基于CT技术的唐口煤矿大直径钻孔卸压效果研究

Research on Pressure Relief Effect of Large Diameter Drilling in Tangkou Coal Mine based on CT Technology

为分析唐口矿大直径钻孔卸压效果,采用电磁波CT技术对施工后的煤层进行探测。采用理论分析的方法对CT技术原理进行分析并建立评价模型,通过现场监测对吸收系数及其异常指数进行分析。结果表明,在孔深较浅时钻孔施工过程中的扰动效应能导致钻孔附近一定范围内裂隙的生成,这种扰动生成的裂隙具有一定的卸压效果。

In order to analyze the pressure relief effect of large-diameter boreholes in Tangkou Mine,electromagnetic wave CT technology was used to detect the coal seam after construction.The theoretical analysis method was used to analyze the principle of CT technology and establish an evaluation model.The absorption coefficient and its anomaly index were analyzed by on-site inspection.The results show that the disturbance effect during drilling operation can lead to the formation of cracks in a certain range near the borehole when the borehole is shallow,and the cracks generated by this disturbance have a certain effect of pressure relief.