RU1813178C - Method of mining steeply inclined and steeply dipping coal seams - Google Patents

Abstract

Usage: used in the development of steeply inclined and inclined coal seams. SUMMARY OF THE INVENTION: coal excavation is carried out in blocks, deep wells are drilled in the blocks, which explode with deceleration into vertical compensation spaces formed by the depletion of the formation. Compensation spaces are formed by drilling large diameter wells along the strike of the formation within each block, each well is designed for each series of milli-slow explosions, and the slowdown between the first and second series of explosions is taken to be 45 m.s. beat.

Description

The invention relates to the mining industry, and in particular to non-standard steep slope and steep dip coal seam development systems.

The aim of the invention is to ensure the safety of operations during coal mining, reducing the volume of preparatory workings, more complete extraction from the bowels of coal and reducing its ash content.

In FIG. 1 shows a formation, vertical projection; in FIG. 2 is a section AA in FIG. 1; in FIG. 3-5 - reservoir with different diameters of compensation wells and various reservoir powers, horizontal projections.

The goal is achieved in that the preparation of the excavation section is carried out as for mining seams with breaking off coal with long wells, i.e. conducting a sub-floor or twin drift 1 in the presence of ventilation and intermediate (conveyor) drifts 2 with a distance between them of 25-40 m, running

furnace 3 in the presence of furnace 4, which was a running one for the previous blocks, instead of a split one for this block. But then, within the removable chamber (along a strike of 11-18 m), 4 m from the split furnace 4 and further along the strike through 3.5-4 m, compensation wells 5 with a diameter of 500-1500 mm are drilled in one or two rows, depending on the thickness of the reservoir and the diameter of the wells.

The indicated distinctive feature leads to a new effect that is not inherent in the known development methods: uniform distribution along the strike of the compensation space. In the form of wells reduces the total volume of the compensation space, eliminates the need for a compensation chamber - dangerous and time-consuming work, and in case of block collapse, sequential blasting of boreholes charges in wells 6 with a diameter of 100 mm due to explosive pulses of alternating direction and on (L

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The presence of compensation wells between the charging charges leads to a more complete and uniform loosening and breaking of coal, which is discharged from the conveyor 8 through the coal-laying lei 7.

In order to reduce disturbances of the interchamber pillar, 9 m of preventing the release of rock from the extinguished chamber, the blasting of the second borehole charge is slowed down by 45-75 ms, and the presence of compensation wells reduces the impact force from the explosion on the interchamber pillar,

Formula of the invention.

A method of developing coal seams of steeply inclined and steep fall, including the preparation and cutting workings, excavation of coal blocks.

drilling in blocks of deep wells, breaking coal by blasting wells with a millisecond deceleration into vertical compensation spaces formed by

the extension of the formation, and the shipment of beaten coal, characterized in that, in order to increase the efficiency of blasting operations, reduce the complexity and the formation of compensation spaces and

To reduce the impact of blasting on the inter-chamber pillar, vertical compensation spaces are formed by drilling large diameter wells along the strike of the formation within each

block, and each compensation

a well is designed for each series of millislow explosions in a block, while

slowdown between the first and second series

explosions are taken equal to 45 ms.

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