Technical Center, Shanxi Coking Coal Xishan Coal Electricity (Group) Co., Ltd.

针对马兰矿10604工作面回采时产生大量煤尘的问题,通过利用COMSOLMultiphysics数值模拟软件对不同钻孔注水参数如注水压力和注水钻孔直径下的煤层注水效果进行数值模拟并进行分析优化的方法,提出一套适用于工作面的最佳注水技术方案,用来显著降低该工作面的产尘量。相关研究结果表明:随着注水时间的延长,注水效果增强,在30h左右达到饱和状态;随着钻孔直径的增加,注水效果也在增强,由d=0.05m时注水有效湿润半径的1.52m提高至d=0.2m的2.78m,但考虑钻孔直径过大会导致塌孔,选择了直径d=0.06m;随着注水压力增加,注水效果也在增强,由注水压力P=6MPa时的注水有效湿润半径1.33m提高至P=12MPa的2.95m,结合现场的条件最终选择注水压力P=12.5MPa。最后经过现场应用后对模拟结果的准确性进行了验证。

In response to the problem of generating a large amount of coal dust during the stoping of the 10604 working face in Malan Mine, through using the method of COMSOL Multiphysics numerical simulation software, the coal seam water injection effects under different borehole water injection parameters such as water injection pressure and water injection borehole diameter are numerically simulated and analyzed and optimized. A set of optimal water injection technology schemes suitable for the working face is proposed to significantly reduce the dust production quantity of this working face. The relevant research results indicate that with the extension of water injection time, the water injection effect enhances and reaches saturation state at around 30 hours; With the increase of borehole diameter, the water injection effect is also enhanced, from 1.52 m of effective wetting radius when d=0.05 m to 2.78 m when d=0.2 m. However, considering that hole collapse may be caused when the borehole diameter is too large, a diameter of d=0.06 m is chosen; With the increase of water injection pressure, the water injection effect is also enhanced. The effective wetting radius of water injection at P=6 MPa increases from 1.33 m to 2.95 m at P=12 MPa. Combined with the on-site conditions, the water injection pressure P=12.5 MPa is ultimately selected. Finally, the accuracy of the simulation results is verified through on-site application.