SU1751332A1 - Method of mining steep coal seams prone to gas-dynamic effects - Google Patents

Abstract

Purpose The invention relates to the mining industry and can be used in the development of layers prone to gas-dynamic phenomena. The essence of the invention is ventilation and transport excavations with the formation of long pillars, which are mined with stripes leading towards the lower slopes of the overlying slopes At the same time, before excavation of each subsequent strip of coal, the stress-strain state of the marginal part of the coal seam is determined on the mate and of the strips being withdrawn, and the coal notch in each ledge begins outside the zone of increased stresses from the conjugation of the overlying step 2 silt (L

Description

The invention relates to the mining industry and can be used in the development of seams prone to gas-dynamic phenomena.

The purpose of the invention is to increase safety and reduce the complexity of developing steeply dipping coal seams that are prone to gas-dynamic phenomena, by conducting work outside the zone of stress concentration from the angle of a ledge of the previous strip.

FIG. 1 shows the scheme of the clearing flank; Fig 2 - the part of the slab on the example of which is shown the sequence of excavation of strips of coal

The method is carried out as follows.

Within the floor to be worked out, the аточ 1 and the ventilation 2 drifts are conducted, between which a step-down cleaning face 3 is formed so that the joints of the ledges are stepwise

The assessment of the stress-strain state of the marginal portion of the formation is carried out, for example, by the exit of a plug from a well, by an analytical method, or by modeling.

Taking into account these data and the fact that in the conditions of a steep fall mine, the bottomhole protection is carried out by a timber support, the constituent elements of which have a dip depth of 2.0 m, the step length on the joints of the ledges should be taken as a multiple of 2 , 0 m

Thus, in the proposed method of developing steep coal seams, the notch of the next coal strip begins at a distance of 2.0 m or more below the internal angle of the ledge. After excavating this strip of angle 4, the next notch of the next strip also begins VI

sl with

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to

at a distance of at least 2.0 m from the newly formed angle of 5, and so on

The stepwise mating of the ledges provides improved ventilation of the cleaning space, simplifies the process of securing the bottom and controlling the rock pressure, which leads to a reduction in the labor intensity of the development of steep coal seams. Dredging the coal outside the stress concentration zone dramatically reduces the likelihood of coal collapsing (precipitating) from the overhanging mass and initiating sudden coal and gas emissions during the coal mining process.

Claims (1)

Invention Formula A method of developing steeply dipping coal seams that are prone to gas-dynamic effects, including carrying out ventilation and transport workings, forming long pillars, working them off with stripes with inferior slopes ahead of the lower slopes of the bottom slopes, in order to improve safety and reducing the labor intensity of the workings; in conjunction with the ledges, the bottom is formed stepwise; in this case, before the excavation of each successive band of coal, a stress-strain state of the edge is determined The coal part of the coal seam on the interface of the overlying and removable strips, and the excavation of coal in each ledge begins outside the zone of high stresses from the coupling of the upper overlying shoulder. Ф г.1 4ig.2