RU2042815C1 - Method for mining steeply dipping and inclined coal seams - Google Patents

Abstract

FIELD: mining industry. SUBSTANCE: method for mining steeply dipping and inclined coal seams includes development operations by long-pillar system to the strike with coal strip winning to the top. Coal is won in strip by benches with application of drilling and blasting operations from raises. Coal winning in benches is carried out with leading the benches which are close to strip caved part; erected in the last raise of the strip (adjacent to newly developed strip) is cutting-off support. Strip width is determined empirically depending on breaking of coal by drilling and blasting. EFFECT: higher efficiency. 4 dwg

Description

 The invention relates to the mining industry, specifically to the excavation of steep and inclined coal seams with long columns along strike with coal excavation in strips along the uprising.

There is a method of developing steep and inclined coal seams with long posts along the strike, including conducting a drift, dividing the seam into strips with the erection of body support at the border of the strips, drilling and blasting, excavation of coal in strips for rebellion [1]
The disadvantage of this method of developing steep and inclined coal seams is that it does not adequately ensure the safety of work and the effectiveness of ventilation.

 The aim of the invention is to remedy the noted drawbacks, which is achieved by the fact that with the technology of developing steep and inclined coal seams with long posts along a strike, including conducting a drift, dividing the seam into strips with the erection of body support at the border of each stripe, drilling and blasting coal in strips for rebellion , in the latter, they carry out uprising workings, the ventilation drift is strengthened by monolinging its lining with the host rocks, while drilling and blasting operations are carried out They are extracted from the rising workings, and coal mining in the uprising strip is carried out simultaneously by several ledges, ahead of the coal mining from the ledges located closer to the dam part of the strip.

 Figure 1 shows the technological scheme of mining steeply inclined formation of the proposed method; in Fig.2 the same, within one sub-floor; figure 3 section aa in figure 2; figure 4 section BB in figure 2.

 A steep coal seam (excavation field, block, section) according to the proposed technology is prepared by a ventilation drift 1 and a retraction (not shown in the drawings). The floor is divided into several sub-floors (3-4) by intermediate (sub-floor) drifts 2,3, parallel to which drifts 4,5 are located, located 3 m higher. Drifts 2,3 and drifts 4,5 are connected by failures 6.

 Each sub-floor is divided into several excavation strips, the parameters of which (height and width) are determined by the value of the stable span of the formation roof, determined each time empirically. In the contour of each excavation strip within the sub-floor, rebellious workings 7 are made, which are a well, a furnace, a cut workout, etc. The number of workings 7 in the excavation strip is determined by the parameters of drilling and blasting operations, providing the necessary crushing of coal.

 Coal mining in the strip is carried out simultaneously by several ledges 8.9 and 10 from the rising workings 7. Moreover, ledges 8 and 9, located closer to the dam part of the strip (excavation section of the seam), are mined ahead: ledge 8 is ahead of ledge 9, and ledge 9 ahead of ledge 10. In the last uprising excavation 7, bordering a new strip being prepared for excavation, an erected roof support 11 is erected in the form of an organ row of wooden racks. The extraction of coal in the strip is, as a rule, until the exposed organ row of the lining is exposed.

 The fastening of the ventilation openings (pins 1 and 2) before the start of cleaning work on the next strip section is enhanced (monolithic with the host rocks), for example, by erecting an additional anchor support, filing the frame of the roof support to the host rocks of the formation.

 Preparation of excavation strips is as follows. Wells with a diameter of 500 mm are drilled from sub-floor drifts 2 and 3 through a drilling machine 6 meters apart from each other along the strike of the formation, which, with some lag, are expanded by a 12 mm PKZh 4-1M tunneling machine to a square section of 1.5 x 1.5 m or whatever or others of similar purpose. With a stable, strong corner, the ovens are fastened with wooden racks in a ravine (to the corral under the top), which ensures safer working conditions.

 Drilling holes from the furnace is carried out on both sides of the formation by fans located in normal planes to the formation, and blasting of hole charges is carried out in series using electric detonators with a millisecond slowdown.

Claims (1)

 METHOD FOR DEVELOPING STEEL AND INCLINED COAL LAYERS with long posts along the strike, including conducting a drift, dividing the formation into strips with erecting an organ support at the border of the strips, drilling and blasting coal excavation in strips along the uprising, characterized in that the rebound reinforcing workings are carried out in the strips, by monolinging its lining with the host rocks, while drilling and blasting operations are carried out from the rebellious workings, and several coal are excavated in the strip along the uprising small ledges ahead of the extraction of coal from the ledges located closer to the dam part of the strip.

Images