RU2283431C1 - Method for thick steep mineral seam mining along with goaf filling - Google Patents

Abstract

FIELD: methods of underground mining, particularly for brown or hard coal mining along with goaf filling.

SUBSTANCE: method involves cutting horizontal layers in strips along the strike by mechanical hydraulic breaking thereof along with rock mass transportation and cuts filling with poured hardening filler, wherein holes for following combined filler supply into goaf are left in the cuts. The seam is cut in strips in descending order so that drifts and chambers are left in underlaying strips. Next strip is cut by hydraulic monitor. Rock from hopper is moved by conveyer out of flexible roof into goaf and impregnated with poured hardening filler during preparation mine filling.

EFFECT: reduced labor inputs and increased safety.

6 dwg

Description

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

There is a method of mining steep layers in horizontal layers in the fall with a hardening tab (A.P. Kilyachkov. Mining technology. M: Nedra, 1985, p. 265-267). The extraction of the layers is carried out by short mechanized approaches with a cast hardening tab. The landings are given a slope of 3-5 ° from the slopes into the site, which ensures the spreading of the cast hardening mixture by gravity along the soil without stratification over a length of more than 100 m.

The disadvantages of this technology include the fact that coal transportation is complex and unproductive. Also low productivity of sewage treatment. An expensive hardening bookmark is required.

The closest is the method of developing a powerful steep layer of minerals with the laying of the developed space (AS USSR. No. 1472673; declared. 11.06.86; publ. 15.04.89 Bul. No. 14).

The chambers are excavated here through one with the subsequent extraction of the pillars, while the excavation drifts in each chamber are connected by inclined faults, and the mineral is destroyed by hydraulic breakdown from the middle excavated drift with the repayment of the inclined faults.

The disadvantages of the technology are as follows: with an unstable roof, the installation layer must be worked out; unsafe working conditions; installing flexible floors in each chamber is very difficult; a large amount of preparatory work before the start of coal extraction in the chamber; to prevent the erosion of the chambers by a high-pressure jet of water, special measures are required to ensure the stability of the walls.

The objective of the invention is to reduce the complexity and increase the safety of mining.

In a method for developing a powerful steep mineral stratum with laying out a mined-out space, including working out a horizontal layer with strips along a strike by mechano-hydraulic breaking and transporting rock mass with filling castings with a cast hardening bookmark and leaving workings in them for subsequent feeding into the worked-out space a combined bookmark, according to the invention, working out the formation is led by strips in a descending order, with the drift and furnaces remaining in the underlying strips, jetting the next band is performed, and for flexible overlap in goaf from the hopper is fed by conveyor breed which is impregnated with a hardening cast tab when completing preparatory workings.

Preparation of the formation begins with field drifts on the ventilation and retreat horizons. Cross drifts are carried out from drifts to the reservoir. Slopes are held along the boundaries of the excavation field. The development of the reservoir is carried out in descending order by strips along strike.

The first strip is worked out mechanohydraulically in separate passes with the laying of the worked-out space with a cast hardening mixture. Then the second lane is worked out with the drift left in the stowage array. After that, the third strip is worked out, and the furnaces are left in it for feeding gravity bookmarks into the worked out space.

The worked out space is formed as a result of excavation of the underlying strip by the hydraulic monitor and the passage of a flexible overlap layer onto the soil. Further, all the preparatory workings and the worked out space are filled with a cast hardening bookmark.

Figure 1 shows a diagram of the preparation and development of the excavation field with the placement of the worked strips and preparatory workings; figure 2 is a section aa in figure 1; figure 3 is a section bB in figure 1; figure 4 is a diagram of the preparation and development of the excavation field with the placement in it of worked out underlying bands; figure 5 is a section bb in figure 4; Fig.6 is a diagram of the face with the tab of the worked out space.

Figure 1-6 shows: cross-sleeves 1, 2, 3, 4, passed from field drifts 5, 6, to prepare the excavation field; coal discharge 7 and cargo ramp 8; a hopper 9 for placing the rock from the sinking of the preparatory workings; spent strip 10 filled with cast hardening tab; the next strip 11 worked out by sunset with the drift 12 left in the filling array; a conveyor 13 for transportation from the rock hopper 9 to the mined-out space 14; band 15 worked out by sunset with the furnaces 16 left in the filling array; a hydraulic monitor 17 for working out the strip 18 with the bypass of the flexible floor 19, previously laid on the soil of the overlying strip; furnace 20 for the entry of an outgoing stream of air into the ventilation horizon; jumpers 21, installed before the filing of the cast hardening bookmarks in the fulfilled entries; stowage array 22 for maintaining a cargo ramp; 23 sub-floor drift for coal mining with a hydraulic monitor.

The method is as follows. Prior to the start of treatment work from field drifts 5, 6, local cross-hoses 1, 2, 3, 4, as well as cargo 8 and coal-slope 7 ramps are carried out. Then begins the development of the strip 10 mechanohydraulically by means of stops with filling the worked out space with a cast hardening tab. After that, the following strip 11 is worked out by sunset, with the drift 12 left in the stowing array. The underlying strip 15 is also worked out by the stops, but with the furnaces 16 left in the stowing array and the flexible floor layer 19 is laid on the soil.

At a distance of 10-12 m from the flexible overlap, a sub-floor drift 23 is carried out and from the slope previously contoured by the filling array 22, coal extraction by a hydraulic monitor 17 of strip 18 begins, with coal transporting by gravity to the coal slope 7. As the strip is drilled out of the left drift 12 using a conveyor 13 from the hopper 9 through the furnace 16 into the excavated space 14 is fed a gravity filling (rock from the preparatory workings). In this case, a flexible overlap separates the worked out space from the treatment room.

After working off the strip and installing jumpers 21 from the ventilation horizon, slope 8 is fed into the drift 12 cast hardening tab. The bookmark fills the drift 12 and through the left furnace 16 enters the worked-out space 14, previously filled with a gravity-filled bookmark. A gravity bookmark is impregnated with a cast hardening bookmark, forming a stable array.

Ventilation of working faces is carried out due to mine depression. Fresh air enters from the main horizon through ramp 7 and then goes to the sub-floor drift 28. Then, through the furnaces spent in the coal mass 20 and the filling array 16, the exhaust air goes to the drift 12 left in the filling array, and then goes to the flank cargo ramp 8 and ventilation horizon.

Similarly, coal is mined and the developed space is laid in the underlying stripes.

Claims (1)

A method for developing a powerful steep mineral stratum with laying of mined-out space, including working out a horizontal layer with strips along the strike by mechanohydraulic breaking and transporting the rock mass with filling castings with a cast hardening tab and leaving workings in them for subsequent feeding into the worked-out space a combined bookmark, characterized in that the formation is led in strips in a descending order, with the drift and furnaces remaining in the underlying strips, and working off the traveling strip is carried out with a hydraulic monitor, and for flexible overlap, a rock is fed into the mined space from the hopper using a conveyor, which is impregnated with a cast hardening tab when filling the preparatory workings.

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