SU1490283A1 - Method of breaking-off ore body - Google Patents

Abstract

The invention relates to the mining industry and m. B. used in the development of flat and sloping ore bodies without people entering the clearing space under conditions of elevated rock pressure. The goal is to improve the quality of blasting due to a change in the specific energy resistance of the destruction of the array, depending on the distribution of the explosion energy over the height of the recoiling layer. The ore massif is filled with fans of wells (BC) from a drill working. The plane of the sun is inclined to the boundary of the underlying rocks at an angle determined by a special mathematical relationship. In each aircraft, wells are drilled along a sparse grid. The ends of these wells of each successive BC are located in the plane passing through the mouth of the previous BC in the direction of the maximum stresses. After the layer is crushed, fracturing is induced in the cantilever part of the ore mass under the action of rock pressure. The charges in the next aircraft explode with a slowdown, not less than the time of cracking in the cantilever part of the ore massif. 3 il.

Description

(21) 4315430 / 23-03 (22) 12,10.87 (46) 06/30/89. Bup. No. 24 (75) Yu.D.Orlov, S.M.Bekbayev, M.Zh.Bitimbaev, G.V. Sauter, V.M. Kindirenko, T.Kabetenov, G.S.Tsoy and G.I.Bulychev

(53) 622.274 (088.8)

(56) Named by V.R. The processes of underground mining in the development of ore deposits. M .: Nedra, 1984,

with . 159.

USSR Author's Certificate No. 104699, cl. E 21 C 41/06, 1954.

(54) METHOD FOR DISPOSAL OF ORE MASSIF

(57) The invention relates to the mining industry and m. used in the development of flat and inclined ore bodies without a visit to the lake

into the treatment space under the conditions of increased rock pressure. The goal is to improve the quality of breaking due to

changes in the specific energy resistance of the destruction of the array depending on the distribution of the energy of the explosion along the height of the recoiling layer. The ore massif is filled with fans of wells (BC) from a drill working. The plane of the sun is inclined to the boundary of the underlying rocks at an angle determined by a special mathematical relationship. In each aircraft, wells are drilled along a sparse grid. The ends of these wells of each subsequent BC are located in the plane passing through the mouth of the pre-aircraft in the direction of the maximum stresses. After the layer is crushed, fracturing is induced in the cantilever part of the ore mass under the action of rock pressure. The charges in the next aircraft will vortex with a slowing down of not less than the time of crack formation in the cantilever part of the ore massif. 3 il.

i (L

The invention relates to the mining industry and can be used in the development of flat and inclined ore bodies without entering the treatment area under conditions of elevated rock pressure.

The purpose of the invention is to improve the quality of blasting due to a change in the specific energy consumption of the destruction of the array, depending on the distribution of the energy of the explosion on the height of the recovered layer.

Figure 1 shows the camera before the blasting of the next layer of ore; on

FIG. 2 is a view A in FIG. Fig. 3 is a diagram for determining the angle of inclination of the PLANE of fan wells.

The method is carried out as follows.

Transport 1, drilling 2 and ventilation 3 exercises are carried out. A cut-off slot 4 is formed in the lower part of the block. From the drilling output of the drill, fans of 5 blast holes in a plane inclined to the bottom of the bedrock at an angle determined from the ratio

d -arcsin -sin (/ i-) J - () + 180.

4ib

CO

ABOUT

to

oo

GO

where W is the line of least resistance between adjacent blast hole fans; m is the power of the ore body; / 1 is the angle between the direction of action of maximum stresses and the horizontal; J- - angle pades1 ore body. The arrangement of the fans in the specified plane allows to form a console in the downhole part of the ore mass.

The upper wells of each fan are drilled along a sparse grid. The ends of these wells 6 in each subsequent fan are positioned in a plane 7, passing through the mouth 8 of the previous fan in the direction of the maximum stresses.

After blasting explosives in the wells of the fan closest to the cutting slot, the cracking time in the cantilever part 9 of the ore body is determined by any known method, for example, an RTD device.

The breaking of the next array is carried out by blasting explosive charges in the next fan with a slowdown, not less than the time of cracks, due to a change in the specific

Vani in the console part of the ore massif.

After the next layer has been crushed, a fracture is induced in the cantilever part 9 by the action of rock pressure. At the same time, the intensity of the cracks is unevenly distributed along the height of the layer from the lying to the hanging side, the intensity of the cracks increases, and consequently, the specific energy intensity of the fracture decreases. This leads to the fact that during the blasting of the next layer, the explosion energy is distributed in accordance with the physicomechanical state of the layer being repulsed,. those. The least explosive energy is distributed to the upper most weakened areas of the bed due to the location of the wells in these areas along the sparse grid, and the most explosive energy is distributed to the lower, most durable areas of the bed due to the thickening of the network of wells. This reduces the yield of oversize, eliminates overgrinding of the ore, reduces the seismic effect of banging on the roof of the chambers while reducing the volume of drilling and blasting operations.

When exploding charges of amorphous explosives and an alternate fan of wells in the upholstery (; the first layer, zones 1.11, 11 s are formed; various specific energy intensity of destruction, decreasing from lying to the hanging side, due to induced failure.

0The location of the ends of the upper wells of each subsequent fan in the plane passing through the wellhead of the previous fan is parallel to the direction of the maximum

5 voltages allows maximum

reduce the specific energy intensity of the destruction of the array in the upper part of the layer being beaten off.

0 Formula of invention

The method of blasting the ore mass, including the driving of transport, ventilation and drilling workings, 5 forming a cut-off slot in the lower part of the block, drilling explosive well fans and detonating explosive charges in the wells, which, in order to improve the quality of

energy intensity of the destruction of the array, depending on the distribution of the explosion energy over the height of the recoiling layer, the fan of the explosive wells is drilled in a plane inclined to the boundary of the underlying rocks under the angle -: determined from the ratio

0

0 5

where w

(() + 180,

five

m P

IS

the line of least resistance between adjacent fans of blastholes; ore body power; the angle between the direction of the maximum stress and the horizontal; the angle of the ore body, the upper wells of each fan are drilled along a sparse grid with the ends of these wells in each successive fan in a plane passing through the wellhead of the previous fan in the direction of the maximum stresses, and the explosive charges in each successive fan deceleration, not less time) and the formation of tracks in the console part of the ore massif.

1

V.e l

Zone

ZonAZh

she

Fi.g

Sh

Claims (1)

Claim A method of breaking the ore mass, including driving transport, ventilation and drilling workings, forming a detachable gap in the lower part of the block, drilling fans of blast holes and blasting explosives in the boreholes, which differs in order to improve the quality of the hammer due to changes in the specific energy consumption of mass destruction depending on the distribution of the explosion along the height of the beat off fan of the blast holes, bones are bent, inclined to the boundary of the barking rocks at an angle determined from the ratio of the charge, from the 35 layer energy, at a thickness of 40 d = - arcsin ^ sin (/ J-y) j - (^ - ^) + 180, line of least resistance between adjacent fans of blast holes; ore body power; the angle between the direction of maximum stress and the horizontal; angle of incidence of the ore body, wells of each fan are drilled where W 45 Ние the top along the rarefied grid with the location of the ends of these wells in each subsequent fan in the plane passing through the mouth of the wells of the previous fan in the direction of maximum stresses, and the explosive charges in each subsequent fan explode with a slowdown not less than the cracking time in the cantilever part of the ore mass.