RU2312218C2 - Combined development method for flat-laying seams of coal field - Google Patents

Abstract

FIELD: mining, particularly methods of underground or surface mining.

SUBSTANCE: method involves sinking underground entries to underground seam part along with seam drilling-out after surface drilling work stopping; leaving barrier pillar; performing developing entries and preparatory workings for underground seam cutting. Production works are carried out after or simultaneously with seam drilling out from surface.

EFFECT: possibility to extract coal beyond drilled-out section.

2 dwg

Description

The invention relates to the mining industry and can be used in the combined development of shallow seams of coal deposits.

A known method of combined development of reservoir deposits, including conducting opencast mining, underground mining and mining operations underground [1].

The disadvantage of this method is that mining from the underground mining site can be carried out only after the complete completion of open mining and filling the ventilation drift with empty rocks.

A well-known technology for the deep development of coal seams, including the extraction of coal by the complex both from the exits of the coal seams to the surface, and after the extraction of coal by opencast mining, which consists in conducting a series of parallel workings (chambers) to a depth of 300 m [2] is a prototype.

The main disadvantage of this technology is that it excludes the possibility of coal mining outside the recoverable area.

The technical problem was the need to develop a method for extracting coal reserves located outside the drilling area.

The proposed method is characterized in that after stopping the open cast mining and simultaneously drilling the formation from the stopped open cast mining, open underground mine workings are carried out in the place chosen by the project in the underground section of the formation located below (further) the section allotted for drilling the formation, leaving the entire barrier between these sections, then preparatory and rifting workings are carried out for underground excavation of the formation, and mining operations are carried out after drilling the formation from the surface or simultaneously to drill out.

The essential feature introduced into the formula is that after stopping opencast mining, simultaneously with the drilling of the formation, excavating underground mine workings are conducted to the underground section of the formation, it makes it possible to timely prepare this section for treatment excavation and to eliminate the time gap after the completion of excavation by drilling.

An essential feature is that a barrier pillar is left between the area intended for drilling the formation from the surface and the area for underground mining, provides independent mining of these areas, prevents the underground mining section from breaking through if flooded chambers are flooded in the overlying section .

An essential sign that mining operations in the underground section are carried out after drilling the formation from the surface or at the same time as drilling, eliminating the time lag in coal production after drilling the formation or even increasing the production capacity of the enterprise while simultaneously extracting coal from two sections.

The essence of the method is illustrated by drawings, where Fig. 1 shows in plan a section for open cast mining, drilling a formation and underground mining, in Fig. 2 - section AA in Fig. 1.

Symbols adopted in the drawings:

1 - coal seam; 2 - the boundary between open and underground mining; 3 - site for open cast mining; 4 - plot for drilling a coal seam; 5 - opening workings; 6 - site for underground mining; 7 - conveyor drift; 8 - ventilation drift; 9 - barrier coal pillar; 10 - mounting chamber; 11 - treatment plant.

The method is as follows.

On the coal seam deposit 1 of a shallow bed, the boundary 2 is first determined between open pit mining and underground mining. When conducting mining operations in the allotted area 3 for open work, overburden is removed to an external dump and expose the soil of the formation. Then, from the exposed space, work is underway on drilling the formation 1 in the area 4 intended for this purpose. Along with the drilling operations, openings 5 are being conducted to section 6 intended for underground mining. From the openings 5 lead preparatory workings: conveyor drift 7 and ventilation drift 8. In this case, between the ventilation drift 8 and section 4 leave the rear pillar 9, eliminating breakthroughs of water, pulp, air from section 4. In the mounting chamber 10, the treatment plant 11 is mounted. Treatment work in the prepared lava is carried out after completion of drilling of the formation in section 4 or simultaneously with drilling. In this case, it is possible to increase the production capacity of a coal enterprise.

The advantages of the proposed method are:

- ensuring the completeness of the extraction of the coal seam in the field due to the timely preparation of the site intended for underground mining;

- elimination of the time gap in coal extraction during drilling and mining operations at the underground mining site.

Information sources

1. RF patent No. 2194858, cl. 7 E21C 41/00, 2002

2. The Coal Magazine, No. 2, 2005, pp. 9-10.

Claims (1)

A method for the combined development of shallow seams of coal deposits, including open pit mining, drilling of a seam according to the technology of deep mining of coal seams after the cessation of open pit mining, underground mining, characterized in that after the cessation of open pit mining and simultaneously with the drilling of the pit from stopped open pits mining operations are carried out in the place chosen by the project, revealing underground mine workings to the underground section of the reservoir, located below the section allocated To drill the formation, leave the entire barrier between these areas, then carry out preparatory and rifting workings for underground excavation of the formation, and mining operations are carried out after drilling the formation from the surface or simultaneously with drilling.

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