突出煤层钻孔有效抽采半径测定新方法

 为了提高钻孔有效抽采半径的计算速度和精度，以卧龙湖煤矿7煤为研究对象，总结了现有瓦斯抽采有效半径测定方法，分析了瓦斯流动是应力场、变形场和瓦斯流动场间的动态气固耦合过程，提出了采用COMSOL模拟软件计算抽采有效半径的方法。基于达西定律，建立了瓦斯流动方程，设定了应力位移和瓦斯流动边界条件。将现场测定的瓦斯压力、瓦斯含量、瓦斯流量、透气性系数和抽采负压等瓦斯参数带入计算模型进行数值计算。结果表明：该方法相对于传统方法快捷简便，计算周期短

New Method to Measure Effective Gas Drainage Radius of Borehole in Outburst Seam

In order to improve the calculation speed and accuracy of the borehole effective gas drainage radius,taking No.7 seam of Wolonghu Mine as the study object,the paper had analysis on the gas flow of the dynamic air and solid coupling process between the stress filed,deformation field and gas flow field.The paper provided the method of the COMSOL simulation software applied to calculate the effective drainage radius.Base on the Darcy′s law,a gas flow equation was established and the stress displacement and gas flow boundary conditions were set up.The calculation model was considered the site measured gas pressure,gas content,gas flow,permeability coefficient,gas drainage negative pressure and other gas parameters for the numerical calculation.The results showed that the method would be fast and convenient in comparison with the conventional method and the calculation period would be short.