The method of development of ore bodies chamber systems with weak pillars

 

(57) Abstract:

The invention relates to the mining industry and can be used in the development of underground ore bodies storey-chamber systems. The essence of the method lies in the fact that during the development of the ore bodies of the chamber systems with weak pillars cutting a slit in the next (adjacent) the camera is doing to create flexibility mezhdunarodnogo pillar (IBC), the malleability of the IBC provided by the conditions on the hanging sideways in IBC triangular prisms alternate short-delay blasting to the goaf previous block hole fans with a decrease in each subsequent fan of its width, and the last hole in the corner thump of hands prisms come from the border IBC by connecting the camera to the distance of the radius of destruction of the explosion of the charge of this well. The mining pressure is close to the limit for ore array of cutting a slit in the adjacent block are from IBC at a distance equal to the thickness of the layer, the thump of hands in one massive explosion together with the breaking of a triangular prism in the IBC. 1 C.p. f-crystals, 5 Il.

The invention relates to the mining industry and can be used in the development of underground Rudnik t is Levi whole, where artificial pliability of the pillars give after extraction chamber stocks, contouring pillars, through education in the array pillar or in the zone of its contact with the host rocks systems parallel alternating charging holes and countervailing wells, loading and blasting holes with an interval of deceleration [1]

The disadvantages of this method include the high complexity and the complexity of performing the compensation of the wells and the charging holes of various drilling equipment, especially if the width of the pillars is more than 3 m, because it is difficult to sustain their direction and there is nothing to drill boreholes of depth, for example, up to 10 m in diameter compensation wells up to 150 mm, which provides existing drilling equipment, compliance will not exceed 10 to 20 mm, and requires 200 to 300 mm or more, the voltage is reduced by only 5 to 10% To drill special boreholes with a diameter of 500 60 mm is practically impossible due to their complexity, especially when unloading long tape pillars.

Closest to the proposed invention to the technical essence and the achieved result is a way to create a supporting pillar, where, after penetration of the cutting gap and the conditions on the sections hour is under entirely formed by drilling, the charging and blasting on compensatory production of a layer of rocks width equal to the width of the base of the pillar and a height equal to the height of compensatory production, and the blasting explosive charge in the specified layer and peripheral sections of the chamber reserves, subject to the pillar, are performed simultaneously [2]

The disadvantages of this method are: the necessity of penetration at the base of the pillar compensatory production, which increases the complexity of works to ensure compliance pillar; when using a combination of pliable patrocinia pillars, where compliance is carried out under the hanging sideways and pliable mezhdunarodnogo pillar (IBC), where the pliability of the base of the pillar exercise in the supine side, there is a need for artificial segment patrocinado pillar from IBC to facilitate their relative displacement, which will lead to the violation of openings passing through the plane sections of the IBC in the ceilings, and SnagIt mine safety; after repayment of the IBC repulsed ore will revert to the workings of issue together with the smitten rock from the area of compliance, i.e., they will be mixed, which will lead to increased contamination and ore losses from the redemption of pillars in relation to the traditional production under the arr is the cookie compliance IBC, reducing clogging and ore losses.

This objective is achieved in that during the development of the ore bodies of the chamber systems with pliable whole, including the division of the field into blocks, carrying out production and cutting slits, the extraction chambers, drilling and blasting hole fans, collapse after the release of ore from the camera and release repulsed stocks pillars under the collapsed rocks, yielding IBC carried out prior to the excavation chamber stocks, but after the sinking of the cutting slits on the border with IBC, by the conditions under hanging sideways in IBC triangular prisms alternate short-delay blasting to the goaf camera previous block hole fans with a decrease in each subsequent fan of its width and the last hole in the corner thump of hands prisms come from the border of the IBC on the distance of the radius of destruction of the explosion of the charge of this well, then start testing chamber stocks and obresult patrocinia pillar IBC previous block.

