SU1518651A1 - Method of mining benches in quarry - Google Patents

Abstract

This invention relates to the open development and operation of coal, ore and non-metallic steeply dipping deposits. The purpose of the invention is to increase the stability of the escarpment slopes by reducing the effect of blast hole charges on them. In the plane of the slope of the newly formed ledge, a drill of a number of inclined contour wells and fill the ledge with rows of firing wells. At the same time, the last and the last but one from the slope of the working ledge of a row of firing wells is drilled with an inclination at an angle of 60-75 ° to the horizon in the direction of a row of contour wells and with a gap to this row equal to 4-8 diameters of the firing charges. The mouth of the boreholes of the last but one row is located at a distance of 30-45 diameters of the firing charges, and the last row is located in the middle of this distance. Then the wells of the contour row charge explosives and explode. In this case, a slit is formed. Then blast holes are blown up. The breaking of the array is directed in two directions: from the first and second row of wells towards the developed space and from the bottom of the last and penultimate rows of wells towards the exposed horizontal surface of the ledge along the previously created slit. Due to the rational location of the last and next-to-last row of wells on the ledge, the funnels forming the well charges of these rows are combined with the plane formed by the cutting gap. In this case, the step plane is prevented from being destroyed by the explosion of the bottom part of the charge of these wells.

Description

(21) 4382539 / 23-03

(22) 11/24/87

(46) 10.30.89, Ex. No. 40

(71) Kazakh Polytechnic Institute. IN AND. Lenin

(72) B.P. Rakipshv, F.B. Mukhamedzhanov, D.G. Bukeikhanov, MB Sadykov

and I.V. Lunkin J53), 622.235 (088.8)

(56) USSR Author's Certificate No. 795077, cl. F 21 C 37/00, 1978.

Brotanek I. and others. Contour blasting in mining and construction, M .: Nauka, 1983,

4) METHOD FOR DEVELOPING SET / POV ON CAREER

(57) The invention relates to the open development and operation of coal, ore and non-metallic steeply dipping deposits. The purpose of the invention is to increase the stability of the slopes of the ledges by reducing the effect

borehole charge explosions on them. In the plane of the slope of the newly formed ledge, a drill of a number of inclined contour wells and fill the ledge with rows of firing wells. In this case, the last and the penultimate of the slope

the working ledge of the row of boreholes is drilled with a slope at an angle of 60-75 ° to the horizon in the direction of the row of contour wells and with a shortage of up to this row equal to 4-8 diameters of the baffle charges. The mouth of the boreholes of the last but one row is located at a distance of 30-45 diameters of the firing charges, and the last row is located in the middle of this distance. Then the wells of the contour row charge explosives and explode. This forms a slit. Then blast holes are blown up. The breaking of the array is directed in two directions: from the first and second row of wells towards the developed space and from the bottom of the last and penultimate rows of wells towards the exposed horizontal surface of the step along the previously created slot. Due to the rational location of the last and next-to-last row of wells on the ledge, the funnels forming the well charges of these rows are combined with the plane formed by the cutting gap. In this case, the step plane is prevented from being destroyed by the explosion of the bottom part of the charge of these wells,

cl

ate

thirty

 : l

The invention relates to the open development and operation of coal, ore and nonmetallic steep deposits, composed of hard rocks hanging more closely than the side, prone to destruction from seismic and explosive waves in the environment with explosion.

zone, and can also be used in energy construction.

The purpose of the invention is to increase the stability of the ledges of the benches by reducing the effect of blast hole charges on them.

The method is carried out as follows.

As an example, take a steeply falling deposit with a yi-lump of rock strata of 50-60 °, the field is mined by ten-meter ledges and, at the point ofGP shanii B, the marginal position of the ledges are doubled. It is necessary to arrange a decimeter ledge on the side than in a limiting position. The tussock is represented by rocky rocks of the type of dolomites, limestones prone to destruction from an explosion in the zone adjacent to the explosion. In connection with this, a safety barrier is created in advance along the contour line,

Drilling of wells at a quarry is carried out by 2G.BSH-200N machines equipped with roller bits of 215 mm in diameter. The width of the marginal strip is determined taking into account the distribution of disturbance from the adjacent ledge array, considering the last row of wells of the previous mass explosion, which equal to 120 + 150 diameters of the explosion.

The diameter is equal to the diameter of the blast holes, and the diameter of the wells when drilling with 2SBSh-200N machines using 215 mm drill bits is 220 mm, with 3TkiM ip1rin. marginal strip should be in the range of 26.4-33 m.

To create a preliminary cut-out slit, inclined contour wells with a length of 24 m to a height of two meter-long ledges in the plane of the newly formed ledge at a distance of 2.0 m in a row at an angle of 75 ° in the developed space were drilled.

The distance from the edge of the upper scarp to the wellhead of a slotted row on the surface of the ledge is 27.5 m. Then the wells of the slotted row charge explosives using special structures, and charge them. Thereby, a preliminary cutting gap is applied,

In the case of the compressed valve1: n of the i: a drilling, the OTpa6aTbiBaef- .oro of the marginal strip block is drilled from the plane of the preliminary cut-off slot towards the open space

With the help of the equipment OSU-2 or SCU-2, the airway capacity is determined at

0

contour array of ledge in accordance; - due to the provisions of the standard methods of drilling and blasting parameters in quarries according to the preliminary assessment of the massif by the instrumental method,

For example, for a given array, the value of the reduced effective velocity is 53 m / s, which corresponds to the specific consumption of explosives and about 0.77 kg / m. The known formula determines the line of resistance along the sole, which is overcome by the energy contained in a charge with a diameter of 220 m and a vertical location of the wells 1.23 with a specific consumption of explosive qp 0.77. kg / m3

R - 0.77

W,

 0.9 I- 0.9

 1 hr

five

0

five

0

five

0

 6.0 m

where W. is the line of resistance along the sole at the vertical location of the wells, M} P is the capacity of the explosive well at a density of 0.9 kg / dm, kg.

