SU1659657A1 - Method of mining thick steep and sloping coal seams - Google Patents

Abstract

The invention relates to the underground mining of coal deposits by hydraulic means. The goal is to reduce the loss of coal and move it with collapsed rocks by directionally moving the flexible slab from the sub-floor to the sub-floor. The seams are worked by subsurfaces under collapsed rocks. Layered workings are made in the sub-floors and the excavation of the installation layer is carried out. The invention relates to the mining industry and can be used in the development of thick steep and inclined seams during coal hydraulic excavation. The purpose of the invention is to reduce the loss of coal and mixing it with collapsed rocks by directionally moving the flexible slab from the sub-floor to the sub-floor. FIG. 1 shows a diagram of the preparation of the reservoir sub-floors; in fig. 2 shows section A-A in FIG. one; in fig. 3 is a diagram of the excavation of the ceiling by converging in and the movement of the end rope near the soil of the formation; on which is mounted a flexible metal overlap with the ends along the side rocks. The development of the reserves of the substage is carried out from the layered workings by hydrotreatment in turn behind the flexible overlap. The removal of each entry is carried out in two stages. At first, the cutting layer is removed to the step of the workpiece by opposing strikes from the side of the soil and the roof of the formation. Then work out stocks above the slash layer. The ends of the flexible overlap are moved one step along the lateral rocks along the lateral rocks first at the soil, and therefore the roof of the stratum is dredged at an acute angle of the stitch first from the soil of the stratum and then expanding at the same angle from the roof of the stratum. After this, a flexible overlap is planted from the subsurface being worked out in the subsurface to be tested in the direction from the soil to the top of the formation. The angle of converging and expanding approaches is determined by the ratio of the width of the approach to the horizontal thickness of the formation. Subsequent subfloors work out similarly. 1 hp (-y, 5, ill. Fig. 4 is a schematic diagram of the excavation of the ceiling with expanding stoppers and movement of the end rope at the roof of the reservoir; fig. 5 - successive phases of the substage testing at the roof of the reservoir. The method is carried out as follows: At the roof 1 and the soil 2 layers, layered drifts 3 and 4 are placed. A horizontal subsurface layer 5 is removed at an angle of 5 ° to the soil of the reservoir by means of hydraulic monitors 6. mounted on the layer drifts 3. and 4 from the side of the soil and the roof of the seam. WAO (I’ve Eaten H |

Description

Three layers of horizontal mounting layer are taken out and flexible metal overlap 7 is mounted in it with the ends along the lateral rocks. At this, the preparation of the sub-stage for coal excavation is completed.

The cleaning works in the sub-floor are carried out in two stages by stopping under a flexible overlap. Between the layered drifts 3 and 4, the sweep layer 5 is removed into the step, which serves to ventilate the bottom and bypass of the coal pulp to the soil of the reservoir. Then, excavation of the ceiling 8 (coal thickness above the slide layer between the sublevels) is carried out the soil to the top of the reservoir, at first, by converging steps 9 at an angle a, and then expanding steps 10 at the same angle. The angle "is determined from the expression

tga

zah gpgor

where 13ah. - the amount of entry, m;

gpgor - horizontal seam thickness, m.

The recess of the ceiling 8 converging with the stoppers 9 moves the end rope 11 along the lateral rocks towards the step of the stowage in the direction of hanging from the soil of the formation, creating a certain overlap of flexible overlap. Subsequent excavation of the ceiling with expanding tabs 10 displaces the end rope 12 to the side of the seam at the roof of the seam. By removing a row of inlets, the end cable 12 is lowered onto the soil of the underlying substage, completely blocking the coal strata, and thereby landing a flexible overlap from the developed substage into the sub-floor to be developed in the direction from the soil to the roof of the formation. Subsequent sub-floors work in a similar way;

Claims (2)

1. The method of developing powerful steep and inclined coal seams, including the development of layers by sub-floors, carrying out in the sub-floors of layer workings, excavation of the installation layer and installation in it of a flexible metal ceiling with ends along the side rocks, working out of reserves of the sub-substage by flexible overlapping joints coal jetting of the layered workings under the collapsed rocks, which is characterized by the fact that, in order to reduce the loss of coal and move it with the collapsed rocks by the directional movement of the flexible overlap from the substage to the sub-floor, the entry of each entry in the sub-step is carried out in two stages; first, the step of the entry is carried out by excavating the bottoming layer with opposite ends from the sides of the soil and the roof of the seam, then I work reserves above the bottoming layer, at the same time n are moved a step of the inlet ends of the flexible overlap along the lateral rocks at the beginning of the soil, and then at the top of the reservoir with a notch converging at an acute angle of the inlet from the soil of the reservoir, and then the expanding approach at the same angle from the roof of the reservoir, and the flexible overlap from the developed substage to the subsurface to be developed in the direction from the soil to the roof of the reservoir is planted, 2. Method pop. 1, characterized in that the recess of converging and expanding approaches is carried out at an angle determined by the ratio of the width of the approach to the horizontal thickness of the formation. 1 Gch.- /// ALA / UH / /// ///  h: i “H: "P N x / xx xxx / yi / z ff777 7/7 / 4 / /// / No. Ssfss / 57a Fy. 2 zah 12 1  / U //// U /// eleven Thebes. five