The invention relates to the technical field of
coal mining, in particular to a jet fracturing method for improving the
coal caving rate of a hard and thick top
coal fully mechanized caving face, which comprises the following steps: constructing a first directional long
drill hole in top coal; a plurality of second directional long
drill holes are constructed in the top plate, and the drilling direction of the second directional long
drill holes is perpendicular to the working face; based on the multiple second directional long drill holes, the top plate is subjected to jet fracturing; a rock block is formed on the top plate and acts on the top coal; and fracturing the top coal based on the first directional long
drill hole. The method comprises the following steps: constructing a first directional long
drill hole in top coal; a plurality of second directional long drill holes are constructed in the top plate, advanced drill holes are not affected by
stoping, and crack expansion is more sufficient; based on the multiple second directional long drill holes, the top plate is subjected to jet fracturing; the rock block acts on the top coal, so that the weighting step
pitch can be reduced, and the rock is broken and rotated in time and acts on the coal body; based on the first directional long
drill hole, the top coal is fractured, and the density and complexity of the hydraulic fracture of the coal hole can be increased.