SU1642012A1 - Method of supporting a development working - Google Patents

Abstract

This invention relates to underground mining of coal with aimless protection of workings. The goal is to reduce the cost of maintaining production by increasing its stability when reused. Carrying out and fixing workings are carried out. Production is carried out with cutting from the side of the column originally worked before the start of cleaning works in it. Processing windows form process windows outside the reference pressure zone from cleaning works by installing rows of organ support at an angle to the longitudinal axis of the mine. In the rocks of the roof, the bracing drills the cut-off wells at a distance from the production equal to at least twice the removable thickness of the reservoir, and the roof rock is loosened by injecting water into the wells and forming a longitudinal cut along the wellheads of these wells. From the side of the pillar worked in the cross, the undisturbed rock cantilever is formed by the collapse of the roof in the plowed out space of this pillar in the process of cleaning works in it 3 or 3

Description

The invention relates to the mining industry and can be used in the underground mining of coal and other deposits with reservoir occurrence of mineral resources by the development system with long pillars with aimless protection of reservoir workings.

The purpose of the invention is to reduce the cost of maintaining production by increasing its stability when reused.

FIG. 1 shows the scheme of protection of reservoir production; in fig. 2 - crossbar with installed organ lining, general view; in fig. 3 - collapse and freezing of the roof along the longitudinal cutting line, general view.

The scheme for carrying out the method contains the column 1, which is initially being worked out, preparatory production 2, struts 3, lining 4 production, a series of 5 organ supports, a series of 6 inclined wells, a longitudinal section 7, and technological windows 8.

The method of maintaining preparatory development is carried out as follows.

Before the start of the cleaning works, the production of 2 with a cleavage 3 is carried out from the side of the initially worked up pole 1. The necessity of carrying out the bobbin 3 is due to the fact that after mining of the extraction column, it is impossible to pinch organ support by 5 rocks of the immediate roof in a small area from 4 N

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for the limited possibilities of creating a high bearing capacity of organ lining 5 installed in a broken array. The organ support, established in the massif disturbed by rock pressure, loses stability and its use in these conditions is ineffective. Therefore, organ support 5 is installed in the projection 3 in several rows in order to create a certain area of undisturbed roof rocks, under the protection of which the first column 1 is worked out. The width of the crossband 3 is taken not less than twice the extracted thickness of the reservoir.

Production 2 is secured by a conventional inventory support, for example, wood 4. And a cross stitch 3 rows of organ support 5, mounted at an angle to the longitudinal axis of the excavation. The transport of minerals from lava is carried out through technological windows 8 formed between rows of organ support 5 outside the reference pressure zone. The height of the drive head of the conveyor, as well as the development of a bit lower than the brace 3, provides the necessary angle (30 - 45 °) for the transportation of coal by gravity (Fig. 1 and 2),

In the roof of the cross section 3, a row of cut-off wells 6 are sub-tilted to the plane of the formation 60-70 and parallel to the development 2 at a distance from it not less than twice, the removable thickness of the formation. The angle of inclination of the wells b is determined by the convenience of drilling. The main requirement of the well 6 should be in a plane parallel to the ongoing development 2 and perpendicular to the coal seam. Water is pumped into wells 6 in order to form weakened areas of rocks parallel to protected excavation 2 (Fig. 2) Next, along the line of boreholes b, a longitudinal cut 7 is formed, for example, by means of blasting, at a depth of 1 - 1.5 m. in wells 6, the lower part of the well will be sealed and there will be no weakened zone, therefore the longitudinal cut 7 serves to weaken this zone, as well as to form a caving plane. The cut 7 is also performed in order to increase the accuracy of the formation of the collapse plane of the main and immediate roofs with respect to

2. The injection of water into the poast and the formation of a longitudinal cut 7 are also carried out before the start of cleaning works, but the creation of a local zone of weakened rocks outside the protected area 2. At the same time, the rocks of the main and non-seated roofs over the preparatory development are intact. In the process of cleaning works in

Claims (1)

the extraction column 1, under the action of the forces of the supporting pressure of the lava, collapses the main and immediate roofs along the line of the cut 7 and forms the rock console on the side of the column being processed, which is directly above the adjacent excavation and cross section 3, which is maintained by the organ lining 4 With this, the next excavation column will be refined at a stable roof condition and under more favorable conditions. Claim method of maintaining preparatory development, including fixing production, erection of organ lining, drilling cut-off wells in roof rocks, collapse of rocks in the developed space of columns of adjacent lavas in the course of cleaning works, which is due to the fact that, in order to reduce the cost of maintaining production by increasing its stability during re-use, production is carried out with a cross-section from the side of the initially worked up column before the start of the cleaning works in it, technological windows are formed in the cross-section outside the reference pressure zone from the cleaning works A series of organ supports at an angle to the longitudinal axis of the mine, the drilling of shut-off wells in the roof rocks is carried out in a cross-section at a distance of not less than twice the recoverable thickness of the reservoir, weakening the roof rocks by injecting water into the said wells and forming a longitudinal cut on the line of the mouths of these wells, the boreholes are made in the cross section from the side of the column being worked out, the undisturbed rock cantilever by the collapse of the roof in the worked out space of this column. C / s, intended for the original altra & ojuki . . . . . . / W. . / and -and well Pillar, lrednaznachevim / nd for the subsequent o / grsg & otkhi 1   " V OK:  eight Compiled by V. Cherkasheninov Editor A, DolynichTekhred M. MorgentalKorrector N.Korol Order 1130 Circulation 310 Subscription VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab, 4/5 Production and Publishing Combine Patent, Uzhgorod, Gagarin St., 101  H