Method for shooting of ores and rocks on underground mining works

FIELD: mining.

SUBSTANCE: method for shooting of ores and rocks on underground mining works includes drilling-off of a broken volume by opposite wells or blast holes, drilled from upper and lower drilling mines, their charging and exploding. An initiating charge in each well or blast hole is arranged at the distance La=2.25•dw, m from the bottom of the well or the blast hole, where: dw - diameter of a well or a blast hole, m, and distance between ends of opposite wells or blast holes determining thickness of a broken layer, is accepted as equal to L=2•Rr.e.+0.9•Do, m, where L - distance between ends of opposite wells or blast holes, drilled from upper and lower drilling mines, m; Rr.e. - radius of a damage zone from end action of a charge, m; Do - diameter of a bulk piece, accepted for the applied technology, m.

EFFECT: reduced specific and total flow rate of drilling, due to increased efficiency of using explosion energy.

3 dwg

 

The invention relates to mining, particularly underground mining of ore deposits.

Known used on underground work in explosive blasting fans ascending borehole charges in the variant system sublevel caving ore thump of hands on the ground sublevel delivery drifts (see Agoshkov M.I., S. Borisov, boyar, VA Development of ore and non-metallic deposits. M., Nedra, 1970, p.160-163). In this case, the drilling ascending fans of deep wells on the entire height of the substage with their subsequent blasting is carried out from a rifled poroporoaki drifts. The disadvantage of this method is the increased specific consumption of the development workings that take place to implement the method, and as a result, increase the cost of doing drilling and blasting.

The closest in technical essence and the end result is way blasting opposing fans wells of the upper and lower poroporoaki drifts with subsequent simultaneous blowing and the collapse of broken ore on the ground bottom bugreporting drift. In this scenario, you receive the opportunity to increase the height of the substage and thus reduce the amount of development workings (see Manitou V.R. Processes of underground mining operations in the development of ore deposits. M., Nedra, 1978, p.62, s).

The main disadvantage of this method is the overruns BB, energy and money in the ore mass destruction - pillar in the docking area of the bottom parts of the radial wells because of the inevitability of getting the extreme zones of the connecting pillar in the region is poorly controlled fragmentation, which increases the output of the coarse fractions from this zone and does not exclude cases of partial narraboth.

Task to be solved by the claimed invention is directed, is the creation of a method of blasting ores and rocks in underground mining operations, ensuring the reduction of specific and General flow of drilling, as well as increasing the energy efficiency of the explosion.

The problem is solved by creating a way of blasting ores and rocks in underground mining, including drilling thump of hands volume massif counter wells or boreholes drilled from the upper and lower drilling excavations, loading and blasting, a difference which, according to the invention is that the initiator charge in each well or borehole located at a distance La=2,25•dc, m, from the bottom of the well or borehole,

where dcthe diameter of the well or bore-hole, m,

and the distance between the opposite ends of the wells or bore-holes, which determines the thickness of the layer thump of hands is equal to L=2•RGT+0,9•Dn, m,

where L is the distance between the ends JAC is cnyh wells or bore-holes, drilled from the upper and lower drilling workings, m,

RGTis the radius of the zone of destruction from the face validity of the charge,

Dn- the diameter of the oversized piece accepted for applied technology, m

When carrying out the inventive method is achieved technical result consists in the fact that the bottom of the "active" mass charge end action detonates before the remainder of the charge and provides a more complete transfer of energy in an array adjacent to the bottom of the borehole or well, and the destruction of this array in the volume limited by the radius of the zone of destruction from the face validity of the charge.

Experimental studies (see Avidinii, Ebiko. The stemming of blast holes. Ed. TOGA, Khabarovsk, 2008, p.29) showed that the active mass of the charge, acting in the mechanical direction and influencing the deformation of the environment, increased only by increasing the length of the end part of the charge to the value ofwhere dcthe diameter of the hole charge. Thus, in the end the direction of the blast hole or borehole charge applies only to the active mass of the explosive charge of length La=2,25dc.

On the other hand in a number of scientific research (Env. Mathematical methods and models in the calculations on a computer. M., Ed. Bauman, 1996, pp.31-32) on the assessment of explosive destruction of rocks, consideration is given to the existing structure and fracture of rocks, detonation and power characteristics CENTURIES, it is established that there is no clear boundary between the zone of collapse and crushing (crushing with intensively developed system of cracks) and the subsequent area of the radial crack formation. The zone controlled destruction well, blast hole charge consists of a shear zone and crushing and directly adjacent zone of radial fracturing.

