SU1500789A1 - Method of protecting coal seam against gas-dynamic manifestations - Google Patents

Description

The invention relates to the mining industry and m. used in the development of outburst and shock seams. The purpose of the invention is to expand the boundaries of the coal seam protection by increasing the range

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protective action. Prior to commencing work on the outburst and protective layer (RFP) in inter-area rocks along the line of the working face of the protective lava, artificial pillars (IC) are formed with a width less than the width of the reference pressure zone, but more than or equal to 0.3 of this width. The height of the IC along the normal to the bedding is defined as the difference between the power of the interplast in the roof or soil of the RFP and the range of the protective action. After the formation of the IC, mining of protective lava and prepared excavations at the outburst-hazardous formation are carried out. For the formation of IC from the preparatory workings, drill holes to the height of the pillars, charge them, torpedo and crush the rocks within the height of the pillars. Then, hardening cement mortars of high Stability are injected into the explosion zone.

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The invention relates to the mining industry and can be used in the development of outburst and hazardous coal seams.

The purpose of the invention is to expand the boundaries of the coal seam protection by increasing the range of protective action.

The drawing shows a diagram of the complete method.

The diagram shows the protective layer 1, protected layer 2 dangerous for gas-dynamic phenomena, reservoir preparatory workings 3 on the protected layer, protective lava 4, field workings 5 ahead of protective lava, well 6, height 7 of the rear sight, repeated wells 8.

The method is as follows.

Prior to commencing work on layers 1 and 2 in rocks of interdiscipline of formation 1, artificial pillars along the line of protective lava 4 are formed, while the width of the pillars b is equal to 1> Н ^ -0.31, where 1 is the width of the reference pressure zone, the height of the pillars H normal to the formation

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with

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from dependence Н = Н < ₂ - 8 _Ϊ2 , where

L _L2 - interplast power in the roof or soil of the protective layer; 8, _{) 2} range of protective action. After the formation of artificial pillars, the protective lava 4 is worked out, and then the preparatory excavations 3 on the formation 2.

For the formation of artificial pillars from preparatory workings 5 (reservoir, field) in front of the working face of protective lava 4 or from other convenient workings, boreholes 6 are drilled to a height of 7 pillars, they make them, torpedo and crush the rocks within the height of the pillars. Loosening of rocks may be carried out in other ways - hydraulic fracturing, geotechnological methods. Then, from the workings 5, wells 8 are re-conducted and through them into the loosened massif into the roof, the soil, the marginal part of the reservoir outside the lava contour under pressure P> y-H, 25 hardening cementing solutions of high stability (urea resins, liquid glass, expanding concrete).

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Claims (3)

Claim 1. The way to protect the coal seam the face of a protective seam of artificial pillars with a width less than the width of the reference pressure zone that is ahead of a hazardous seamy undermining with a protective seam, characterized in that, in order to expand the boundaries of the coal seam protection by increasing the protective action range, the formation of artificial pillars is produced in the interfacial rocks before the clearing in the protective seam begins width 1> E 0.31, where 1 is the width of the reference pressure zone, and height normal to the bedding, equal to Η = - 5 _{) g} , where is the power of the interplast in the roof or soil of the protective layer; 3 ί.2. ~ range of protective action. 2. The method according to claim 1, characterized in that the pillars are formed by drilling from preparatory workings of the wells and blasting explosives in them in torpedoing mode with subsequent injection of hardening cementing solutions into the explosion zone. 3. The way pop. 1, distinguished by the fact that the pillars form