CN112097577A - Slope control blasting method near end - Google Patents
Slope control blasting method near end Download PDFInfo
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- CN112097577A CN112097577A CN202010787231.7A CN202010787231A CN112097577A CN 112097577 A CN112097577 A CN 112097577A CN 202010787231 A CN202010787231 A CN 202010787231A CN 112097577 A CN112097577 A CN 112097577A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
Abstract
The invention relates to a slope control blasting method near the end, which is characterized in that pre-cracked holes, buffer holes and main blast holes are sequentially arranged along the contour line of a slope towards the direction of the slope, explosives in all the pre-cracked holes are detonated at one time, then the main blast holes with the number of N equal to 1 are detonated, the other main blast holes are detonated sequentially at the same time delay interval according to the sequence of the number of the main blast holes from small to large, the buffer holes are detonated sequentially at the same time delay interval according to the sequence of the number of the buffer holes from small to large, and the buffer holes with the number of M are detonated, so that after the main blast holes with the number of N equal to M +2 are detonated, and before the main blast holes with the number of N equal to M +3, the method can effectively control blasting vibration, ensure the blasting effect and improve the stability of the end slope.
Description
Technical Field
The invention relates to the field of surface mine blasting, in particular to a slope control blasting method close to the end.
Background
The strip mine side slope is an important component of strip mining, the side slope is gradually formed from top to bottom, and the stability of the side slope directly influences the aspects of mine safety, economic benefit, service life, mining production and the like. With the development of mine construction in China, the height and angle of a side slope are gradually increased, and how to ensure safe and efficient mining is a major problem that a surface mine must be straight. Therefore, the slope damping is needed to be realized in the aspects of blasting technology, blasting design and the like, so that an efficient, simple and practical slope damping control blasting technology close to the slope is formed, the damage to the slope rock mass is reduced, and the slope stability is realized.
Disclosure of Invention
The invention aims to solve the problems in the prior art, namely, the invention aims to provide a slope blasting control method near the end, which can control blasting vibration and ensure slope stability.
In order to solve the technical problem, the technical scheme of the invention is as follows: a method of controlled blasting towards end of a slope, the method comprising,
step S1: arranging a row of pre-split holes along the edge slope contour line;
step S2: a row of buffer holes are arranged on the outer side of the pre-splitting hole in a direction parallel to the side slope contour line and towards the side slope, the buffer holes are numbered in sequence from the detonation initiating end, and the number of the buffer holes is marked as M;
step S3: a row of main gun holes are arranged on the outer side of the buffer hole in parallel to the side slope contour line and in the side slope direction, the main gun holes are numbered in sequence from the detonation initiating end, and the number of the main gun holes is marked as N;
step S4: sequentially loading water ball bags, explosives and blocking sand into the pre-splitting holes;
step S5: sequentially filling a first water ball bag, a first explosive, a second water ball bag, sand, a second explosive, a third explosive and blocking sand into the buffer hole;
step S6: sequentially filling emulsion explosive and blocking sand into the main blast hole;
step S7: detonating explosives in all the pre-cracked holes at one time;
step S8: detonating the main blast holes with N being 1, and sequentially detonating the other main blast holes at the same time delay interval according to the sequence of the main blast hole serial number N from small to large;
step S9: the buffer holes are sequentially detonated at the same delay intervals according to the sequence of the buffer hole numbers M from small to large, and the detonation of the buffer hole with the buffer hole number M needs to be performed after the detonation of the main gun hole with the N-M +2 and before the detonation of the main gun hole with the N-M + 3.
Further preferably, the method further comprises the steps of arranging a row of pre-split holes along the edge slope contour line,
the pre-splitting holes are arranged in a row, the curves formed by connecting the adjacent pre-splitting holes are parallel to the contour line of the side slope,
the distance between adjacent pre-split holes is 1.5-2 m, the aperture is 130-150 mm, and the ultra-depth is 1.0-1.2 m.
