The method of testing the security pillar of the group of mines on strong rockburst-hazardous seams

 

(57) Abstract:

The method of testing the security pillar of the group of mines on strong rockburst-hazardous formations. Before working their pillars are divided into operational areas, and protected production on marginal and Central. Of regional development and the other side of the Buryat shockproof relief well of large diameter. The number of unloading wells to increase the frequency at which the forces of rock pressure crush interwell spaces. Spend the collapse of the roof from the beginning of the operational area between the boundaries of pillars and boundary workings with the pitch interval of natural planting and between them begin the excavation of coal from the above-ground layer of the reservoir. At the same time it releases forces crushed rock pressure coal underlay layer and lead the subsequent collapse of the roof with a pitch interval of natural planting boundary between workings. 1 C.p, f-crystals, 2 Il.

The invention relates to the field proud of the case, namely to the extraction of pillars of coal left about a group of celestial workings for their support during operation.

The known method caving mezhdurebernyh pillars by follow the abode, beat the pillars deep wells, beat their explosion into the open stope and produce ore to transport produce, while Mezhdunarodnye entirely discourage plots first, on the border of the block adjacent to the ore passes, and in the same volume netbiter sites in the loosened condition, and then the remaining parts formed on the mined-out area with the formation of Nabal of broken ore along the production near the ore passes. The method allows to extract Mezhdunarodnye pillars left to support a goaf. However, when implementing this method pillars completely razvarivat for loosening explosive without using energy rock pressure. In addition, the consistent reduction of pillars without holding shockproof preventive measures increases the risk of upper punches. Therefore, the method for testing the security pillar about workings on rockburst-hazardous seams ineffective.

A known method of unloading the bed elevated stress by loosening and removing abandoned in the developed space narabatyvaem layers of pillars [2].

In this way the pillars are deficient in minerals, moreover, the minimum required amount of excavation calculated analytically. The method allows to partially extract the pillars left in the developed space narabatyvaem layers, however, the holding furnaces in the pillars increases the stress concentration on the areas of the reservoir between the furnaces, which causes the risk of manifestation of the heavenly blows. In addition, the holding furnace subject to additional heatrate, and the extraction of pillars accompanied by a loss of the reservoir. Therefore, the method for excavation about the security pillar workings on rockburst-hazardous seams ineffective.

The closest to the technical nature of the present method is a method of testing the security pillar workings of capital consistent preparation areas for the holding flank contouring workings adopted for the prototype [3].

According to this method, the contour of pillars are flanking generation, and the hollow pillars are consistently prepared plots parallel with the preparation of excavation works and its completion by the end of the notches on adjacent parcels, with flank contouring output prepared plot hold up under the face are one of them with the subsequent overload in capital production, while the front stope oriented at an acute angle to the direction of sewage extraction. The method allows to extract security pillars major celestial workings and redeem themselves develop. However, the contour of the flank openings and ventilation sbec entail additional costs. In addition, the holding contour workings near border pillars and the orientation of the stope at an acute angle to the direction of sewage extraction creates increased stress concentration at okonjoiweala areas of the reservoir that causes danger manifestations of rock bursts. Therefore, the method for testing the security pillar about a group of workings on rockburst-hazardous seams ineffective.

The objective of the invention is to provide a method preventing the high shock and reducing the cost of the hollow pillar due to combination of protipozarnich events with coal without additional mines and energy use rock pressure.

In accordance with the proposed method divides protected by pillars generation at the regional and Central and regional roadways throughout the length of the operational section alternately in one and drainy produce oil change on regional output, control the stress state of the coal in the inter-well spacing and increase the number reproach wells in the fans and in series to a frequency at which the forces of rock pressure crush interwell spacing, then from the beginning of the operational area between the boundaries of pillars and boundary workings spend the collapse of the roof with a pitch interval of natural planting and begin dredging coal between edge workings of the above-ground layer of the reservoir, simultaneously released on a crushed rock pressure forces the coal from interwell spaces underlay layer and lead the subsequent collapse of the roof with a pitch interval of natural landing between edge workings, then repeat the operation on the following operating area and in such sequence work security pillars over the whole length, with a well of large diameter in the direction of the boundary pillars Buryats fans in sectors at full capacity of the reservoir, and in the center they are drilling rows of intersecting underlay layer formation.