Now the task is to design the i-plane of the shoulder slope to the limiting position, without disturbing the natural continuity of the edge array and the plane (wall) formed by the preliminary cut-off song. For this, the last and the last but one row of boreholes is drilled with an inclination of 60–75 ° to the horizon in the direction of the existing slot by 2CB1CH-200N machines. The bottom of the explosive wells of the last and penultimate rows are not reached to the plane formed by the safety slot for a distance of 4 -8 charge diameter, which is 0.88 + 1.76 m.

When drilling the last and next-to-last row of wells at an angle of 60-75 ° relative to the horizontal plane of the ledge, the energy enclosed in the borehole diameter is 220 mm and is able to overcome the resistance line pn of the array bottom equal to

W,.

 sino (cK

R

5p sin

7.2 m

where W is the line of resistance along the sole with an inclined arrangement of wells, m.

515/865)

 the slope angle of the after-hole wells at the base of the ledge of the first and penultimate series is more than 6.0 m, relative to the horizontal. Therefore, in order not to leave the plane of the ledge, hail. Thresholds on the horizontal surface. On the horizontal surface of the lower ledge, the recess of wells 1 of the ledge of the wellhead is increased by 0.5 m. In this connection, the last row is drilled to the first row of wells is drilled to a depth of 9 m from the plane, which is 12.5 m, the distance between the wells of the pre-cutting bath Q in this row is 6.0 m,

a slit, and the last row of wells — next determine the necessary 4,5-meter distance between the penultimate number of explosives for crushing, rocks and the plane formed by the pre-border contour of the design. cut off slots, the benches in the perfect position, the FIRS of the corresponding distances x t5 and the fifth row of the explosion from the plane formed by the preliminary deceleration, then the second cut and the tearing slit, set the fourth row after 25 ms and the last drilling rig 2S1CHB-200N and under it blown up after 50 ms the third row at an angle of 60-75 begins the drilling of the last wells.

a row of wells at a depth of 6.0 m. 20 Breaking up a rock massif — the distance between the bottom is bored in two directions: from the core and the plane of the slit remains more than that and the second row of skies - 1 m. The distance between the wells in the well-developed space, the last row leaves 3.0 m, the Last direction - from the bottom of the last turn of the last row of wells - 25 and the penultimate row of wells - the drilling machine is distilled at the spacing of the bare horizontal position 4.5 m in the direction of the developed Nost ledge along the preliminary second space where drilled parallel to the gap created.

However, the last row of wells in the process of detonation of the last well was 13 meters, leaving the distance between the DA and the penultimate row of wells behind the bottom of the penultimate row of wells and the expense of their rational location not by the plane formed by the indentation of the ledge cut-off slit, more than 1 m. Developing hole funnels. These charges are located between the wells in the last and the last but one rows of an ice row of 6.0 m, with the plane formed by the preliminary drilling rig with the refining cutting chamber, and the depth gauge. 3.5 m from the penultimate row in menns, the created plane of the ledge to the side of the developed space is prevented from collapsing at Bzrs as the resistance line is at the height of this part of the charge of these wells at the bottom of the vertical row of wells and dd due to the lack of the last and the inclined penultimate row of the next-to-last row of wells up to 6.0 m. The vertical row of wellbore formed by the pre-drill is drilled to a depth of 12.0 m, as the cutting gap, the height of the ledge is 10.0 m and 2.0 m perebor, and the distance between the wells The Formula of the image; a row of 6.0 m. The method of working out;.; 1 u.tupopa kpr'yiAfter the construction of a row of verticals, including in the well wells, the drilling machine of the distillation slope again forms my step at a distance of 6.0 m from the row to the cistern of inclined contour wells, to the side of the developed space. 50 pazat-ni ledge of the well wells is drilled at a depth of 12.0 m, the charging of squalls is anticipated to 6.0 m the distance between the bloody formation of the cutting gap with the ends in the row, the explosion of downhole wells

Lastly, the first and the breaking of the ledge with an explosion of charges of a number of firing wells is boiled. The mouth of the first drilling wells, distinguishes wells by a distance of 6 ohms from the fact that, with the aim of raising the second row towards the developed piece of stability of the slopes of the slopes beyond the space bar and 3.0 m from action on .did in accordance with Frfli. Then, the line of charge breaks wells, pos715185618

the last and the last but one from the off-site discharge of the drv, while the mouth of the working step of the row of fender-chink wells of the last-last row of wells with a slope at an angle is located at a distance of 30-45 di- 60-75 to the horizon in the direction of ram diameters of chisel charges, and the last contour wells and with a shortage of bottom row - in the middle of this distance, equal to 4-8 diameters or none.

Claims (1)

Claim A method for working out benches on a quarry, including drilling a recession of a newly formed ledge of a series of deviated contour wells, drilling a ledge with rows of boreholes, loading wells, preliminary formation of a cutting gap by blasting the charges of contour wells, and breaking the ledge by an explosion of charges of borehole boreholes, characterized the fact that, in order to increase the stability of the slopes of the ledges by reducing the effect on them. 1518561 the ice and penultimate from the slope of the worked-out ledge rows of jack wells with an inclination at an angle of 60-75 ° to the horizon towards a number of contour wells and with a gap to this row equal to 4-8 diameters of jack wells, with the mouths of jack wells of the penultimate row located on a distance of 30-45 diameters of the jack charges, and the last row - in the middle of this distance.