On the advantages and disadvantages and adaptation conditions of the arrangement of through-layer holes

The advantage is simple operation, but the disadvantage is poor sealing and strong adaptability to coal seams in a certain range.

Its advantages are simple operation and beautiful appearance. The disadvantage is to drill through the layer with poor sealing, and the advantage is that the drainage time is long and the drilling construction is difficult. After the gas drainage in the area near the transportation roadway in the working face, the gas emission during tunneling is reduced. The adaptation condition is that the whole mining block in the section, the mining roadways on both sides and the coal seams in a certain range outside the section should be controlled to prevent the outburst of coal seam gas area when drilling through layers or along layers.

Cross-layer drilling refers to drilling against the strike or inclination of coal seam, which means drilling through coal seam at the initial drilling position and reaching other coal seams or strata.