Method to control hard roof under conditions of cryolithic zone

FIELD: mining.

SUBSTANCE: method includes development of reserves from a border of an extraction column, drilling from surface of wells into the extraction column and primary setting of the roof. Wells are drilled to the rated line of the roof arch in one row in parallel to a stoping face in the middle part of the limit span of the main roof slab. Eutectic-hard-freezing solutions are filled into wells for the height of 1.5-2 m, rated time is maintained, which is required for melting of ice in cracks of roof rocks and formation of germinal slots, afterwards the wells are filled to the surface with the same solutions, and a hydraulic rupture is carried out in a rock massif.

EFFECT: invention makes it possible to ensure controlled primary setting of strong cracked rocks.

2 dwg

 

The invention relates to mining and can be used to control difficult-to-collapse roof in the development of mineral deposits located in the permafrost zone.

Known way to control difficult-to-collapse roof in permafrost, including the development of mineral resources from the border post excavation and initial planting of roof rock after drilling wells and making them free of cavities [1] the prototype.

The main disadvantage of this method is that it can be used only for weak, crumbling after defrost, the sandstones.

The technical challenge was to develop a way to provide managed primary landing strong fractured rocks, cemented by ice in the cracks in permafrost conditions.

This object is achieved in that the wells are drilled to the estimated lines of code caving in one row parallel Oistamo slaughter in the middle part of the marginal flight plate of the main roof, poured into wells eutectic (trudnosgoraemye) solutions at a height of 1.5-2 m, can withstand the estimated time required to defrost the ice in the cracks of the roof rocks and formation of germ slits, then fill the wells up to the surface of the same solutions and produce GI is rotatrim in the rocks.

Introduced in the formula of the invention, a significant sign that wells are drilled to the estimated lines of code collapse, provides a bundle of roof rocks in this area boundaries and creates the necessary conditions for the initial planting of the roof.

A significant sign that wells are drilled in a row in the middle part of the marginal flight plate of the main roof, allows for the stratification of the rocks of the roof parallel to Oistamo slaughtering the entire width of the extraction column.

A significant characteristic that is poured into the wells eutectic (trudnosgoraemye) solutions at a height of 1.5-2.0 m, allows you to create a germ slit in the desired location.

The next significant feature that can withstand the estimated time to defrost the ice in the cracks of the roof rocks and formation of germ slits needed to create gaps of sufficient length.

A significant characteristic that then fill the well to the surface of the same solutions and produce a fracture in the rock, leads to the formation of cracks large extent along the line of the arch collapse and filling them with solutions that exclude them from freezing.

The way to control difficult-to-collapse roof is illustrated by drawings, where figure 1 shows a section of the site excavation column along the row of wells, figure 2 - the image is of embryonic cracks in the well.

Conventions on the drawings:

1 - coal mine; 2 - hole; 3 - longwall face; 4 - current line; 5 - arch collapse; 6 - crack; 7 - powered system.

Given that trudnoperevarimoy fractured rocks of the roof is connected with the fact that the rocks cemented by ice in the cracks, the method is based on the process of thawing of ice in the cracks, creating embryonic cracks and subsequent fracturing of the rocks.

The method is as follows: planned and prepared for excavation excavation posted on coal Deposit 1 drilling the number of wells 2, placing it in parallel Oistamo the bottom 3 in the middle part of the marginal flight plate of the main roof. Well 2 Buryat only to the check line 4 arch collapse 5. The wells are then 2 fill eutectic (trudnosgoraemye) solutions at a height of 1.5-2 m and can withstand up until the ice in the cracks of 6 to thaw and will not appear germ slit. After that, well 2 fill completely eutectic solutions and produce fracturing of the rock mass. When stoping coal and pass mechanized complex 7 under the wells 2 is the collapse of the roof rock blocks, no longer bound to each other by layers of ice.

The method allows to control the primary landing frozen trudnoca the mined rocks.

The source of information

1. RF patent №2237809, 7 E21C 41/16, 2004

The way to control difficult-to-collapse roof in the permafrost zone, which includes mining stocks from the border post excavation, drilling from the surface of the wells in the extraction column, the primary landing roof, characterized in that the wells are drilled to the estimated lines of code caving in one row parallel Oistamo slaughter in the middle part of the marginal flight plate of the main roof, poured into wells of eutectic - trudnosgoraemye solutions at a height of 1.5-2 m, can withstand the estimated time required to defrost the ice in the cracks of the roof rocks and formation of germ slits, then fill the wells up to the surface of the same solutions and produce a fracture in a rock rocks.



 

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The invention relates to mining and can be used for crack formation in the wells with the aim of separating blocks from arrays, extraction of valuable crystalline raw materials and building stone

The invention relates to mining and can be used for crack formation in the wells with the aim of separating blocks from arrays, extraction of valuable crystalline raw materials and building stone

FIELD: mining industry.

SUBSTANCE: device has hollow cylindrical body with radial apertures and ring-shaped shelves at the ends and self-compacting collars. These are mounted on opposite ends of body and are adjacent by bases to its ring-shaped shelves. On the latter barrels are fitted with central apertures in bases. Through barrels and body a pipe is let with possible longitudinal displacement relatively to body, having radial apertures, ring-shaped shelf at one end and outer thread at other end. Pipe is pressurized on the side of ring-shaped shelf, its radial apertures are in zone of radial apertures of body, one barrel is stopped against ring-shaped shelf of pipe, and other barrel is connected to pipe by threaded connection.

EFFECT: higher efficiency.

1 dwg

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