Further preferably, the method is characterized in that a row of buffer holes are arranged on the outer side of the pre-splitting hole in a direction parallel to the side slope contour line and towards the side slope, the buffer holes are numbered in sequence from the detonation initiating end, the number of the buffer holes is marked as M, and the method also comprises the following steps,
the row spacing between the buffer holes and the pre-splitting holes is 2.5-3 m, the spacing between adjacent buffer holes is 2.5-3 m, the aperture is 150mm, and the ultra-depth is 1.6-2.0 m.
Further preferably, the method is characterized in that a row of main gun holes are arranged on the outer side of the buffer hole in parallel with the contour line of the side slope and towards the direction of the side slope, the main gun holes are numbered from the detonation initiating end in sequence, the number of the main gun holes is marked as N, and the method further comprises the following steps of,
the row spacing between the main blast holes and the buffer holes is 3-3.5 m, the spacing between the adjacent main blast holes is 5.5-6.0 m, the aperture is 150mm, and the ultra depth is 2.0-2.5 m.
Further preferably, the pre-splitting hole is sequentially filled with a water ball bag, explosive and blocking sand, and the method also comprises the following steps,
placing a water ball bag filled with water at the bottom of the pre-splitting hole, wherein the height of the water ball bag is 0.5-0.6 m; then carrying out pre-cracking hole explosive loading, wherein the linear density of the explosive loaded in the hole gradually decreases from bottom to top, the explosive loading linear density gradually transits from the bottom of 3kg/m to the top of 1kg/m,
the explosive is filled in the hole by adopting a full detonating cord structure, and after the explosive is filled, the blocking sand is filled in the hole opening by 1.2 m.
Preferably, the buffer hole is filled with a first water ball bag, a first explosive, a second water ball bag, sand and soil filled at intervals, a second explosive, a third explosive and blocking sand and soil in sequence, and the device also comprises,
the buffer hole is charged in two sections, two sections of explosive columns are respectively provided with a same-section time-delay high-precision detonator,
the bottom of the lower part of the medicine-containing bag is firstly provided with a first water ball bag filled with water, the height of the first water ball bag is 0.6-0.8 m,
45-55 kg of first explosive is filled on the first water ball bag in a coupling manner,
then a second water ball bag with the height of 0.5m is pressed and covered,
then filling the mixture into sand soil 2-3 m at intervals,
then the upper part is loaded with powder, two kinds of cartridges with different diameters are loaded on the upper part, the lower part is provided with a second explosive, the second explosive is 20kg of cartridges with the diameter of 100mm, the upper part is provided with a third explosive, the third explosive is 15kg of cartridges with the diameter of 80mm,
finally, filling the blocking sand to the hole.
Further preferably, the step of sequentially filling the emulsion explosive and the blocking sand into the main blast hole further comprises,
the main gun holes are filled with continuous powder, 150-165 kg of powder is filled in each main gun hole,
after the emulsion explosive is charged, filling the blocking sand to the hole.
Further preferably, the main holes with N ═ 1 are detonated, and the rest main holes are detonated in sequence at the same delay interval according to the sequence of the main hole number N from small to large, and the method further comprises,
detonating the pre-cracked hole for 90ms, then detonating the main blast hole with N being 1,
and the other main gun holes are detonated in sequence at the same delay interval of 17ms according to the sequence of the main gun hole number N from small to large.
Further preferably, the buffer holes are sequentially detonated at the same delay time interval in the sequence of the buffer hole numbers M from small to large, and the detonation of the buffer hole with the buffer hole number M is required to be performed after the detonation of the main bore with the N-M +2 and before the detonation of the main bore with the N-M +3,
after 42ms of main hole detonation with N-1, the buffer hole with M-1 is detonated,
and the buffer holes are detonated in sequence at the same delay interval of 17ms according to the sequence of the buffer hole numbers M from small to large.
