煤层瓦斯卸压抽放动态过程的气-固耦合模型研究

根据瓦斯渗流与煤体变形的基本理论,引入煤体孔隙变形与透气性演化的耦合作用方程,建立了考虑煤层吸附、解吸作用的含瓦斯煤岩固-气耦合作用模型。应用该模型模拟研究了不同压力影响下瓦斯抽放过程中煤层透气性的演化和抽放孔周围瓦斯压力的变化规律,其结果对于深入理解瓦斯抽放作用机制并采取相应的瓦斯预防和控制措施等具有重要的理论和实践意义。

Coupled model of gas-solid in coal seams based on dynamic process of pressure relief and gas drainage

On the basis of seepage theory of gas flow in coal seams, elastic theory of coal deformation, together with the coupling relationship between gas permeability and porosity, a mathematical model for coupled gas-solid in coal collieries is established. By using the gas-solid coupled model, the mining induced pressure relief, the gas pressure changes, gas drainage and the associated characteristics of gas permeability and gas pressure in coal seam during mining were numerically simulated. The numerical simulation is helpful for understanding the gas drainage mechanisms and for taking effective measures to prevent the occurrences of gas outbursts in collieries.