瓦斯压力对超前钻孔有效排放半径影响数值模拟研究

Study on Numerical Simulation of Gas Pressure Effect on Effective Discharge Radius of Advanced Drilling

依据煤层瓦斯压力对瓦斯流动影响规律,应用数值模拟软件FLUENT建立煤层瓦斯压力对超前钻孔影响的数值模型,模拟分析了煤层瓦斯压力分别为0.85、0.95、1.05 MPa,超前钻孔排放直径为110 mm,煤层渗透率为4.0×10-14 m2条件下瓦斯压力对超前钻孔有效排放半径的影响。

Built the model of gas pressure effect on discharge radius of advanced drilling on the basis of analysis of gas flow laws in coal mine, and used fluid dynamics software FLUENT to simulated them on the condition of three kinds of coal seam gas pressure, respectively was 0.85、0.95、1.05 MPa,drilling diameter was 110 mm, permeability of coal seam were 4.0×10-14m2.