In Fig. 1 shows a diagram of the testing of the security pillar on two adjacent operating parts; Fig. 2 - section a-a in Fig. 1, which shows the drilling of fans and radany on strong rockburst-hazardous seam of coal, divided by its length in operational areas with boundaries 2, and protected a whole generation 1 - crime 3 Central 4, and begin a phased excavation of the pillar 1. From the marginal openings 3 along the entire length of the operational area to the edges of the pillar 1 drilling the fans 5 discharge wells of large diameter, which are placed in the sector on the whole capacity of the reservoir. Alternately with 5 fans with the same Parking drilling equipment in the direction of the center pillar 1 are drilling the same well by placing them in rows of 6, crossing the underlay layer 7 layer. From each drilled hole fans 5 and series 6 release oil change on regional generation 3. Control the stress state of the coal in the interwell between 8 and increase the number of wells in the fans 5 and series 6 to a frequency at which the forces of rock pressure crushes interwell spacing 8 until no visible cracks 9. From the beginning of the operational area over parts of the pillar 1, the paths of its boundaries and boundary workings 3, conduct the collapse of the roof with maintaining pitch interval of natural planting and successive filling the collapsed rocks 10 space from boundary pillar 1 to the marginal openings 3, and between them nackley forces of rock pressure coal from interwell spaces underlay layer 7 and lead the subsequent collapse of the roof with maintaining natural step landing between edge 3 and workings filling out space collapsed rocks 10. After the development treatment of dredging the above-ground layer 12 on the next operational area of the edge openings 3 again drilling the fans 5 and series 6 wells of large diameter, leave them at the regional generation 3 drilled coal, crushed rock pressure forces interwell spaces 8 and obresult between boundary pillars and boundary workings 3 roofs with a pitch interval of natural planting and filling out space collapsed rocks 10, and by stoping part of pillar 1 between edge 3 workings with the subsequent collapse of the roof in the pitch interval of natural planting begins after the end of the excavation above-ground layer 12 and forces crushed rock pressure of whoa underlay layer 7 with the subsequent collapse of the roof in the pitch interval of the natural landing on previous operational area. In this sequence are practicing security pillar 1 cilium length.

Working out the security pillar of the group of mines on strong rockburst-hazardous reservoirs is based on the prevention of rock bursts with a combination of shock events with the extraction of coal by drilling wells adenoma passport and energy use mountain press is indeed excavation and drilling operations, extraction of coal and roof, and the division of protected openings at the regional and Central without additional openings can cover the whole with the use of the protected openings with a combination of technological operations for preventive security measures and worthwhile stoping. Drilling fans unloading wells of large diameter from edge of excavations to the borders of pillars with frequency up crushing interwell spaces relieves the stress concentration in the boundary zones of pillars, prevents the formation of objects of rockbursts at their borders and prigruzhat interwell spacing in the Central part of the pillar. This sovmesheno with shockproof discharge drilling of the fans is provided by passing the coal production from the marginal zones of pillars at full capacity of the reservoir by issuing drilling detail on regional development and transportation.

Drilling rows of discharge wells in the Central part of the pillar also prevents the formation of foci upper shock in the underlay layer formation, combines the extraction of coal by drilling the relief from stress, provides crushing interwell spacing forces the mountain on the ary strain nudebody underlay layer. Conducted following excavation of coal systematic collapse of the roof rocks in the pitch interval of the natural landing first on marginal zones of pillars, and then over the Central area allows for a secure and technological development pillars linked by their seizure control roof. Early separation of the operations on adjacent parcels but the width of the pillar allows you to split their time and continuous testing of the security pillar of the entire length.

This embodiment of the method prevents the manifestation of rock bursts during the mining of pillars and reduces the cost of their seizure by combining shockproof activities mining of coal and by using the energy of rock pressure for crushing interwell spaces. For testing of pillars are themselves protected production, the cost of conducting flank contouring and ventilation openings and prevents stress concentration in the marginal and Central parts of pillars, precluding the formation of foci of rock bursts.

