Pressure-relieving and permeability-increasing method for drilling exploitation of ultra-thin coal seam
A very thin coal seam drilling and mining technology, which is applied in earthwork drilling, ground mining, underground mining, etc., can solve the problems of increasing the risk of gas outburst or water inrush, reducing the profit margin of coal mining, and increasing mining costs, etc. The effect of coal recovery rate, reduction of mining cost, and reduction of the number of operators
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[0029] The present invention will be further described below in conjunction with the accompanying drawings:
[0030] The invention is a method for drilling and mining pressure relief and permeation enhancement in extremely thin coal seams, and the technological process is as follows: figure 1 shown, the specific steps are as follows:
[0031] (1) According to the geological conditions of coal seam mining, in the coal seam group, select an extremely thin coal seam with low gas content and pressure as the first coal seam N for drilling.
[0032] (2) Collect the geological data of the first mining protective layer, design the drilling height and select the model of the auger shearer according to the occurrence change of the coal seam thickness and the drilling distance.
[0033] (3) Drilling parameters such as figure 2 shown:
[0034] Drilling width a:
[0035]
[0036] In the formula: w, the drilling width of the auger 1 once; E, the elastic modulus of the roof; H, the t...
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