Guarding method for district development drift

FIELD: mining.

SUBSTANCE: invention concerns mining and can be used at stratum development of minerals with swelled ground rock for guarding of district development drifts. Guarding method includes implementation of district development drifts 1, fixing of district development drifts, stratum weakening of minerals be making grooves 2,3. Powers of swelling layers of minerals stratum are defined. Stratum weakening is implemented by creating of vertical rooves 2,3 in sole, in the immediate vicinity of wall of working, from side of gradient and pitch of seam, at that groove length from side of gradient 2 is accepted as equal to maximal power of swelling stratum, but not more then 2000 mm, and groove length from the side of seam pitch 3 is equal to minimal power of swelling stratum.

EFFECT: decreasing of swelling of soil rocks, decreasing of costs for supporting district development drafts, increasing of spatial work concentration, providing of easier method of groove implementation.

1 dwg

 

The invention relates to the mining industry and can be used in the development of flat layers of minerals.

There is a method of protection of development workings in underground reservoir minerals (Hugin UL, Ustinov, M.I., Brayzev AV and other Beztselikovuju the seam. M.: Nedra, 1983, p.61), including precinct development workings, development and testing of formation of minerals by means of longwall mining without leaving pillars of minerals between the pillars and the protection of the mines on the border with goaf fires of roundwood. The disadvantage of this method are significant costs to maintain precinct development workings.

Closest to the claimed method according to the achieved result and the physical entity is the method according to the patent of Russian Federation №2134786, IPC IS 41/18.

This method includes the conduct of precinct development workings, contouring pillars of minerals, and the mining of pillars of minerals by means of longwall mining, with a minimum advance of the longwall face produce a weakening of the formation of minerals in the side sections of preparatory development by creating cracks in them drilling in the reservoir wells or blowing in the reservoir kamuf is to maintain charges. However, this method does not provide the maximum reduction of stress concentration in the array with pokaski rocks soil, so as not preclude the tangential displacements in the soil yields which have a major impact on the loss of stability of soil excavation.

The technical result is to eliminate this drawback, namely the reduction of stress concentrations in the array with pokaski rocks and soil, respectively, to decrease the costs of maintaining precinct development workings.

The technical result is achieved by the means of the protection of precinct development workings, including precinct development workings, mount precinct development workings, the weakening of the layer mineral holding slots, according to the invention determine the power luchshih layers of a layer mineral, the weakening of the reservoir is realized by the creation of vertical cracks in the soil develop, in close proximity to the sides of excavations, from the fall and revolt of the reservoir, while the length of the slit from the fall of the reservoir is equal to the maximum power luchshego layer, but not more than 2000 mm, and the length of the slit from the side of the uprising of the reservoir is equal to the minimum power luchshego layer.

Method of protecting precinct preparatory draw is to the illustrated drawings, where presented:

1 - precinct preparatory development;

2 - the crack from the fall of the reservoir;

3 - the crack from the uprising of the reservoir;

4 - soil under development.

The method is as follows. Define power luchshih layers of the formation of minerals. The process of conducting cracks should be included in a continuous cycle. Immediately after carrying out preparatory development of the precinct 1 (preferably before installing a permanent lining) in the soil under the precinct preparatory output 1 electric machine or gap making a barbell spend a vertical slot 2 from the drop of the reservoir, since the stress concentration from the fall of the layer is 1.2 to 1.9 times greater than that of the revolt of the reservoir. The slit 2 is performed on the maximum approximation to the side framing of length equal to the maximum power luchshego layer, but not more than 2000 mm, the Holding slots of greater length does not make sense, as the maximum tangential displacement occur at a depth equal to 1000-1500 mm Width slit accept 200-250 mm

After conducting a slit from the side of the drop formation spend a vertical slit 3, the uprising of the reservoir. Slot 3 also hold for the maximum approximation to the side of the precinct preparatory development 1 length equal to the minimum power luchshego layer, and a width equal to the width of the slot 2 with the part falls reservoir - 200-500 mm After the weakening of the formation of minerals on the entire length of the preparatory development of the precinct 1 produce the notch fossil.

Thus, when using the proposed method of protection precinct development workings achieved maximum reduction of stress concentration in the array (in the calculations (finite element method), decreases the displacement of rocks, soil, increased spatial concentration of jobs, reduced maintenance costs precinct development workings.

