SU400704A1 - COMBINED SYSTEM FOR THE DEVELOPMENT OF POWERFUL RIGHT STRAAMS - Google Patents

Description

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The invention relates to the mining industry and can be used in the development of powerful KpyiTbix coal seams at anchoring depths with a full hydraulic gap in the developed spaces a.

A well-known combined system for the development of thick steep seams with hydraulic laying of the developed space in which the lower layer is removed in a descending order by short strips along the strike and the remaining part of the reservoir is worked in an upward order of the alternate layers.

However, experience shows that when the protective layer is located near the reservoir due to the large shrinkage of the backfill array, intense cracking is observed, but in an overhanging coal mass, which complicates the upward development of the subsurface strata, even if it is completely unloaded.

In addition, the development of a protective layer in the dip of the reservoir is accompanied by some TexiHiHiHecKHMH complications of 1 mi due to the difficulty of maintaining the overhanging coal massif and the difficulty of removing waste water.

In the proposed development system, the upward order of mining layers is replaced by the descending one.

In order to ensure complete filling

the space developed and the prevention of penetration of the bookmark into the lower layer is worked out under the protection of a continuous mesh-concrete floor.

The thick steep seam is divided into two overlapping layers: the top layer up to 2 liters thick and the bottom layer for the rest of the formation thickness. Between the layers, a continuous mesh-concrete floor is constructed, consisting of one or two rows of metal mesh, protected by a thin layer of gunned concrete.

Initially, the top layer is developed in long pillars along the strike with full

hydraulic laying of the developed space. As the clearing in the soil progresses, a continuous mesh-concrete overlap is arranged in the soil layer, an organ row is punched and the developed space is laid. In order to create a level soil, for convenient implementation of the sieve-concrete overlap, excavation of coal in lava is carried out using narrow-grab combines, such as UKR-1K, Temp and others.

After the completion of the cleaning work in the upper layer, the remaining coal is worked out under the protection of mesh-concrete covering over the formation uprising, for example, transverse-1 planar AND layers also with full hydraulic laying of the mining space.

Laying the layer at the roof of the double-bed seam (the effective unloading of the remaining coal from the fished rock pressane while maintaining the physico-mechanical properties of the coal mass, which is very important for providing an upstream order of mining, which creates the most favorable conditions for the formation of the backfill mass .

The flat mesh-concrete ceiling works well for bending and stretching as a reinforced concrete structure, the mesh is protected from corrosion and, therefore, reliably protects the working space of the lower layer from the ingress of a bookmark.

Thus, the mesh-concrete overlap, as well as the presence of evenly embedded and partially compacted mass on the upper layer, create real prerequisites for trouble-free mining of the remaining coal, lighten the fixing and maintenance of the bottom hole, and, ultimately, improve the basic technical and economic indicators of the system .

Subject invention

The combined development system of powerful steep seams with hydraulic laying and interlayer overlapping with a notch of the upper layer with long columns along the strike, and the remaining part with transversely inclined layers in the upward order, in order to ensure complete filling of the developed space and prevent penetration laying in the lower layer, the latter is worked out under the protection of a solid mesh-concrete floor.