Method for hydraulic mining of coal beds

FIELD: mining.

SUBSTANCE: first preparatory field mines are driven - level haulage and ventilation drifts with identical geodetic elevations, block crossdrifts and accumulating drifts with an inclination for a self-flow transport, stripping wells are drilled at the right angle to the bed plane, then, line cuts are washed by the hydraulic method. Level haulage and ventilation drifts stretch at identical geodetic elevations to form a ventilation scheme with horizontal depression. The area of line cuts is increased to initiate the process of caving of a hanging massif in a stope. The stope bottom is formed by washing of line cuts with an inclination providing for accumulation of caved coal through self-flow. The caved coal is magazined to control shift of side rocks in the stope. Chambers that are adjacent to the mined space are separated by barrier sight pillars. Oversize material is crushed, and coal mass is periodically discharged in dosing manner into the accumulating drift to provide for stope bottom movement up the pitch.

EFFECT: elimination of air leaks through a mined space, reduced contamination of coal by caved rocks, higher reliability of breaking face functioning and labour safety.

2 dwg

 

The technical field

The invention relates to the mining industry and can be used for deserted dredging steep and inclined coal seams.

Prior art

The prior art method of designing cool coal seams, revealed in the author's certificate SU 823580 published 23.04.1981, which includes conducting storey drifts transport and ventilation, drilling down dip of the reservoir and the recess floor stripes on the uprising of the downhole jetting units, and storey drifts conduct the field, from the transport passage to the reservoir, in the preparation of each band performed at least two ducky that connect within the reservoir through the cavity and with the ventilation drift on the center of the strip through the rock tube to reservoir drill before meeting its end-to-end cavity, and then moves into the notch the strips. Fresh vent stream is fed to the mining area along the transport passage, outgoing goes on ventilation horizon.

The closest to the essential features of the claimed invention is a method deserted dredging thin abrupt outburst and prone to rash of coal disclosed in the author's certificate SU 1788254, which includes on the floor of the field Tran the tailor (under gravity hydrotransport) drift, drilling revealing wells and maintenance of sewage treatment works in the excavation posts remotely monitor unit with delivery of extracted coal from the face hydrotransport on the field drift, and zagadki-vruby removed to a depth equal to the width of the extraction column, and then produce a collapse of the overhanging array, control the magnitude of its exposure within the excavation area. Fresh air is fed to the mining area along the transport passage, outgoing stream is diverted to the vent horizon.

The disadvantages of this method are: air leakage through the goaf, the formation of oversized and, as a consequence, saucepan wells during collapse of the overhanging coal array and problems with the delivery of coal at him, uncontrollable nature of the rock wall rock in a mining face, the limited scope of the method - resistant rock, roof and floor.

Disclosure of inventions

The technical result, which directed the claimed invention, is the elimination of air leakage through goaf, reducing clogging of coal collapsed rocks, increasing the reliability of longwall mining and safety.

This technical result is achieved due to the fact that in the way that hydraulic dredging ug is selected layers, first conduct a preparatory field develop - storey haulage and ventilation drifts with the same geodetic marks, block crosscuts and accumulating drifts with a slope under gravity hydrotransport, Buryats opening of the bore at right angles to the plane of the pasta, then hydraulically wash slotted vruby, when this story haulage and ventilation drifts are on the same geodetic elevations for the formation of the scheme of ventilation with a horizontal depression, then increase the area of the slit cuts to initiate the process of Samoobrona overhanging array in the treatment chamber, the bottom of the treatment chamber formed by the leaching of the slot cuts slant to allow accumulation collapsed coal by gravity, then collapsed coal magazineabout to control the lateral movement of rocks in the treatment the chamber and adjacent to the goaf camera separate non-load-bearing pillars, while the oversized destroy and periodically dosed unload coal mass accumulating in the roadway to ensure prodigene slaughter camera on the uprising.

Brief description of drawings

The invention is illustrated by drawings, where:

figure 1 presents the scheme of the preparation and testing of steep and inclined coal seams;

figure 2 shows a section along a-a in figure 1.

