A method of expansion cracking and anti-permeability for rapid tunneling of underground coal seam roadway
A technology of expansion cracking and roadway, which is applied in the field of expansion cracking and anti-reflection for rapid tunneling of underground coal seam roadways. It can solve the problems of easily damaged roadway, high price, and insufficient seam width, etc., and achieve safe and reliable construction process, convenient manual operation, and improved ventilation. sexual effect
A technology of expansion cracking and roadway, which is applied in the field of expansion cracking and anti-reflection for rapid tunneling of underground coal seam roadways. It can solve the problems of easily damaged roadway, high price, and insufficient seam width, etc., and achieve safe and reliable construction process, convenient manual operation, and improved ventilation. sexual effect
CN104912588BActive Publication Date: 2017-01-25TAIYUAN UNIV OF TECH
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[0020] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:
[0021] Such as figure 1 As shown, a hole is drilled at the geometric center position of the front end 3 of the roadway 2 in the coal seam 1 and a first expansion hole 4 is constructed, a first grouting pipe 5 is inserted into the first expansion hole 4, and polyurethane 6 is used for the first expansion hole 4. The orifice of the crack hole 4 is sealed; a second expansion hole 7 is constructed directly above, directly below, directly to the left and directly to the right of the first expansion hole 4, and a second expansion hole 7 is inserted into each second expansion hole 7 respectively. A second grouting pipe 8 is used to seal the opening of each second expansion hole 7 with polyurethane 6; a third expansion hole 7 is constructed directly above and directly below the second expansion hole 7 at the same level as the first expansion hole 4. Expansion hole...
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The invention discloses a spalling permeability increasing method for rapid excavation of an underground seam gateway. The method is particularly suitable for advancing pre-pumping of a high-gas low-permeability seam gateway. A first spalling hole is constructed in the head-on geometric center position of the seam gateway, and second spalling holes are formed in the positions over, under, left and right the first spalling hole; third spalling holes are constructed in the positions over and under the second spalling holes horizontal to the first spalling hole, and exhausting and mining holes are constructed in the center points of the connecting lines of the first spalling hole and the third spalling holes; after drilling is finished, quick lime grout is injected into the third spalling holes in a crossing manner, and the spalling holes are control holes of one another; and through spalling pressure generated by the holes, net-shaped cracks are generated between the holes, so that the coal permeability is greatly improved, the gas exhausting and mining efficiency is improved, and the excavation speed of the seam gateway is improved; and the method is simple in technology, convenient to operate, wide in grout source, cheap and low in cost.
Description
technical field [0001] The invention relates to a coal seam fracturing anti-permeability method, in particular to an expansion crack anti-permeability method for rapid excavation of an underground coal seam roadway. Background technique [0002] Most coal seams in my country have the characteristics of high gas, high adsorption, and low air permeability, and with the increase of coal seam mining depth, the problem of low air permeability becomes more prominent, which brings safety hazards to coal seam roadway excavation and seriously affects the excavation speed , leading to tension in coal mining succession. At present, the pressure relief and permeability enhancement measures commonly used in high gassy and low permeability coal seams in my country include hydraulic slotting, hydraulic fracturing, and deep hole pre-splitting blasting. The method of enhanced gas extraction by hydraulic slotting is complex and difficult, the width of the slots is not enough, the resulting cr...
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Patent Timeline
25 Jan 2017
Publication
CN104912588B
- IPC
- E21F7/00; E21B33/13; E21B43/26
- Inventors
- θ‘θε; ε΄δΈζ