced damage permeability model was developed and verified. The model was used to study the gas-air migration law and air leakage mechanism during gas drainage, and the influence of key parameters including initial permeability and sealing depth on gas drainage effect was analyzed. The results show: (1) The model can be used to characterize the air leakage of pre-drainage boreholes in mining-disturbed coal seams. (2) The gas and air pressure in the severe mining disturbance area rapidly decreased and increased in a short time. (3) Increasing the initial permeability and sealing depth will promote the gas flow in the borehole in the early stage, but the gas concentration will be reduced. The research results provide a scientific theoretical basis for improving the gas drainage effect and ensuring mining safety.

井眼、巷道周围开采裂缝引起的漏风对地下瓦斯抽采效果有很大影响。因此，研究考虑三维应力和煤弹塑性变形的漏风模型对于防止漏风具有重要意义。在这项工作中，开发并验证了采矿扰动煤层钻孔外漏气模型，包括完全耦合的气流和煤力学模型以及采矿引起的损伤渗透模型。利用该模型研究瓦斯抽采过程中的气气运移规律和漏气机理，分析了初始渗透率、封堵深度等关键参数对瓦斯抽采效果的影响。结果显示：(1) 该模型可用于表征扰动煤层预抽钻孔的漏风特征。(2)严重矿扰区瓦斯气压在短时间内迅速下降和上升。(3) 增加初始渗透率和封堵深度会促进早期井内气体流动，但会降低气体浓度。研究成果为提高瓦斯抽采效果、保障开采安全提供了科学的理论依据。