(Standard design of drilling and blasting operations area "bachat" LLC "KRU-varitron", 2005, p.24-25) radius zone of the regulated destruction is estimated by the relationship:

where Rpis the radius of the zone of destruction, m;

f is the coefficient of the fortress of rocks on Dan, units;

ρ is the density of EXPLOSIVES in a drill hole or borehole, kg/DM3.

The radius of the zone of destruction from the face of the actions of the blast hole or borehole charge equals 1/3 radius fracture in the plane perpendicular to the axis of the cylindrical charge, ie:

When the explosion initiating charges the front of the detonation wave moves through the charge in opposite directions from the point of initiation. In the bottom of the "active" mass charge end action detonates before the remainder of the charge and provides more complete eradico energy in the array, adjacent to the bottom of the borehole or well, and the destruction of this array in the volume limited by the radius of the zone of destruction from the face validity of the charge is determined by the dependence (2).

Given the symmetry of the process when using the counter wells or bore-holes, the distance between their ends, which will be provided with quality controlled crushing of the array, can be taken equal to:

where L is the distance between the opposite ends of the wells or boreholes drilled from the upper and lower drilling workings, m;

RGTis the radius of the zone of destruction from the face validity of the charge,

Dn- the diameter of the oversized piece accepted for applied technology, m

The invention is illustrated by drawings:

- figure 1 shows the General scheme of conducting blasting opposing wells or boreholes drilled from the upper and lower drilling excavation;

- figure 2 shows the location of the priming charge in the blast hole or borehole;

- figure 3 shows the scheme of interaction of counter-wells or bore-holes.

In the drawings shows the thump of hands the amount of mountain - 1, upper 2 and lower 3 production drilling, counter drilling wells or bore-holes - 4, the bottom of wells or bore-holes - 5, the bottom part 6 of the General charge (charge end), total charge - 7, for initiating the poison-action - 8, the zone of destruction - 9 from the mechanical action of the charge, typical gap - 10, the thump of hands layer 11.

The method is implemented as follows.

The thump of hands the amount of the massif 1 amerivault counter wells or bore-holes 4 of the upper 2 and lower 3 drilling workings using well-known methods for the determination of passports drilling (figure 1). In each well or bore-hole 4 have the explosive charge 7 of known construction, which is set in a known manner initiator charge 8 at a distance of La=2,25dcfrom the bottom of the well or borehole, where dcthe diameter of the well or bore-hole 4. Form, therefore, the bottom part 6 of the General charge 7.

After the explosion of the priming charge 8 the process of detonation develops in opposite directions, in the bottom part 6 charge 7 the process of detonation develops from the priming charge 8 toward the bottom of wells or bore-hole 4, so the energy of this part of the charge 7 intensively destroys the array 1 in areas adjacent to the bottom 5 of wells or bore-holes 4, forming a zone of destruction 9.

The amount of destructible array 1 that are within the zones of destruction 9, will be inevitably destroyed by the detonation of the bottom part 6 charge 7.

Given the existing technological requirements as a crushing array 1, which is expressed in minimizing output oversize fractions, the size dependence is from the applied technology, you can further increase the volume indices of blasting through inclusion in size thump of hands layer 11 rock gap 10 between the zones of destruction 9, the size of which is 0.9 of the value of the passed size oversized. Then the width of the thump of hands layer 11 between the ends 5 of counter wells or bore-holes 4 will be:

L=2•RGT+0,9•Dnm

where L is the thickness of the layer thump of hands, m;

RGTis the radius of the zone of destruction from the face validity of the charge determined by the known dependencies:

a is the coefficient of the fortress of rocks on Dan, units;

ρ is the density of the explosive, kg/DM3.

Dn- the diameter of the oversized piece accepted for applied technology, m

Thus, the claimed method in comparison with known methods blasting of rocks in underground mining reduces specific and General flow of drilling by increasing the efficiency of use of energy of the explosion.

The way blasting ores and rocks in underground mining, including drilling thump of hands volume massif counter wells or boreholes drilled from the upper and lower drilling excavations, loading and blasting, characterized in that the initiator charge in each well or borehole have to be the NII L a=2,25·dcm from the bottom of the well or borehole,
where dcthe diameter of the well or bore-hole, m,
and the distance between the opposite ends of the wells or bore-holes, which determines the thickness of the layer thump of hands is equal to L=2·RRT+0,9·Dn, m,
where L is the distance between the opposite ends of the wells or boreholes drilled from the upper and lower drilling workings, m,
RRTis the radius of the zone of destruction from the face validity of the charge, m,
Dn- the diameter of the oversized piece accepted for applied technology, m



 

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