SU1765438A1 - Development working protection method - Google Patents

Abstract

The invention is used in mining, in particular in protecting preparatory workings. SUMMARY OF THE INVENTION: Ahead of the lava, outside the zone of maximum of the reference pressure, weave wells in the roof with longitudinal rows with a slope towards the cultivated field at an angle of natural rock caving and in the soil with an inclination towards the prepared section. Then install air bellows in them. The pressure in the latter is maintained within the limits of rock strength for uniaxial compression. Behind the lava, the maximum pressure is applied to the cylinders installed in the roof, impulses, contributing to the collapse of the cantilever hanging along the canal. In the zone of stabilization of displacements, the cylinders are removed and reused. 1 hp ff, 2 ill.

Description

The invention relates to the mining industry, in particular to the maintenance of development workings left behind the lava for reuse in the adjacent adjacent excavation field.

Methods are known for protecting mine workings using for unloading wells and pneumatic bellows. The essence of the methods lies in the fact that discharge wells are drilled at equal pay distances from one another or in groups directed along strata or at certain angles. The wells do not fill or install air bellows with a constant thrust, which are removed and reused when the production is redeemed. The disadvantage of the methods is the inability to continue work on the protection of excavation left behind the lava on the border with the developed space (adjoining excavation).

The method of protecting the mine workings using air bellows is also known. The essence of the method lies in the fact that relief wells are perpendicular to the action of the main stresses from the generation in the lateral rocks and cylinders with constant expansion are installed in them, which are removed and reused during generation. The disadvantage of this method is the lack of relieving the discharge to the cleaning works and regulating the pressure in the cylinders.

The closest technical solution to the invention is a method for protecting adjacent workings by unloading with the help of wells or explosives used behind the lava. For this, in the roof and in the soil of the well, the wells are drilled with an inclination towards the developed space of the working floor. In the roof they are located at an angle of 70-75 °

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and in the soil symmetrically to the first wells. The method is characterized by insufficient unloading efficiency, since the maceration is carried out behind the lava in fractured rocks and the influence on the TID resistance on the soil from the side of the array of the prepared adjacent field does not decrease.

The aim of the invention is to increase the efficiency of rock unloading and the stability of the development workings left behind the lava for reuse.

The essence of the method is the unloading of lateral rocks from stresses conducted in the first field and influencing in-ke in the second field.

The goal is achieved by unloading ahead of the clearing slab outside the maximum zone of the reference pressure, while the wells are drilled into the roof rocks in longitudinal rows at 0.3-0.5 pitch of the immediate roof collapse the working floor at an angle of natural collapse of the rocks and in the soil rocks with a slope in the direction of the adjacent floor being prepared.

In addition, pneumatic cylinders are installed in the wells under pressure, while the pressure in front of the clearing hole is maintained within the limits of compressive strength of the rocks, and behind the lava, the working fluid is fed into the cylinders installed in the roof with impulses with maximization and subsequent discharge.

FIG. 1 shows the plan of the treatment area; FIG. 2 is a section A-A in FIG.

In front of lava 1 there is a conveyor belt 2 and supply 3 (reusable), bordering the developed floor of the working floor 4. In the front of the lava there are also 5 wells in the roof and 6 in the soil, behind the lava rocks in the roof are in the frozen block of rocks 7, creating lateral bearing pressure, and wells in the soil - under the coal mass of the prepared floor.

The method is carried out as follows.

The discharge of the rocks begins ahead of the lava in the conveyor excavation 2, and ends behind the lava in the adjacent excavation 8, now ventilating. First, a zone of maximum reference pressure is established. Then, outside this zone in front of the lava, weave wells in the roof and soil in longitudinal rows.

The angle of natural collapse of rocks, under which wells are drilled in the roof

allows these wells 10 to be used after the passage of lava (in the ventilation excavation) for breaking down the block of rocks 7. Directing the wells in the soil 11 towards the second array allows to reduce the soil swelling in the ventilation excavation due to pressure from the coal array. After drilling, the wells are charged with long cylinders and fed into them.

pressure. At the front of the lava, the wells are deformed and relieve production from the temporary reference pressure. The pressure in the cylinders is maintained within the limits of compressive strength of the rocks. In wells

in the roof after the passage of lava, pressure is pulsed by maximizing it and then dropping. The dynamic effect on the blocking block 7 leads to intense cracking and contributes to the breakage of rocks at the angle of natural collapse, under which the wells were drilled in the roof.

In the wells in soil 11, after the passage of lava, the pressure in the cylinders is maintained at

previously established level within the rock compressive strength. This reduces the pressure on the soil from the side of the second floor array. Beyond the lava, when the displacement of rocks decreases, the cylinders are removed and can

used again.

The proposed method for the protection of the preparatory development allows to control the stress-strain state around the excavation in the zone of influence of the clearing face, increases the stability of the adjacent excavation and reduces the cost of maintaining it.

Claims (1)

1. A method of guarding preparatory generation, including drilling wells into the roof and soil of surrounding rocks, unloading rocks from stresses using explosives or static fracturing pneumatic cylinders installed in wells, characterized in that, in order to increase the efficiency of rock unloading and the stability of excavations left behind the lava, for reuse unloading is carried out ahead of the clearing hole outside the zone of maximum of the reference pressure, while the wells are drilled into the roof rocks with a slope toward the working floor at an angle of natural collapse of the rocks and into soil rocks with a slope towards the adjacent floor being prepared. 2, the method according to claim 1, characterized in that pneumatic bellows are installed in the wells under pressure, while the pressure in front of the lava is maintained within compactibility of rocks for compression, and behind lava there is a richer body in cylinders installed in roof, served impulses with bringing to the maximum and its subsequent discharge, 3 4 V VL YL & V // in U I  0 FIG. 2