SU1254157A1 - Method of working steep thick coal seams - Google Patents

Description

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The invention relates to the mining industry and can be used in the underground development of powerful steep coal seams.

The purpose of the invention is to provide coal seams with variable power and reduce carbon clogging with the material filling the developed space.

Figure 1 presents the method of developing a powerful steep coal seams of variable power, a general view; figure 2 - section aa in fig „1; Fig.3 section BB in Fig.1; FIG. 4 shows the staging of coal extraction under the overlap blocks (versions q and S), in places where the formation thickness decreases; Fig. 5 shows the same in areas where the reservoir thickness is close to the limiting overlap for a given frame size.

The method is carried out in a consistent manner.

The section of the reservoir opened by the industrial elevations is prepared by conducting reservoir openings: flank formations, pulp-bypass furnace. On the ventilation horizon, diagonally cut blocks of overlap t are mounted with a sliding connection and a melada is mounted on them. On top of the overlapping blocks are laid down with an overlap disconnector 2. The coal is removed in layers in descending order by means of hydromechanical equipment under the protection of overlap I blocks. soil sl.o, or directly on the soil of the layer.

Excavation of coal in the layer is carried out in several steps (stages). In the first place, the reception of the coal is carried out under the semi-blocks of 3 hangs, of which the sides of the formation in the direction from the pulpuskny furnace to the grains

of the excavation floor (stage I, fig. 4 and 5), then in a receding order under the semi-blocks 4 of the recumbent layer in one (stage II, fig, 4o, Za) or several (stage 11, u, IV, fig. 4 5, 55) stages. In one or several stages of excavation, coal is made by planting the semi-blocks 4 of the recumbent side on the soil of the next layer. Simultaneously with the movement of the semi-blocks 4 of the recumbent side along the dip, the spontaneous displacement along the dip of the formation of the half-blocks 3 hangs on the side of the formation along the inclined mutual slip plane of the semi-blocks 3 and 4. Increasing and decreasing the thickness of the formation is possible within certain limits for one or another overlap size.

The limits of the permissible fluctuations of the reservoir thickness are determined by calculation from the conditions that the centers of the heavy weight of the semi-blocks 3 hangs on the sides should not extend beyond the inclined tails of the half-bridges 4 of the recumbent side of the reservoir (limitation on the maximum reservoir thickness) be no less than the width of the upper flange of the half block 3 of the sides of the reservoir (limiting shnimalnoe thickness of the reservoir), while the angle of inclination of the plane of mutual slip of the half blocks 3 and 4 overlap is determined from

 H,

where oL is the dip angle;

f is the angle of inclination of the plane of mutual sliding of the half-blocks of the overlap to the horizontal plane ;.

H - friction angle for material overlap.

FIG. 9

Editor K. Voloshchuk

Compiled by B. Cherkashenin

Tehred M. Morgental Proofreader L. Patay

Order 4698/36 Circulation 470Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab ,, d, 4/5

Production and printing company, Uzhgorod, st. Project, 4

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Claims (1)

METHOD FOR THE DEVELOPMENT OF POWERFUL STEEP COAL COAL STRESSES, including preparatory workings, installation of floor blocks with a sliding connection between them on the ventilation horizon, a descending cleaning layer excavation of reserves of the required capacity and reduction of coal clogging with the material filling the mine. secret space, overlap blocks are formed from semiblocks respectively in the hanging and lying sides of the formation with an inclined plane of sliding between them, while flexible overlap is mounted on top of the semiblocks, after which coal is first excavated under the half-block of the hanging side to the boundary of the excavation section, and then into in a descending order, coal is excavated under the half-block of the lying side, and when installing the half-block of the hanging side, its upper shelf is formed with a width less than the minimum horizontal thickness of the formation, and the slip planes between the semiblocks are formed at an angle determined by the ratio of the angle of incidence of the formation; the angle of inclination of the slip plane between the semiblocks; SU ,, 1254157 where οί - walkers by means of hydromechanization under the protection of floor blocks, landing of floor blocks on the soil of the spent layer by vibration exposure to them, distinguishes