SU1460263A1 - Method of mining rock burst-hazardous seams at turn areas of mining unit - Google Patents

Abstract

The invention relates to coal industry and allows to prevent rock blows at the entrance of the mechanized complex into a turn and its exit from the turn. The pillars are delineated by preparatory workings (B). From the latter, to both sides of the corner points of the pivot of the complex, to a width equal to the width of the significant influence of the reference pressure, relief wells (C) are drilled into the coal seam. At the same time, from preparatory B, the oblique C 3 of the main roof of the reservoir is equal to half the width of the zone of significant influence of the clearing B, with an elevation of the bottom of the inclined C above their mouth equal to 3-4 tons, where m is the coal seam thickness. Then, by hydrodynamic stratification, the stratification of the rocks of the main roof is carried out, during which they form a kx separation zone with a radius equal to half of the clearing zone of influence. in the process of coal mining, throughout the entire area of the pivot of the complex from treatment plant B, a periodic shock hazard prediction is carried out and from preparatory mine B — a constant shock hazard prediction. In the process of changing the length of the clearing the elongation and shortening of the specified complex is carried out. 2 hp f-ly, 2 ill. i (L

Description

four

but

The invention relates to the coal industry and can be used in the development of coal seams by underground mining.

The purpose of the invention is to prevent rock bursts at the entrance of the mechanized complex to the turn and its exit from the turn.

FIG. Figure 1 shows the technological scheme of the site of the complex turn; in fig. 2 shows section A-A in FIG. one.

The method is dried in the following way.

At a distance C equal to the zone of dry influence or very low slab, points B and D are pre-drilled

large diameter wells (100-600mm) Centers of zones subjected to hydrodynamic stratification, marked by points O and O; located at a distance of C / 2 from the ventilation flaps 1 and 2 and passage 3 and at a distance of C / H2 from points B and D. Their height above the reservoir is selected based on the specific strength properties of the rocks of the main roof in such a way that in order to ensure its layer-by-layer twisting when reaching a length equal to the step of secondary sediments without significant lags of large blocks.

The enhanced hazard prediction begins when the cleaning face approaches points B and D at distance C and continue

about

with

until it is removed from the indicated points at a distance of at least C.

Pre-drilling of the relief wells is necessary, since when the complex is reversed, conditions similar to those arising during the development of pillars are created. At the same time, the most favorable zones for the occurrence of rock bursts are in the vicinity of points B and D. The width of the prophylactic zones is chosen C, assuming that, starting from this distance, an increase in the concentration of stresses in the pillars occurs most quickly. This is also evidenced by the experience of the occurred mountain beats during the turn

ten

wellhead 1 m. It was calculated based on the criterion for determining the heavy roof. Since in this case the immediate and main roofs have similar strength properties (b, 80 MPa), and the thickness of the immediate roof is measured from zero to 30 m on the length of the excavation column, the strength of the easily damaged part of the roof must be at least 11 m to match. Then it is general, and the length of the well for stratification is about 16 m. Of the preparatory workings from points B and D (Fig. 1), 5 meters are installed in both directions along five sensor electrodes connected to

complex. In addition, an array adjoin- 15 two remote control systems for

vent to the bromide, undergoes a double action of the reference pressure. Therefore, on the parts of array C from points B and D, the geopolitical potential of ESEP should be located, since each of them is designed for ten sensors. Development of the reservoir in both pillars is performed with the fourth category of shock hazard and

the backgrounds or potential sensors of the ESEP, Qo – Q only when approaching the point B (the distance combined with the equipment of a continuous con œ is 8.5 m) one third of the catheters were fixed behind the stress state and

B) established in the preparatory development. On the areas of lava adjacent

You predict the impact hazard for each excavation entirely during the passage of the right flank of the clearing slab with respect to points B and D within ± C. Artificial stratification of the rocks of the main roof is used to reduce the dynamic loads on the massif during the collapse of the main roof. Since the most dangerous zones from the standpoint of the possibility of the occurrence of rock bursts are zones (Fig. 1) in the form of squares with vertices at points B and D and with a side equal to C, it is necessary to unload the array exactly in this area, therefore the centers of the bundle O and O must be from points B and D

to the left flank at the exit of the shtyb, a third category was also fixed, 25

thirty

allowed to work out the prepared two extraction columns without dynamic manifestations of rock pressure and additional measures to prevent them.

