SU1649096A1 - Method of recovery of safety pillar under a hole - Google Patents

Abstract

The invention relates to excavation of coal by mechanized slaughter in the danger zone of coal pillars. The goal is to increase the safety of work by preventing hydraulic shock as a result of drainage of water before excavating a mineral in the danger zone of the rear pillar. In the plane of the reservoir, drainage wells are fanned out of the preparatory development with an interval between the wellheads equal to five times the diameter of the wells. When approaching, the hazardous zone to the hazardous zone forms the zone of loosening in the pillar by well charging the wells with explosives and blasting with a millisecond slowing down first of the central and then the peripheral wells. Then, above the zone of loosening of the formation, the supporting layer of the immediate roof is destroyed. In the rocks of the roof around the well, a system of water conducting cracks between the well and the loosening zone of the flipper is formed by displacing the reference pressure zone to the depth of the rear pillar array by digging in the lava of the next coal strip. After that, water is drained from the hazardous zone through the zone of loosening and drainage wells to the preparatory development and coal is dredged by the mechanized complex. 4 or 0 with ет “et.

Description

The invention relates to the mining industry and can be used primarily in coal mining with a complex-mechanized slaughter in a danger zone at a geological exploration or technical well.

The purpose of the invention is to improve the safety of work by preventing water hammer as a result of drainage of water before excavating a mineral in the hazardous area of the rear sight,

FIG. 1 shows a diagram of the excavation section of a mine floor, contoured by preparatory workings — W and a clearing face, working off the danger zone at the well} in FIG. 2 is a section A-A in FIG. 1 with a diagram for moving the plot of the reference pressure to the zone of loosening of the formation at the well (after removing each regular strip of coal in the lava); on fig.Z - preparatory development with drainage wells drilled from its

contour in the danger zone; in fig. 4 - section bb in FIG. 3, the zone of loosening of the formation below the well after blasting.

The method is carried out as follows.

In the area of the mine floor 1, contoured by the conveyor drift 2 and the ventilation drift 3, the working face 4, equipped with a mechanized support 5, for example, type KM-87UMP, is working. When mining the excavation site, lava encounters a geological exploration well 6 (or a technical well). The well is conventionally shown located in the lower part of the lava along the dip line. Danger zone 7 under the well in the form of a circle with a radius of K. c, determined in accordance with the requirements of the BOP and the Guidelines for the safe mining of flooded workings, is shown by hatching.

In the conveyor drift 2 from chamber 8 using a drilling machine (not shown), for example, type SBG-Jj plane of the formation, a row of drainage wells 9 is drilled. The central well passes through the center of the danger zone, the other wells are located at an angle of 12 ° to each to a friend with a distance between the wellheads of 3d, where d is the diameter of the well in cm.

Charging of drainage wells with explosives is carried out at the approach of a cleansing inlet to the safety zone 10, defined by the expression m, where L is the width of the safety zone, R4 is the radius of the danger zone under the well in m, 5 is the distance to the hazard zone in m .

Charging is carried out in a known manner with the help of a drilling machine and, after the hydraulic drilling of wells, charges are detonated.

First, the central charge is blown up, and then, with a millisecond slowdown, the other peripheral charges are blown up.

By blasting charges form a zone of loosening of the reservoir 11 in the pillar. In this zone, the direct roof is exposed and is supported around the perimeter of an unbroken coal massif.

The length of the onpe reference pressure zone is divided in virtually every case based on the results

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mine measurements. The length of the support pressure zone depends on the properties and structure of the roof, the speed of movement - the lava, and the method of controlling the roof in the clearing face.

By blasting explosive charges in the wells, in the zone of loosening the formation 11, a pad with an immediate roof is exposed, which enters the zone of the reference pressure.

The impact of the forces of the reference pressure when shifting its plot 12 deep into the rear sight in position 13, 14, etc., after the next coal strip is dredged in the clearing bottom on the bare area of the bearing layer of the immediate roof in the zone of loosening of the formation, the bond between the rock particles in this layer is broken . Under the action of deformation of the bearing layer of the immediate roof 15, a system of water-conducting cracks 16 is formed between the well and the loosening zone. The water 17 from the well is diverted to the cavity 18, which plays the role of a catchment basin and extinguishes the hydraulic shock. Water from the well and danger zone 7 is diverted through the zone of loosening of the reservoir 11 to the drainage wells 9 and through the mouth of these wells is released into the preparatory excavation, where it is collected in a catchment basin (not shown).

The volume of water entering the sump is taken into account to determine the degree of drainage of the hazardous area,

I After the water has been descended, work in the clearing face is conducted in a normal mode until it approaches the loosening zone of the formation. In this zone, measures are being taken that have been developed during coal extraction in areas of a mine floor with an unstable direct roof.

Claims (1)

Invention Formula The method of working out the safety pillar under the well, which includes carrying out preparatory workings, drilling in the plane of the reservoir of leading drainage wells, diverting water from the danger zone of the rear pillar and excavating the mineral from the mining face, characterized in that to improve work safety by preventing water hammer as a result of drainage water before excavation of mineral resources in the danger zone of the rear pillar, drainage wells with a fan from the preparatory mine with an interval between By means of wells, equal to five times the diameter of the wells, at the approach of the clearing inlet to the danger zone, a zone of loosening in the hole charging zone with wells of explosives and blasting with a millisecond slowdown first central and then peripheral wells is formed} then the bearing layer is destroyed roofing and in the roof rocks around the well, a system of water-dissolving cracks is formed between the well and the loosening zone of the reservoir by shifting the reference pressure zone into the rear pillar array by dredging the next strip of the mineral in the bottomhole, then the water is removed from the hazardous zone through the zone of loosening and drainage wells to the preparatory production / 2 TO Fig / fS tbur. 2 Step 3 BB sixteen /// Ш Ш ///// А FIG. H