RU2435956C1 - Method of open underground development of thick flat coal bed - Google Patents

Abstract

FIELD: mining. ^ SUBSTANCE: method involves preliminary preparation of extraction front by construction of working platform at the projection of the section board or at its bottom along the spread line on the soil level of the developed bed; erection of deep bed development complex on the working platform ; coal extraction by means of the above complex off the working platform by conducting parallel mine workings of rectangular section so that pillars are left; transportation of broken coal along the mine working to the working platform and its loading to the transport vehicle or stockpiling. Second working is started from mine working in the layer near the roof of the bed with roof bolting; at that, some part of the complex, which is located on the soil of the performed mine working, is used as the base of anchor setting device. Then, deepening of the drilled mine working to the bed soil is performed. The second mine working is performed in similar way so that a pillar is left between the first and the second mine workings. ^ EFFECT: increasing development efficiency of thick flat coal bed. ^ 3 dwg

Description

The invention relates to mining, in particular, to open-underground mining of powerful flat coal seams with a deep mining complex (FGR) from a ledge of the side or from the bottom of a coal mine.

There is an open method for the development of coal seams, including opening the bed by removing gangue deposits lying above the coal seam, planning a working site, installing mining equipment, loosening and subsequent coal mining, loading it into a vehicle, and transporting it outside the mine [1]. The disadvantage of this method is that when a coal mine reaches its maximum depth, an open coal seam going into the side of the mine cannot be removed by means of mechanization of the coal mine.

As a prototype, a method of developing a shallow coal seam was adopted, including preliminary preparation of the front of the treatment work, by constructing a working platform on the ledge of the side of the cut along the strike line at the soil level of the developed seam, installing a deep seam development complex on the working site, and mining this complex away from the work site by conducting parallel workings of a rectangular cross-section with the provision of proportionate pillars, the issuance of beaten-out coal for development to the work site and loading loading it into a vehicle or stacking it in a stack [2].

The disadvantages of the method are:

- in the case of the development of a powerful coal seam, increased coal losses in the bowels are allowed due to the need to leave the lower or upper (depending on the physical properties of the coal and roof rocks and formation soil) packs due to the limited capacity taken out by the hydraulic fracturing machine;

- a high likelihood of accidents of the working face due to the significant outcrop of roof rocks and the lack of roof fastening in the workings.

These shortcomings reduce the efficiency of developing powerful flat coal seams using open-underground mining.

The purpose of the invention is to increase the efficiency of developing a powerful flat coal seam by open-underground mining by increasing the completeness of the extraction of reserves by layer-by-layer coal extraction during mining and roof anchoring in the mine workings.

This goal is achieved by the fact that in the method of open-underground mining of a powerful flat coal seam, which includes preliminary preparation of the front of the treatment works by constructing a working platform on the ledge of the side of the cut along the strike line at the soil level of the developed formation, installing on the working platform of the deep development complex, a notch coal by this complex aside from the working site by conducting parallel workings of a rectangular cross section with the left pillars, the issuance of beaten coal for the development on the working platform and loading it into a vehicle or storing it in a stack, the formation is divided into two layers by construction of the working platform on the basis of the upper layer, that is, the layer at the roof of the formation, the first production is carried out in the layer at the roof of the formation with an anchor fastening of the roof, at the same time, a part of the complex located on the basis of the excavation is used as the base of the anchor installer, then the working platform is deepened in the development zone to the formation soil, the equipment complex is moved to it and the subsequent deepening of the first development; the second generation is carried out in a similar manner.

The proposed development method is illustrated by diagrams. Figure 1 shows a diagram of the development of a rectangular cross-section in the layer at the top of the formation with the support of the roof anchor support; figure 2 - conducting development in a layer near the soil of the reservoir; in Fig 3 - the sequence of workings.

The method can be implemented as follows. On the ledge of the side of the coal mine (or at its bottom), a working platform 1 is constructed at the level of approximately the midline of the seam thickness, thus dividing the powerful seam 2 into two layers, the upper (at the top of the seam) and the lower (at the soil). Starting from the edge of the exposed part of the reservoir on the platform 1 opposite the mouth of the planned development with serial number I, the hydraulic fracturing equipment is installed.

Coal mining begins in the layer at the top of the seam by working out a rectangular cross section with a mining machine 3, fed to the coal mass by staking 4. As the mining machine 3 is deepened into the coal mass, the holes are drilled into the mining roof and the anchor support 5 is erected (the mining machine 3 is equipped with drilling machines 6). Since becoming 4 of the complex is sufficiently rigid, wide and straightforward, then to install the anchor support 5, a remote-controlled anchor installer 7 can be used, moving along the excavation at stave 4. Having installed a set of anchors, the anchor installer 7 returns to the mouth of the excavation, where it is equipped with the next set of anchors . At the same time, the movement of the stand 4 during its build-up does not limit the mobility of the anchor installer 7 to move, and the construction of the anchor support the anchor installer 7 carries out with the stationary stand 4.

After mining in the layer near the formation roof, the hydraulic fracturing equipment is dismantled, part of the working platform 1 opposite the mouth of the first excavation is deepened to the formation soil, the hydraulic fracturing equipment is returned and the excavation under number I is returned to the formation soil under the protection of the roof anchor.

After the completion of treatment work in mine I, the equipment is transferred to the mouth of the second planned mine (II) at the level of the soil of the upper layer (layer at the top of the formation), while the whole 8 is left between the mine I and II.

Thus, due to the organization of layer-by-layer conducting of openings, it becomes possible to partially extract a powerful seam from the side of a coal mine; due to the anchoring of the roof in the workings, the probability of collapse of the roof rocks is reduced not only during the work itself, but also when the bottom layer is excavated. All this indicates an increase in the efficiency of developing a powerful flat coal seam in an open-underground way, and this is the purpose of the invention

Information sources

1. Bokiy B.V. Mining, Moscow, Ugletekhizdat, 1953, p. 516-522 (analogue).

2. Netsvetaev A.G., Repin L.N., Sokolovsky A.V. Coal mining technology using deep seam mining complexes. / Coal, November 2004, p.41-43 (prototype).

Claims (1)

A method of open-underground mining of a powerful shallow coal seam, including preliminary preparation of a treatment front by constructing a working platform on the ledge of the side of the section along the strike line at the soil level of the developed seam, installing a deep mining complex on the working site, and mining this coal away from the working sites by carrying out parallel workings of a rectangular cross-section with leaving pillars, issuing beaten-out coal for working out on a working site and loading it into a trance tailor tool or stacking, characterized in that the layer is divided into two layers by the construction of a working platform on the basis of the upper layer, that is, the layer at the top of the layer, the first production is carried out in the layer at the top of the layer with an anchored roof, and part of the complex, located on the basis of the ongoing development, is used as the base of the anchor installer, then the working platform is deepened before development to the formation soil, the equipment complex is moved to it and the subsequent depth the results of the development; the second development and its deepening is carried out in a similar manner.

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