SU1162988A1 - Method of relieving amine working - Google Patents

Abstract

A METHOD OF UNLOADING THE MINING CONTOUR, including carrying out production with a flat roof and creating destruction along the entire length of the production of discharge w, spruce trees filled with a pliable material, characterized in 1-2 dimensions of the height of excavation on the contact of the roof and sides with the angle of elevation to the horizon, not exceeding them, the angle of internal friction of the rock destroyed in the unloading walk. sl CZ about: y from 00 00

Description

The invention relates to mining and can be used in the construction and operation of mines and mines built in strong homogeneous rocks at different depths from the surface when large horizontal tectonic stresses exist in the massif.

There is a known method of reducing the concentration of squeezing, their stresses in the roof of the mine when the horizontal tectonic stresses in the maside exceed the vertical ones by increasing the width of the mine. It is recommended to maintain the ratio of width to height of excavation, equal to the ratio in the intact array of horizontal and vertical stresses. Stresses in the roof can be reduced by 1.5-2.0 or more times 1.

However, the use of this method necessitates an increase in 1.5-2.0 or more times the cross-section of the excavation, leads to a sharp rise in the cost of excavation of the excavations. With a high level of horizontal tectonic stresses, this method becomes economically unprofitable, and, moreover, non-technological.

Closest to the present invention is a method for unloading a mine working circuit, which includes carrying out a flat roofing and creating destruction along the entire length of the working of discharge slots filled with compliant material 2.

The disadvantage of the known method, provided that only gravitational stresses act in the massif, is that it is envisaged to reduce the stresses only in the sides of the mine. When creating cracks in the roof of the workings, the concentration of tensile stresses increases, which leads to the need to fix the roof of the excavation. Another disadvantage of the method is its limited use. The method is effective only in relatively plastic and inhomogeneous sedimentary rocks of coal deposits, which allow the creation of modern cracks in the coal seam 0.1-0.3 m thick and their subsequent smooth closure under the influence of vertical stresses without destroying the production contour. In homogeneous hard rocks, this method of unloading a production contour is inefficient due to the absence of a weak reservoir, the difficulties of creating a solid gap 0, 3 m thick, and the need to fix the excavation.

The purpose of the invention is to reduce the cost of maintaining roofing production.

The goal is achieved by the fact that according to the method of unloading the mine working contour, including carrying out the excavation with a flat roof and creating destruction along the entire length of the working of the discharge slots filled with pliable material, the discharge slots create a depth equal to 1-2 times the height of the excavation at the contact of roofs and sides with an angle of elevation to the horizon not exceeding the angle of internal friction of the rock destroyed in the discharge gaps.

FIG. 1 shows production, cross-section; in fig. 2 -d, view in plan; in fig. 3 shows the dependence of the change in the stress concentration ratio on the ratio of the span to the height of the excavation.

Production 1 is made from a flat roof in the usual way with height and width a. The slits 2 can be created in the process of excavating a mine by drilling a series of wells and their subsequent camouflaging.

The length of the slots t is chosen depending on the level of horizontal tectonic stresses acting in the array within a single or double generation height (h), (). This ratio is taken from the following. As can be seen from FIG. 3, already with a ratio of generation overfall to a height equal to three coefficients of concentration of tangential stresses, Kfj is close to unity, a further increase in the ratio of% to 5 results in a decrease in the coefficient by only 10-20%. In relation to the overflight of the excavation to a height of more than 5, an insignificant decrease in the stresses on the production contour is noted. The formation of cracks in length is non-technological and economically impractical, since the additional effect of roof unloading is insignificant (no more than 100%).

When conducting the production, the gaps are created on the contact of the roof and the generation blocks, since their creation in the blocks does not lead to a significant decrease in the stresses in the roof of the excavation. The slots are made at an angle to the horizon, which gives an even greater unloading of the roof of the excavation, while the angle of inclination is taken to be equal to the angle of the internal friction of the rocks unloaded in the slot so that they do not collapse into the excavation. In addition, it makes it possible to use rock fractured in the gap as a ductile material. KUCH)

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Claims (1)

METHOD FOR UNLOADING THE MINING WORK CIRCUIT, including carrying out excavations with a flat roof and creating destruction along the entire length of the development of unloading slots filled with pliable material, characterized in that, in order to reduce the cost of maintaining the working roof, unloading slots create a depth of 1-2 sizes production heights at the contact of the roof and sides with an angle of elevation to the horizon not exceeding the angle of internal friction of the rock destroyed in the discharge slots. Figure 1 (L s © QO Q0