RU2091582C1 - Method of mining of mineral beds at large depths - Google Patents

Abstract

FIELD: mining; applicable in underground mining of mineral bedded deposits at large depths. SUBSTANCE: the offered method includes driving of development workings and mining of bed by longwall method. Left between longwall and development working located on the side of worked-out space is mineral pillar. Width of pillar is taken equal to depth of spreading of intensive fracturing zone of rocks of immediate roof in vicinity of development working. EFFECT: higher efficiency. 2 dwg

Description

 The invention relates to mining and can be used in underground mining of mineral deposits (coal, salt, etc.) at great depths.

Known methods for developing strata of minerals, including the conduct of local preparatory workings and targetless mining of strata of minerals with long mining faces [1]
The disadvantage of these methods when used at great depths is the increased intensity of roof rock collapse at the end sections of lavas adjacent to the worked out space.

A known method of developing strata of minerals, including carrying out preparatory workings, outlining the pillars of minerals, and processing columns of minerals with long mining faces [2]
When processing a mine field between pillars of minerals, mineral pillars are left, the width of which is determined from the condition of ensuring the stability of reused preparatory workings. The disadvantages of this method is the increased intensity of the collapse of the roof at the end sections of the lavas adjacent to the worked out space, when mining seams at great depths.

 The purpose of the invention is the elimination of these disadvantages, namely the intensity of the collapse of the roof at the end sections of the lavas adjacent to the developed space.

 For this, the length of the lava is taken less than the distance between the preparatory workings, outlining the mined mineral column, by the width of the pillar of the mineral that is left between the lava and the preparatory mine located on the side of the worked out space. The width of the pillar is taken equal to the depth of distribution in the vicinity of the preparatory mine, located on the side of the worked out space, the zone of increased fracture of the rocks of the immediate roof.

 The essence of the proposed method is illustrated by the circuit shown in FIG. 1 and 2.

 In FIG. 1 shows: 1 preparatory development located on the side of the worked out space; 2 cracks in the rocks of the immediate roof; 3 main roof; l the depth of distribution into the massif of the zone of increased fracturing of the rocks of the immediate roof in the vicinity of the preparatory mine while maintaining it at the border with the mined-out space; h thickness of rocks of the immediate roof.

 In FIG. 2 shows: 1 preparatory development; 4 failure; 5 - walker; 6 pillars of minerals.

 The reason for the collapse of the roof in the areas of lavas adjacent to the developed space is the increased disturbance of the rocks of the immediate roof by cracks of operational origin 2 (Fig. 1). The appearance of cracks, in turn, is associated with a high concentration of stresses in the zone of reference pressure arising at the fixed edge part of the mineral massif.

 When leaving a pillar of mineral between the lava and the preparatory mine, the width of which is equal to the depth of distribution in the rocks of the immediate roof of the zone of increased fracture, the destroyed rocks of the roof are located above the whole. This eliminates the possibility of collapse of the roof rocks at the end section of the lava adjacent to the worked out space.

 For specific geological conditions, the value of the parameter l (Fig. 1) can be determined by mine, laboratory or analytical studies.

 Using the proposed method in the conditions of mines working out formations at great depths reduces the duration of downtime of lavas associated with the elimination of the consequences of dumps. In the conditions of deep mines of the Eastern region of Donbass, this increase reaches 10-15. In addition, the safety of miners of the working face increases.

 The scope of the proposed method are mines processing mineral strata at a depth of more than 500 600 m

An example of a specific implementation when mining the formation of L ₆ mine them. 50th anniversary of October JSC "Gukovugol". The thickness of the formation is 1.3 m, the angle of incidence is 10–15%; the depth of mining is 900–1200 m. The thickness of the direct roof, represented by sand-shale, is 0.9 1.1 m. ventilation drift in the period of maintaining it on the border of the worked out space according to mine observations is 2.0 2.5 m.

 When conducting treatment work between the lava and the longline ventilation drift 1 (Fig. 2), a pillar of coal with a width of Z 2.5 m is left (Fig. 2).

 To ensure the exit from the lava behind the lava, a lining is installed along the edge of the pillar, detaching part of the worked out space for use as a walker 5 (Fig. 2). Failures 4 pass between the walker 5 and the ventilation drift. The distance between the failures is taken equal to 8 10 m, the width of the failures 4 2 m.

Claims (1)

 A method of developing strata of minerals at great depths, including carrying out preparatory workings and mining strata with lavas, characterized in that the length of the lava is less than the distance between the preparatory workings on the width of the pillar of the mineral, which is formed between the lava and the preparatory working located on the side of the mined space, while the width of the pillar is taken equal to the depth of propagation in the vicinity of the specified preparatory development of the zone of increased cracks vatosti rocks close the roof.

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