1. The method of testing the security pillar of the group of mines on strong rockburst-hazardous formations, including the division of pillars according to their length on exploitatio Revie and Central and regional roadways throughout the length of the operational section alternately in each of two sides of the Buryat shockproof relief well of large diameter, from each drilled wells produce oil change on regional production, control the stress state of the coal in the inter-well spacing and increase the amount of discharge of the wells to a frequency at which the forces of rock pressure crush interwell spacing, then from the beginning of the operational area between the boundaries of pillars and boundary workings spend the collapse of the roof with a pitch interval of natural planting and begin dredging coal between edge workings of the above-ground layer of the reservoir, simultaneously released on a crushed rock pressure forces the coal from interwell spaces underlay layer and lead the subsequent collapse of the roof with a pitch interval of natural landing between edge workings, then repeat the operation on the following operating area and in such sequence work security pillars over the whole length.

2. The method according to p. 1, characterized in that the wells of large diameter in the direction of the boundary pillars Buryats fans in sectors at full capacity of the reservoir, and in the center they are drilling rows of intersecting underlay layer formation.

 

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FIELD: mining industry.

SUBSTANCE: method includes driving of layer transporting and ventilation mines along soil and ceiling of bed, in massive and in extracted space, cutting of cleaning mines in cross-section of bed at angle of 27, mechanized delivery of coal along bed mines to coal furnaces and vertical dropping of coal to furnaces. Extraction of slanted transverse bed is performed along bed diagonals having direction to horizon at angle of 27, to provide for free sliding of coal without degradation. Delivery of coal from cleaning mine placed at angle of 60 to layer mine, to back field mine is performed by self-delivery from any place of extraction field along layer mine, field coal-lowering mine and field slanting coal furnace, being at angle of 27 to horizon. Field slanted coal furnaces are placed at distance from one another along 20 m normal. Field coal mines in form of fans of three mines are connected on field slanted coal furnaces at distance of fan start from one another of 60 m with output of mines ends to each layer mine of group of three above-lying slanted-transverse layers for whole diagonal length of extraction field at distance between mines outputs along layer soil of 60 m. Ceiling of cleaning mines may be supported without load, utilizing mechanical traction on the side of ventilation furnaces for pressing moveable support tool to layer ceiling.

EFFECT: higher efficiency.

2 cl, 3 dwg

FIELD: mining industry.

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EFFECT: higher efficiency, effectiveness, broader functional capabilities.

8 cl, 5 dwg

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EFFECT: higher precision, higher speed of operation.

2 cl, 3 dwg

FIELD: mining industry.

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EFFECT: higher efficiency.

2 dwg

FIELD: mining industry.

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EFFECT: higher intensiveness, higher reliability.

3 dwg

FIELD: mining industry.

SUBSTANCE: method includes preparation of slanted extraction fields, driving transport drifts, driving ventilation drifts for upper extraction field and use of transport drift of upper extraction field as ventilation during preparation of lower extraction field, driving two chambers through block in parallel to transport drift. Lower chamber is driven with advance relatively to transport drift and to upper chamber and with slant, providing for free flow of water from transport drift and both chambers. Transport drift is periodically filled with breakthroughs to upper chamber, which is by breakthroughs connected to lower chamber. Width of lower chamber is set in accordance to condition of placement of working tool of technological extraction complex therein, and width of upper chamber - from condition of placement of rock therein which is product from driving of transport drift. Transport drift and both chambers are driven with straight preparation and extraction order of extraction fields, using solid system of extraction fields extraction.

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3 dwg

FIELD: mining industry.

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EFFECT: higher efficiency and higher safety.

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FIELD: mining industry.

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EFFECT: higher efficiency.

1 dwg

FIELD: mining industry.

SUBSTANCE: method includes separating bed on levels by driving level drifts, driving sublevel drifts, separating levels on sublevels, extraction of mineral resource in sublevels by hydraulic monitors, transporting caved-in enveloping rocks to extracted space of lower sublevels. Extraction of bed is performed without leaving of any coal blocks between extracted spaces of adjacent levels. During extraction of lower sublevel, adjacent to upper boundary of even lower level, extracted space is filled within limits of current sublevel with empty rocks, while slanting height of backfill massif is taken to be greater than 0.6 horizontal bed massiveness. Slanting height of lower sublevel is taken to be greater than slanting height of backfill massif.

EFFECT: higher personnel safety, higher efficiency, lower costs.

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FIELD: mining industry.

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