RU2467169C1 - Method of sublevel working of steep seams with sandstowing - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention relates to mining, particularly, to sublevel working with sandstowing. Proposed method comprises working the block by odd and even sublevels in ascending order by counter short mining faces vented by all-mine drawdown. First, subdrifts and drops are worked. Seam is worked by counter short mining faces from flank slopes to central slope with direct-flow venting in advance preparation and working of odd sublevels. Mined-out area is filled with solid stowing while even sublevels between odd mined-out sublevels are filled with common stowing. In working, former vent heading is used as a belt heading.

EFFECT: higher safety and efficiency.

3 dwg

Description

The invention relates to the mining industry and can be used in the development of steep formations with the laying of the developed space.

There is a method of mining steep seams with inclined layers with a recess in ascending order by strips along the strike with hydraulic laying of the worked-out space (A.P. Kilyachkov. Mining technology. M: Nedra, 1985, 259-363). Coal is mined using blasting. The face is a lava (strip) 10-15 m long, located in the fall. In the lava, the usual bottomhole support is installed, then a hydraulic tab is fed into the worked out space.

The main disadvantages of this technology include the fact that when the working face is combined with a ventilation drift, dangerous working conditions are created (a large accumulation of methane and the formation of coal dumps).

These disadvantages are eliminated in the other closest to the claimed method (Patent for the invention No. 2283431; application 04/28/05; publ. 09/10/06, BIP No. 25). Coal mining is carried out here by mechanized and hydraulic methods with gravity and cast hardening laying of the worked out space.

The disadvantages of the technology are as follows:

complex ventilation of the faces; a large amount of preparatory work; low concentration of mining in the prepared excavation site; low quality of mineral due to hydraulic breakdown of coal.

The objective of the invention is the creation of such a method of developing a steep formation, which improves the working conditions of miners, improves safety and productivity, reduces the complexity and cost of coal.

In the method of subsurface development of steep seams with laying out the mined-out space, including working out the excavation section with even and odd sub-floors in ascending order with short short working faces ventilated due to common shaft depression, as well as preliminary conducting under-floor drifts and slopes, working out the formation by oncoming short working faces from the flank slopes to the central with airing according to the direct-flow scheme and advanced preparation and mining of odd floors, worked out The left space of which is filled with a hardening bookmark, and in the even even floors that are left between the worked odd ones, the worked out space is filled with the usual bookmark, and when they are worked out, the former ventilation drift of the odd sub-floor is used as a conveyor.

The method is illustrated by drawings, where in Fig.1 shows a diagram of the preparation and development of the excavation site with the placement of the working faces and preparatory workings; figure 2 is a section I-I in figure 1; figure 3 is a section II-II in figure 1.

Figure 1-3 shows a flow chart of coal mining oncoming treatment faces with separate ventilation and laying of the mined-out space.

The excavation section on the ventilation and drainage horizons is opened with crosshairs 1, 2, 3, 4, 5, 6. Then flank slopes 7, 8 and the central slope 9 are carried out. Next, the ventilation 10 and recoil 11 drifts are carried out.

To work off the first odd sub-floor 12, conduct a ventilation drift 13. To work off the second odd sub-floor 14, conduct a conveyor 15 and ventilation 16 drifts. To work out the third odd sub-floor 17, conveyor 18 and ventilation 19 drifts are also carried out.

When practicing the first even substage 20, the former ventilation drift 13 is used as a conveyor drift, and when practicing the second even substage 21, the former ventilation drift 16 is used and when practicing the third even substage 22, the drift 19 is used.

The worked out space of the odd subfloors is laid by the hardening tab, and the even - usual. To maintain the central slope, the rear sight 23 is left.

When mining even floors, the ventilation drift 24 is constructed and stored until the underground floor 20 is completely worked out, and then it is filled with a hardening tab. The flank slopes 7, 8 are filled with a bookmark as even sub-floors 20, 21, 22 are worked out, and the central 9 after the site has been completely worked out.

A method of developing a steep formation is as follows.

Prior to the start of cleaning work, flank slopes 7, 8 and central slope 9 are carried out from cross-hoses 1, 2, 3, 4, 5, 6. Then the main drift 11 and the ventilation drift 13 are worked out to work out the odd subfloor 12. The odd subfloor is worked off from the flank slopes 7, 8 to the central 9, leaving the ventilation drift 13. At the same time, the preparation and development of the following odd floors 14, 17 is underway. As they are being worked out, the development of even floors 2, 21, 22 begins.

When working out even floors, the former ventilation drifts of the odd floors 13, 16, 19 are used as conveyor drifts, and the ventilation drifts 24, 25 are constructed in the filling array.

All treatment faces are ventilated due to common shaft depression according to the direct-flow scheme, and the odd sub-floors additionally use a refreshing stream of air.

Fresh air during the development of even subfloors comes from the main horizon to the central slope 9, and then to the conveyor drifts and, having washed the face, goes to the ventilation drifts 24, 25 temporarily left in the worked-out space. From the ventilation drifts, the outgoing air stream along the flank slopes 7, 8 goes to the ventilation horizon.

The ventilation drifts 24, 25 of even floors 20, 21 are filled with a hardening tab after the completion of the sub-floor, and flank slopes 7, 8 are also filled with the tab here.

To preserve the central slope 9, the pillars of coal 23 are left. A non-target strip mining scheme, known by the existing technology, is possible, where the coal slope is erected in a filling array.

Claims (1)

The method of under-floor development of steep seams with laying out the mined-out space, including working out of the excavation site with even and odd sub-floors in ascending order by short short faces, aired by common shaft depression, as well as preliminary conducting under-floor drifts and slopes, characterized in that the working out of the layer is performed by oncoming short working faces from the flank slopes to the central slope with airing according to the direct-flow scheme and advanced preparation, and working out odd detazhey, goaf fill a hardening bookmark, and even leave-substage between exhaust odd, goaf filled conventional bookmark, wherein when working out the former airway odd substage is used as the conveyor.

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