Method of protection of precinct development workings, including precinct development workings, mount precinct development workings, the weakening of the layer mineral holding slots, wherein the determined power luchshih layers of a layer mineral, the weakening of the reservoir is realized by the creation of vertical cracks in the soil develop, in close proximity to the sides of excavations, from the fall and revolt of the reservoir, while the length of the slit from the fall of the reservoir is equal to the maximum power luchshego layer, but not more than 2000 mm, and the length of the slit from the side of the uprising of the reservoir is equal to the minimum power luchshego layer.



 

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FIELD: mining.

SUBSTANCE: invention concerns mining and can be applied in protection of surface and/or underground objects against undermining. The method involves defining the border 4 of the protected zone (PZ) 5 of object 2 in the form of geometrical position of the points located at distance equal to the width b of safety berm from outline 3 of object 2 and at distance of ri and rj along the given radius-vectors and from the central point O fixed within the border 4. The radius-vectors cross vertical axis (VA) passing through the given central point O. Then a side surface (SS) of the protected zone (PZ) 8 is formed by generating lines (GL) 9 oriented along the mentioned radius-vectors and and drawn from the border 4 under the displacement angles of alluvium (AS) 10 and parent rock (PRS) 13 solids, defined for each direction of and . Further from a crossing line of the SS with roof (RS) 13 and ground (GS) 15 surfaces of a mineral deposit (MD) 6 borders 16 and 17 of the protection pillar (PP) are defined against the mentioned RS and GS in the form of a geometrical position of the points located at distances and along and directions from the VA to the border 16 and at distances and to the border 17, while the values of these distances are defined by the functional dependencies with account to displacement angles of AS and PRS, dip angles MD RS and GS and the ground surface of AS, distances ri and rj from the VA to the border 4 at the respective directions, depth of MD RS and GS occurrence, alluvium thickness under the PZ and VA plane, height marks difference at the PZ base (or day surface) in the central point O on the VA and on points i and j where respective radius-vectors and cross border 3. Functional dependencies are defined according to the geometrical constructions and have the one form for PP area 1 at the downslope of the MD 6 strike line (SL) 7 crossing VA, and another form for the upslope area of SL 7.

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4 dwg, 2 ex, 1 tbl

FIELD: mining.

SUBSTANCE: invention relates to geotechnology and can be used in subterranean leaching the metals and ores, particularly to preparing ore bodies in deposit for leaching. The method includes the explosive loosening the ore deposits and supplying the process liquor. Explosion of the blast hole rings (11) is performed to shake the central solid of the ore body, and in the upper ore body, the peripheral perforations with branching cracks (10) are formed by pin-point explosion, to inject solutions.

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1 dwg

FIELD: mining engineering.

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EFFECT: costs decreasing connected with accomplishing of assembling-dismantling works, as well as a time cutting of their accomplishing and safety improving.

3 dwg

FIELD: mining engineering.

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EFFECT: costs decreasing connected with accomplishing of assembling-dismantling works, as well as a time cutting of their accomplishing and safety improving.

1 dwg

FIELD: mining industry.

SUBSTANCE: invention relates to mining industry and may be used when mining potassium and coal beds with hard-caving roof, in particular, during mineral selective mining with partial stowing of worked-out area. The method to control hard-caving roof implies leaving of pillars, partial stowing of worked-out area with side and central packs from boundary and stowing (airway) entries of the face. Additionally, mineral is recovered from pillars and resulting space is gobbed, width h of additional mining being determined according to formula m, where L - length of place, m. The invention provides for increase in mineral recovery ratio by 15-30%, less amount of drivage, and roof caving control during working face travel, i.e. roof-caving increment being constant, with no adverse effect on the face operation.

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1 dwg

FIELD: methods of underground mining, particularly to prepare permafrost roof rock for initial caving.

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3 dwg

FIELD: mining, particularly methods of underground or surface mining.

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2 dwg

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8 dwg

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6 dwg

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1 dwg

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2 cl, 1 dwg

FIELD: mining industry.

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3 cl, 1 dwg, 1 ex

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2 dwg

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2 dwg

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2 dwg

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

2 dwg

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