In Fig. 1, 2 shows a specific example of implementation of the proposed method on prior to the issuance of compliance IBC of Fig. 3 after making compliance IBC of Fig. 4, 5 the same, at the location of the cutting gap is not on the drilling Horta 1, pin 2 and generation 3, razvarivat fans wells 4 for blasting triangular prism beneath the hanging sideways in IBC X-Y, fans wells 5 for repayment squeezable PetroChina 6 in block Y, and fans of well 7 for blasting chamber X, which is followed by cutting the slit 8. After testing the camera Y produce short-delay blasting fans wells 4 and the last blow hole 9, an explosion which generates broken the top of the IBC X-Y, partly wytaliba array in the direction of the chambers X and Y. After registration of IBCS X-Y block Y extinguish the pillars and start breaking the ore in the chamber X.

At the time of registration of IBCS X-Y, he happens convergence (mixing) hanging and lying laterally, resulting in tear his broken top. This convergence and crushing the top of the pillar will continue while blasting chamber X. the result is that the expected high voltage IBC X-Y will decrease to a value corresponding bearing capacity of crushed material in the top. In General, the load on the pillar will be negligible, allowing 2-3 times to reduce its width. At the same time access the collapsed rocks from the block Y in the camera X with MCC X-Y will be closed. To apply such pillars can be combined with pliable patrocinada zadania, where Samoobrona hanging side is not expected, i.e., not have reached the limit of its area employment.

To apply the proposed IBC can be in combination with a pliable supporting pillars that maintain overlapping species.

The proposed method of development allows you to safely and effectively execute the malleability of the IBC under high rock pressure, performing work in two ways:

1) to form a cutting gap on the border with IBC, when her education does not lead to the destruction not yet unloaded IBC;

2) to form a cutting gap at the greatest possible distance from the border IBC, increasing the width of the ore mass between the waste chamber and the cutting slit.

This will reduce the amount of stress in it compared to the first option that gives you the ability to work under higher ground pressure than in the first embodiment. Practically, this method is applicable even when the stress values in the ore array adjacent to the formulation 4, which is close to the upper limit, because the formation of a narrow cutting gap does not increase the stress concentration on a specific section of the ore of masela capacity of 10 to 50 m from 1980 apply pliable patrocinia pillars in combination with a rigid IBCS. Currently, when developing a new horizon as a result of extremely high stresses in the rock mass have been in a situation where hard IBC width of 25 to 40 mm should be destroyed. This is confirmed by the fact that in the ultimate state is already adjacent to the ore camera array. Hanging side is in a stable state. Therefore, the proposed mine upon completion of the break-down of inventories in the first on the horizon generation 4 length of 120 m project pliable IBC width of 10 m ore body thickness of 15 m and the height of the floor 60 m Cutting the slit 8 of the next block must be referred from the border IBC 7.5 M. This layer of ore will be repulsed by cutting a slit through short-delay blasting three fans wells simultaneously with the breaking of three-cornered prism in IBC.

In the next block when the thickness of the ore body 40 50 m was left pliable IBC width 15 m Block had a length of 50 m and also succeeds.

Application of the proposed method of development allows 2 to 3 times to reduce the amount of ore in the IBC, while maintaining its stability and preventing it rock bursts. Repulsed from IBC ore is produced usually with losses and blockage up to 50% and Consequently, as a result of lower volume of ore in the AMI with pliant pillars, including the sinking of mines, drilling and blasting of the array of fans wells, formation of pliability mezhdunarodnogo pillar by blasting borehole charges, characterized in that the pass of the cutting slit for blasting connecting the camera to the formation of pliability mezhdunarodnogo pillar, yielding pillar formed by blasting it under the hanging sideways triangular prisms alternate short-delay blasting to the goaf previous block hole fans with a decrease in each subsequent fan of its width, and the last hole in the corner thump of hands prism Buryats from the border mezhdunarodnogo pillar to the side of the camera at a distance of radius fracture of the explosion of the charge of this well, then work out the chamber reserves and obresult patrocinia pillar previous block and mezhdublokovite pillar.

2. The method according to p. 1, characterized in that the cutting slot in the adjacent block are from mezhdunarodnogo pillar at a distance equal to the thickness of the layer, the thump of hands in one massive explosion together with the breaking of a triangular prism in the pillar.

 

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