Claims (3)

1. The method of mining coal seams, prone to rock bursts, at the site of the turn of the mechanized complex, including the contouring of the pillars of the preparation .. ----- at a distance C /, and from preparatory workings, excavation of coal over the entire area workings - at a distance of C / 2. Example. Two mating pillars are cut into the mine for the development of the seam for cutting out by a mechanized complex with its turning and passing from one excavation column to another. According to the nomogram, it is determined that with a removable power of 3, 7 m and a working depth of 200 m, the zone of influence of the clearing excavation is about 50 m and the zone of significant influence of the clearing excavation is 25 m, since according to the VNIMI studies it is about half of the total the extent of the zone of influence of sewage treatment. Thus, the unloading of the mechanized complex, the elongation and shortening of the specified complex in the process of changing the length of the clearing face, different in that, in order to prevent rock bursts at the entrance of the mechanized complex into a turn and its exit from the turn, both sides of the corner pivot points of the complex to a width equal to the width of the zone of significant influence of the reference pressure of the clearing generation, discharge wells are drilled into the coal seam, and simultaneously with the drill the said wells from preparatory development boreholes with a diameter of 150 mm were drilled into the main at a distance of 25 m from the advanced development and along it relative to points B and D (Fig. 1). The centers of the stratification by the method of hydrospic stratification, i.e. the points where the shafts are located, located at the bottom of the inclined wells, drilled from the preparatory workings at an angle of 43 ° at a distance of 12 m from them and from the advanced development. Their height above the roof of the seam equal to half the width of the zone of essential influence of the cleaning development with the above-mentioned downhole above their mouth equal to (3-4) w, where m is the coal seam thickness, then 55 produce the separation of the main roof rocks, while in the process of coal mining over the entire area, the reversal of the complex from the clearing generation is carried out periodically, and 0 wellhead 1 m. It was calculated based on the criterion for determining the heavy roof. Since in this case the immediate and main roofs have similar strength properties (b, 80 MPa), and the thickness of the immediate roof is measured from zero to 30 m on the length of the excavation column, the strength of the easily damaged part of the roof must be at least 11 m to match. Then it is general, and the length of the well for stratification is about 16 m. Of the preparatory workings from points B and D (Fig. 1), 5 meters are installed in both directions along five sensor electrodes connected to 5 two remote control systems two remote control systems potential of the ESEP, since each of them is designed for ten sensors. Development of the reservoir in both pillars is performed with the fourth category of shock hazard and B) established in the preparatory development. On the areas of lava adjacent to the left flank at the exit of the shtyb, a third category is also fixed, which allowed to work out the prepared two extraction columns without dynamic manifestations of rock pressure and additional measures to prevent them. Invention Formula 1. The method of mining coal seams, prone to rock bursts, at the site of the turn of the mechanized complex, including the contouring of the pillars by preparatory workings, the sinking of clearing reversal of the mechanized complex, lengthening and shortening of the said complex in the process of changing the length of the cleaned slab, differing in m. that, in order to prevent rock bursts at the entrance of the mechanized complex in the reversal and its exit from the reversal, from the development workings to both sides from the corner pivot points of the complex to a width equal to the width of the zone of significant influence of the reference pressure of the clearing generation, relief wells are drilled into the coal seam, while simultaneously drilling these wells and preparatory vyrabo5 the current is drilled into the main wells the roof of the seam equal to half the width of the zone of essential influence of the cleaning development with the above-mentioned downhole above the wellhead equal to (3-4) w, where m is the coal seam thickness, then the main roof rocks are separated, and the coal is dredged by the entire area of the reversal of the complex from the sewage treatment is carried out from the preparatory workings - a constant forecast of shock hazard. 2. A method according to claim 1, characterized in that the stratification of rocks is carried out by hydrodynamic stratification. 3. The method according to claim 1, characterized in that during the separation of the rocks of the main roof, they form a zone of separation with a radius equal to half the width of the zone of significant influence of the clearing generation. FC, g.1 Aa ABOUT hh