RU2444625C1 - Development method of tube-like and thick ore bodies - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: development method of tube-like thick steep and flat dipping ore bodies involves preparatory and first works, second mining with vertical cuttings along the spread or across the spread by means of drilling method for resources with large-diameter wells, ore output and goaf stowing. At that, width of cuttings is accepted equal to diameter of production well and second working is performed in cuttings in three stages. At the first stage the removed cutting is drilled along its length with transverse rows of vertical blasting wells throughout the height of the mining level. In the middle between the drilled transverse rows of blasting wells there drilled by means of known methods are scavenger wells and ore mass broken during drilling is shrunken owing to its partial drawing. At the second stage of the second mining of the cutting there drawn is ore mass shrunken in scavenger wells with further blasting of transverse rows of vertical wells throughout the height of the mining level and output of ore mass broken by blasting operations. At the third stage there filled is the worked-out area of the cutting with hardening stowing mixture.

EFFECT: higher efficiency of the development, crushing quality of the produced ore and creation of safe conditions for mining activities at high level of their mechanisation.

5 dwg

Description

The invention relates to the field of mining and, in particular, to the underground mining of tube-shaped and powerful ore bodies.

There is a method of underground mining of powerful ore bodies with ore extraction by chambers using borehole breaking [1]. The disadvantage of this method should be considered a sufficiently high yield of oversize and high labor treatment.

The closest in technical essence and the achieved result is a method of underground mining with drilling of ore bodies ^; [2]. The disadvantage of this method is the limited scope and high losses of ore in the bridges between production wells.

The aim of the invention is to increase the efficiency of development, the quality of crushing of mined ore and the creation of safe conditions for mining operations with a high level of mechanization.

This goal is achieved by the fact that the width of the sections is taken to be equal to the diameter of the production well and cleaning is carried out in sections in three stages: at the first stage, the removed section is drilled along its length with transverse rows of explosive vertical wells over the entire height of the floor, the distance between these rows is taken to be:

L _in = D + 2W,

where L _in - the distance between the rows of blastholes, m; D is the diameter of the well, m; W is the value of the LNS (line of least resistance), determined by a known method, m

Exactly in the middle between the drilled transverse rows of blast holes, one of the known methods is used to drill treatment wells with each of them storing the ore mass beaten out while drilling due to its partial release in the volume determined by the formula:

where V _in - the volume produced at the stage of drilling beaten ore mass, m ³ ; H - floor height, m; k _p - coefficient of loosening of the ore mass during mechanical destruction of the array; ΔL - well length required for placement and operation of the expander, m

At the second stage of the clean-out excavation, the ore is massed out of the ore mass, which has been stained in the treatment wells, followed by the blasting of the transverse rows of vertical wells to the entire floor height and the delivery of the ore mass repelled by explosion. At the third stage, they make the laying of the worked-out space of cutting with a hardening filling mixture.

The invention is illustrated by drawings, where figure 1 shows the General scheme of mining treatment unit. Figure 2 shows the sequence of work in the first stage of the treatment of the excavation. Figure 3 shows a horizontal section of the cut at the end of the first stage of the treatment of the excavation. Figure 4 shows the implementation of the second stage of the treatment of the recess. Figure 5 shows the implementation of the third stage of the cleaning recess in the section.

The method of developing tube-shaped and powerful ore bodies comprises a working block 1, inter-block pillars 2, worked-out sections 3, upper 4 and lower 5 threaded workings, a machine for drilling blasting holes 6, blasting holes 7, a complex 8 for drilling pilot 9 and treatment wells 10, expander 11, beaten ore mass 12, hatch device 13, loading and delivery machine 14, ore bridge 15, hardening tab 16, mined-out space 17.

The method is implemented as follows. Mining operations in the mining block 1, contoured between the block pillars 2, are carried out by sequential excavation along the strike or across the strike of the vertical mining sections 3. In each section 3 in a known manner, for example, using blasting operations, the upper 4 and lower 5 threaded workings .one). From the upper threaded workings 4 in the worked-out section 3, vertical transverse rows of blasting holes 7 are drilled to the entire height of section 3 at a distance from each other, determined by the formula:

L _in = D + 2W,

where L _in - the distance between the transverse rows of blast holes in the section, m; D is the diameter of the treatment well (cutting width), m; W is the value of the line of least resistance for real development conditions, m

Exactly in the middle between the rows of blasting holes 7 using known means, for example, drilling complex 8, a pilot well 9 is drilled, which is expanded to the diameter of the treatment well 10 with the help of the expander 11. The ore mass 12 that was broken during operation of the expander 11 is stored in the treatment well 10 to the entire height mined cut 3. For this, when the expander 11 from the formed treatment well 10 is a partial release of the beaten ore mass 12 in an amount determined by the formula:

where V _in - the volume of beaten ore mass discharged from the treatment well of large diameter during its drilling, m ³ ; H - active floor height, m; k _p - coefficient of loosening of the ore mass during mechanical destruction of the array; ΔL is the length of the well to the surface of the store, necessary for the placement and operation of the expander, m; through the hatch device 13 on the lower threaded excavation 5 with the removal of the broken ore mass 12 using known loading and transport vehicles, for example, using a loading and delivery machine 14 (Fig. 2). At the end of the drilling of all treatment wells 10 in the worked-out section 3, the ore bridges 15 between the treatment wells 10 (FIG. 3) are retreated in a descending order with the removal of the broken ore mass 12 by loading and loading machines 14 (FIG. 4). After the extraction of reserves of the worked-out spigot 3, it is completely, together with the top 4 and bottom 5 threaded workings, filled with a hardening tab 16 (Fig. 5).

Information sources

1. Imenitov V.R. Underground mining processes in the development of ore deposits. - M .: Nedra, 1978.- 527 p. (Fig. IV.11, p. 66-67).

2. RF patent No. 2059815 "Method for the development of steeply dipping underground formations." Application: 94026582/03, 08/01/1994. Published: May 10, 1996 (prototype).

Claims (1)

A method for the development of tube-shaped, powerful steeply dipping and dipping ore bodies, including preparatory and rifling operations, cleaning excavation by vertical sections along strike or across strike by method of drilling reserves by large diameter wells, ore output and laying of worked out space, characterized in that, in order to increase the efficiency and safety of mining operations, the width of the sections is taken equal to the diameter of the treatment well and these works are carried out in three stages: at the first stage, the extracted safety relay drilled out along the length of the transverse rows of vertical blasting holes to the full depth of floor, the distance between the rows is determined by the formula:
L _in = D + 2W,
where L _in - the distance between the transverse rows of blast holes in the section, m;
D is the diameter of the treatment well (cutting width), m;
W is the value of the line of least resistance for real development conditions, m;
in the middle between the drilled transverse rows of blast holes, one of the known methods is used to expand the pilot wells, with treatment wells storing each of them beaten off while drilling the ore mass due to its partial release in the volume determined by the formula:

,
where V _in - the volume of beaten ore mass discharged from the treatment well of large diameter during its drilling, m ³ ;
H - active floor height, m;
k _p is the coefficient of loosening of the ore mass during mechanical destruction of the massif;
ΔL is the length of the well to the surface of the store, necessary for the placement and operation of the expander, m;
at the second stage of the treatment excavation, mass production of ore mass discharged in the treatment wells is carried out, followed by blasting of the transverse rows of blast holes and the delivery of broken ore mass; at the third stage, they make the laying of the worked-out space of the cut with a hardening filling mixture.

Images