SU1603030A1 - Method of safeguarding underground chamber - Google Patents

Abstract

The invention relates to mining and can be used for protection against mining pressure of underground workings of limited extent. The goal is to increase the degree of protection of the camera from the harmful effects of mining. For this purpose, mining of discharge lava, laying of the worked-out space, leaving the site unencumbered with filling material are carried out and the underground chamber is located within this area. Form an unencumbered area in the form of an angular sector with an angle at the vertex of 40-160 °. The outer boundary relative to the apex of the angle is placed at a distance determined by the dependence L = M (4500 / Α-10) M, where M is the formation thickness, m

α is the angle at the apex of the angular sector of the unencumbered area, deg. The method provides a higher degree of protection with equal consumption of filling material due to the realization of the spatial effect of unloading at the concave corner part of the goaf. 3 il.

Description

The invention relates to mining and can be used to protect underground mines of limited length from mining pressure (chambers of underground machines, tippers, etc.) under the following geological conditions: a coal seam thickness of 1-2 m; the angle of the rocks is O-20 °; host rocks have a weighted average compressive strength of 40- 70 MPa.

The aim of the invention is to increase the degree of protection of the chamber against the harmful effects of mining.

FIG. 1 shows a scheme for implementing the proposed method of guarding underground chambers of hoisting machines (chambers in terms of 6x8 m; development depth 1000 m; thickness of the layer 1 m containing medium-strength rocks with a compressive limit of 60 MPa); in fig. 2 illustrates an exemplary embodiment of the method when the camera touches an external border of an unencumbered security section with an angle; in fig. 3 illustrates an example of the execution of security guards for a warehouse of explosives in two unencumbered areas as opposing corner sectors.

The method consists in working off the discharge lava 1, laying the worked-out space 2 with the formation of an unsecured backfill material section 3 in the form of an angular sector 4 with an angle of 5 at the top equal to 40-160 °, and the location within the specified section of the underground chamber 6. the vertices of the angle, the boundary 7 of the chamber 6 is located from the vertex of the angle at a distance determined by the formula (4500 / a-10), where m is the thickness of the reservoir, m; a is the angle at the apex of the angular sector of the unencumbered area, degrees.

Example. To protect the chambers of 6 hoists from the harmful effects of mining, the discharge lava 1 with a length of 100 m was used with the laying of the goaf 2. With a scraper installation form05

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The unencumbered area 3 is ruled as an angular sector 4 with an angle of 5 at the apex of 80 °. Chambers 6 are constructed within area 3 after the completion of the process of active displacement, i.e. after 3 months. after working out the discharge lava 1. B; the upper relative to the top of the angle 5, the boundaries 7 of the chambers 6 are 46 meters from the top of the angle 5. The choice of the angle of the sector 4 is determined by the shape and size of the chambers in the plan, their arrangement in space and the filling technology works Thus, with a fixed laying technique (for example, when the bisector of the angle of an unencumbered sector 4 coincides with the line of dip), a maximum angle of 160 ° is recommended for chambers stretched along the strike. A minimum angle of 40 ° is appropriate for guarding a single chamber extended in a fall. An angle of less than 40 ° does not make sense, since the security sector degenerates into a known multiple discharge zone (see

prototype), at an angle greater than 160 °, the additional protective effect of the discharge disappears.

Claims (1)

Invention Formula The method of guarding the underground chamber, including working out the discharge lava, laying out the open space with the formation of an unencumbered backfill area and location within this area of the underground chamber, characterized in that, in order to increase the degree of protection of the chamber from the harmful effects of mining, the unencumbered area is formed in angular sector with an angle at the vertex equal to 40-160 °, and when the chamber is constructed, the outer relative to the vertex of the angle is placed at the distance from the vertex of the angle, m of formula X (4800 / well-10) m, where m - the power of the formation m; a is the angle at the apex of the angular sector of the unencumbered area, degrees. 1 2 j FIG. J