RU2280162C2 - Method for parting preparation for further development of coal beds located one near another in permafrost zone - Google Patents

Abstract

FIELD: mining, particularly underground development of flat-laying and inclined coal beds in cold regions, for instance in permafrost zones.

SUBSTANCE: method involves cutting upper formation by means of production face; cutting slots along production face so that distance between the slots is selected to provide safe roof caving during stopped excavation of underlying layer. The slots are cut as separate depressions. Formed depressions are filled with liquid or solutions.

EFFECT: increased safety of formation development.

2 dwg

Description

The invention relates to the mining industry and is intended for the preparation of interdomain in the development of close coal seams of permafrost zone.

There is a method of preparing the interdomain in the development of converging coal seams, including mining the upper seam with a working face with cutting holes and filling them with liquid [1]. This method is taken by us as a prototype.

The disadvantages of this method are:

- the use of the method only with a horizontal field formation suite, because otherwise filling the slots with water is difficult;

- the difficulty of starting thermal elements in the slots when excavating the underlying formation, when the mine workings in the upper layer are extinguished;

- the thermal regime of production is violated, which negatively affects the safety of coal mining in the permafrost zone;

- it is practically impossible to establish the step of collapse of the direct roof in the conditions of the permafrost zone, since the direct and main roof, as a rule, are represented by a single rock mass.

The technical task in the development of the method was to preserve the surfaces of the cut openings in a thawed state without violating the thermal regime and increase the safety of development, including ensuring reliable and safe operation of mechanisms.

In the method for preparing the inter-layer in the development of adjacent coal seams of cryolithozone, including mining the upper seam with a face and cutting slots along the bottom, the new thing is that when excavating shallow and inclined seams, the cut-through slots are made in the form of separate containers and the formed tanks are filled with hardly freezing liquids or solutions , and the distance between the slots is taken from the condition of safe collapse of the roof during the cleaning recess of the underlying formation.

Introduced into the claims, such an essential feature, as the fact that when excavating shallow and inclined formations, cut-through slots are made in the form of separate containers, can significantly expand the scope of the proposed method.

An essential sign that the formed containers are filled with hardly-freezing liquids or solutions makes it possible to keep surfaces in cut holes in a thawed state for a long time due to the presence of hardly-freezing liquids or solutions in containers.

The next significant sign that the distance between the slots is taken from the condition of safe collapse of the roof during the cleaning recess of the underlying formation, ensures reliable and safe operation of the mechanisms.

The proposed method is illustrated by drawings, where in Fig.1 shows a section of a section of mining along the extraction column, in Fig.2 - section aa in Fig.1.

Symbols adopted in the drawings: 1 - coal field; 2 - close layers; 3 - mechanized complex; 4 - vertical slots; 5 - interdimensional; 6 - containers.

The method is as follows: when developing a coal deposit 1 with a retinue of adjoining seams 2 under conditions of a permafrost zone, during excavation of shallow and inclined deposits, the first treatment is carried out on the upper seam using a mechanized complex 3, the excavation machine of which is able to cut vertical slots 4 in the frozen rock mass interdomain 5. In this case, in the slots 4 form the tank 6 using the executive body of the extraction machine. Then the containers 6 are filled with hardly freezing liquids or solutions. Since cryolithozones enclosing frozen rocks have, as a rule, a temperature of from -1 ° C to -5 ° C, and hardly freezing liquids or solutions have a lower freezing temperature, the latter remain in containers in a liquid state for a long time. The distances between the slots 4 are chosen so that when excavating the underlying formation, the collapse of the rock blocks located between the slots 4 does not lead to a breakdown of the mechanized complex 3 and does not create emergency situations. The notch of the underlying formation begins after full or partial mining of the upper layer.

The advantages of the method are:

- extended scope of the method with the possibility of mining flat and inclined formations;

- eliminates the need for installation and freezing of thermal elements;

- the ability to save surfaces in the cut openings in a thawed state for a long time without disturbing the thermal balance of the workings;

- increases the safety of the excavation of the underlying reservoir, including reliable and safe operation of the mechanisms.

Information sources

1. USSR author's certificate No. 1204724, E 21 C 41/04, 1986

Claims (1)

The method of preparing the inter-layer in the development of adjacent coal seams of cryolithozone, including mining the upper seam with a face, cutting slots along the face, characterized in that when excavating shallow and inclined seams, the cut-through slots are made in the form of separate containers, the formed tanks are filled with hardly freezing liquids or solutions, and the distance between the slots is taken from the condition of safe collapse of the roof during the cleaning recess of the underlying formation.

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