SU1024596A1 - Method of carrying-out along-seam mine workings on seams inclined to sudden outbursts of coal and gas - Google Patents

Description

The invention relates to mining and can be used in the preparation and mining of an excavation site on seams prone to sudden outbursts of coal and gas.

There is a known method of conducting mining workings at outburst-hazardous formations, which includes carrying out coal-rock (mixed) bottom workings, while local measures are taken to prevent sudden outbursts during the drilling process or to drill the coal seam of the coal seam.

The disadvantage of this method is that it requires carrying out special methods for preventing sudden surges, for which time is allocated from the passage cycle, which reduces the pace of development workings.

The closest in technical essence and the obtained result to the proposed is a method of carrying out mine workings on outburst-hazardous formations, including separate excavation of rock and coal, with the formation of a discharge cavity in the roof of the bed leading ahead of the coal face on 2 m 2.

The disadvantages of this method are that with relatively strong rocks (| 5) it cannot be applied according to the condition of rock destruction, and with a smaller rock strength does not exclude; the danger of breaking them during the excavation process and after the excavation of the protective layer and discharge cavity in which there is no support Making a discharge gap complicates the technological process of penetration and requires special time to complete the work on creating the gap, besides the small length of the gap does not allow for the effective discharge of the formation from rock pressure and pre-degassing it.

The aim of the invention is to prevent sudden outbursts of coal and gas by preloading the coal seam from the action of rock pressure and pre-degassing it.

The goal is achieved by the fact that according to the method including

separate excavation of the rock and coal, initially, the excavation is carried out on the rocks of the immediate roof of the reservoir for the entire design length or 5 lengths of at least 200 m, and the excavation of the coal seam is carried out after the development of the rocks of the immediate roof in the direction of the rock face at a speed not exceeding the speed of movement of the breed slab.

The method is carried out as follows.

Initial production is carried out

 only on the rocks of the immediate roof of the reservoir with the projected width and the height allowable for its use for the intended purpose, and the soil of development is undisturbed

 the coal seam or interlayer. direct roof, while if the base of excavation is not carried out parallel to the coal seam, the interlayer of rocks is

 a wedge-shaped prism, the sloping side of which contacts the coal seam, and the maximum height of the prism

composer

where oosi is the width of the excavation at the base;

Co is the dip angle. After completion of the penetration for the entire design length of the excavation or in the process of excavation, when the rock face

5 will be removed at least

200 m, proceed to the excavation of the coal seam within the limits of the ongoing development, in the direction of the rock face, at a speed not exceeding the speed of movement of the rock slab.

The exclusion of the possibility of significant violations of the integrity of the coal seam of the excavation left in the soil during its penetration preserves the lateral spread, and hence the bulk stress state in the reservoir, at least starting from the line of contact with the lateral walls of the excavations. This, on the one hand, eliminates the possibility of the destruction of the coal in the zoning zone of the reservoir by gravitational forces brought out of the state of static equilibrium when the array is weakened by production, and the other eliminates the possibility of spontaneously increasing outflow of methane from the inlet zone into the mine, and hence the possibility

the destructive effect of gas on the coal mine lying in the soil

At the same time, direct exposure of the coal seam over a large area or partial exposure of the seam with the triangular prism of the direct roof rocks above it, when penetrating the roof rocks, as well as maintaining this state of the reservoir for a long time, creates very favorable conditions for gradual gas filtration and, as a result, degassing of the reservoir and its interfering rocks. By the time the excavation commences, the coal seam in the zone of influence of the preparatory mine will be degassed and brought to the non-hazardous state. Therefore, notching coal is not only directly from

soil soils, but also at some distance from the walls, are produced without first performing any special measures to prevent sudden outliers, using coal from an array to do any of the known methods used in conducting workings on non-hazardous formations.

The advantage of the proposed method is that its use eliminates sudden outbursts or reduces their intensity during mining operations, the method does not require any anti-blowout measures, thereby eliminating the need for large amounts of money to eliminate the effects of gas-dynamic effects and blowout event.

Claims (1)

METHOD FOR CONDUCTING LAYERED MINING PRODUCTION ON LAYERS TENDING TO SUDDEN COAL AND GAS EMISSIONS, including separate excavation of rock and coal, characterized in that, in order to prevent sudden emissions of coal and gas by pre-unloading the coal seam from the effect of rock pressure and preliminary degassing Initially, the development is carried out by the rocks of the immediate roof of the formation for the entire design length or for a length of at least 200 m, and the extraction of the coal seam is carried out after the development of the rocks for a short time dstvennoy roof toward the pedigree slaughter at a speed not exceeding the speed of the rock face.