Position 1: 1, 2 - haulage and vent the air field storey drifts; 3 is a block crosscuts; 4 - field accumulating drifts; 5 - collapsed coal in the treatment chamber; 6 - opening wells; 7 - slit shear; 9 - gutters; 10 - camera primary dewatering of coal; 11 - a collection of slurry water; 12 - loading of coal in the car or on the conveyor; 13 - placona Luggage; 14 - hole on the surface

Position figure 2: 4 - field accumulating drift; 5 - collapsed coal in the treatment chamber; 6 - opening bore; 8 - jet working body; 15 - becoming filing: 16 - machine feeder working body.

The best option of carrying out the invention

The method consists in the following. On the steep and sloping prone to spontaneous combustion of coal seams conduct preparatory field production - storey haulage 1 and vent 2 drifts with the same geodetic marks, block crosscut 3 and accumulating drifts 4 with a slope under gravity hydrotransport, Buryats opening bore 6 at right angles to the plane of the pasta. Then hydraulically wash slotted vruby 7 on the seam thickness and width of the treatment chamber before the deposition of the overhanging array magazineabout collapsed mass 5 to prevent premature collapse of the wall rock, crushed oversized high-pressure jets and dosed unload the coal mass in the well 6 on accumulating drift 4 gravity hydrotransport. P and this slot vruby 7 forming the bottom of the camera slant boards for accumulation collapsed coal by gravity. Leaching slot cuts 7 are manufactured using jetting unit with the machine feed 16, becoming the feeder 15 and the working body 8 constituting trueforms device with the possibility of swinging movement in the plane of the layer and reciprocating in his power.

The working body 8 of the unit after the collapse of the overhanging array works under the dam, there are formed high-pressure jet ranged to flush slot cuts 7 and melee for the destruction of oversized.

Washing slit cuts 7, allows to obtain an overhanging array coal, which settles (has been coming down) with increasing area exposure to values exceeding the critical value, by gradually increasing the sizes of gaps along the length (power layer) and depth, and impact on an array of jet.

The exclusion of air leakage through the mined-out area is provided through the use of schemes of ventilation with a horizontal depression between storey haulage 1 and vent 2 drifts that are with the same geodetic marks. Horizontal depression between fresh and outgoing ventilation jets unlike vertical depression between them (see prototype) blocks the leakage of air through the goaf, location is the uprising of the reservoir.

To reduce clogging of the coal rock out space adjacent working chambers separated from him enclosing the entire width of 1.3 meters Clogging of the coal in the chamber to limit the application of the method of controlling lateral strains by magazynowania coal 5 after the collapse.

Scope the method is extended to the seams with side rocks unstable and secondary stability. When unstable lateral rock excavation pillars I, II, III are processed by a single camera. To increase the load accumulating on the roadway excavation posts you can work paired and triple chambers at Bokova rocks average of sustainability and sustainable, respectively.

Improving safety ensure that all work is done only in field excavations, air leaks through the goaf blocked exhaust chambers are isolated hermetic jumpers installed in the wells 6.

Way hydraulic dredging of coal seams, characterized in that the first conducting preparatory field production - storey haulage and ventilation drifts with the same geodetic marks, block crosscuts and accumulating drifts with a slope under gravity hydrotransport, Buryats opening of the bore at right angles to the plane of the pastes is, then hydraulically wash slotted vruby, when this story haulage and ventilation drifts are on the same geodetic elevations for the formation of the scheme of ventilation with a horizontal depression, then increase the area of the slit cuts to initiate the process of Samoobrona overhanging array in the treatment chamber, the bottom of the treatment chamber formed by the leaching of the slot cuts slant to allow accumulation collapsed coal by gravity, then collapsed coal magazineabout to control the lateral movement of rocks in the treatment chamber, and adjacent to the goaf camera separate non-load-bearing pillars, while the oversized crushed and periodically dosed unload coal mass accumulating in the roadway to ensure the promotion of the bottom camera the uprising.



 

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EFFECT: higher efficiency.

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