The present application relates to the technical field of
tunnel construction, in particular to a small-angle roof
coal uncovering tunnel vault small-section
coal uncovering process, comprising S1, excavating a ladder-type drilling field; S2, drilling and pumping a drainage hole; S3, setting up an extraction
system; S4, performing extraction operation. The ladder-type drilling field is excavated in a limited ladder form in accordance with the overall trend of the
bedding, and the drainage hole is drilled in a manner perpendicular to the step drilling surface, which can realize uniform distribution of drilling holes in the target area through drilling hole channels with approximately the same length. Since the direction of the drilling hole channel is determined, the drilling angle and depth can be quickly determined, the distance to the
bedding surface can be easily predicted, the drilling speed and pressure of the drilling
machine can be dynamically adjusted in advance, the construction safety is improved, the
construction engineering quantity is reduced, the construction efficiency is improved, the hole
completion rate is improved, and at the same time, the drilling hole channel can form a small-angle intersection with the
bedding surface, so that the drainage hole can effectively contact more gas-containing bedding fissures, improve the coverage of the bedding surface area, and be beneficial to improving the mining efficiency.