A kind of lump coal mining adopts advanced pre-splitting method
A pre-splitting and advanced technology, applied in the fields of fluid extraction, ground mining, earthwork drilling, etc., can solve the problems of high input cost, poor use effect and unsafety, and achieve low input cost, better effect and safe mining process. Effect
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[0034] Such as figure 1 The block coal mining shown adopts the advanced pre-cracking method, and adopts the method of combining carbon dioxide pre-cracking and hydraulic fracturing to work on the coal seam to be mined in multiple segments along the advancing direction of the coal seam working face. The advanced pre-splitting of the surface; the advanced pre-splitting methods of a plurality of the segments are all the same; wherein, when any segment is carried out to the advanced pre-splitting, the process is as follows:
[0035] Step 1, drilling: drill a pre-splitting borehole on the current pre-splitting section, the number of the pre-splitting boreholes is one or more; the drilling direction of the pre-splitting borehole is consistent with the current coal mining face Arranged in parallel and / or vertically; the length of the pre-splitting borehole is 50m-150m. The current pre-splitting segment is located 50m to 150m in front of the current coal mining face.
[0036] Wherei...
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