Further preferably, the method also comprises the steps of setting a row of second main blast holes on the outer sides of the main blast holes in a direction parallel to the contour line of the side slope and towards the side slope, numbering the second main blast holes in sequence from the initiation end of detonation, recording the number of the second main blast holes as K,
the row spacing between the second main blast holes and the main blast holes is 4.8-5.2 m,
after the pre-cracked holes are detonated for 120ms, the second main blast holes with K equal to 1 are detonated, the other second main blast holes are detonated in sequence at the same delay interval of 17ms according to the sequence of the serial number K of the second main blast holes from small to large,
after the second main gun hole with K equal to 1 is detonated for 65ms, the main gun holes with N equal to 1 are detonated, the rest main gun holes are detonated in sequence according to the sequence of the main gun hole number N from small to large at the same delay interval of 17ms, the detonation of the main gun hole with the buffer hole number N needs to be detonated after the main gun hole with K equal to N +2 is detonated and before the main gun hole with K equal to N +3 is detonated,
and after the main gun hole with the number of N being 1 is detonated for 42ms, the buffer holes with the number of M being 1 are detonated, the buffer holes are sequentially detonated at the same delay interval of 17ms according to the sequence of the buffer hole numbers M from small to large, and the detonation of the buffer hole with the number of M is required to be after the main gun hole with the number of N being M +1 is detonated and before the main gun hole with the number of N being M +2 is detonated.
Compared with the traditional blasting technology, the invention has the following beneficial effects: the method effectively controls blasting vibration and ensures the stability of the slope by arranging the blast holes of the pre-splitting holes, the buffer holes and the main blast holes and adopting a blasting method of orderly delaying and propelling in sequence.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
FIG. 2 is a schematic diagram of a pre-charge configuration according to an embodiment of the present invention.
Fig. 3 is a schematic view of a configuration of a buffer hole charge in accordance with an embodiment of the present invention.
FIG. 4 is a schematic diagram of a main hole charge configuration in accordance with an embodiment of the present invention.
Detailed Description
Example one
As shown in fig. 1 to 4, a method of controlled blasting a slope 1 near the end of the slope, the method comprising,
step S1: a row of pre-crack holes 1 are arranged along the contour line of the side slope 1;
step S2: parallel to the contour line of the side slope 1, towards the direction of the side slope 1, arranging a row of buffer holes 3 outside the pre-splitting holes 1, numbering the buffer holes 3 in sequence from the initiation end of detonation, and numbering the buffer holes 3 as M;
step S3: a row of main shot holes 4 are arranged on the outer side of the buffer hole 3 in the direction of the side slope 1 in parallel with the contour line of the side slope 1, the main shot holes 4 are numbered in sequence from the detonation initiating end, and the number of the main shot holes 4 is marked as N;
step S4: sequentially loading a water ball bag 5, explosive and blocking sand into the pre-splitting hole 1;
step S5: sequentially arranging a first water ball bag 52, a first explosive and a second water ball bag 51 into the buffer hole 3, filling sand, a second explosive and a third explosive at intervals, and blocking the sand;
step S6: sequentially filling emulsion explosive and blocking sand 6 into the main blast hole 4;
step S7: detonating the explosives in all the pre-cracking holes 1 at one time;
step S8: detonating the main blast holes 4 with N being 1, and sequentially detonating the other main blast holes 4 at the same time delay interval according to the sequence from small to large of the serial number N of the main blast holes 4;
step S9: the buffer holes 3 are sequentially detonated at the same delay intervals in the order of the numbers M of the buffer holes 3 from small to large, and the detonation of the buffer hole 3 with the number M of the buffer hole 3 needs to be performed after the detonation of the main bore 4 with the number N being M +2 and before the detonation of the main bore 4 with the number N being M + 3.
The side slope pre-cracking device is characterized in that a row of pre-cracking holes 1 are arranged along the contour line of the side slope 1,
the pre-splitting holes 1 are arranged in a row, the curve formed by connecting the adjacent pre-splitting holes 1 is parallel to the contour line of the side slope 1,
the distance between the adjacent pre-split holes 1 is 1.5-2 m, the aperture is 130-150 mm, and the ultra-depth is 1.0-1.2 m.
A row of buffer holes 3 are arranged on the outer side of the pre-splitting hole 1 in the direction of the side slope 1 and parallel to the contour line of the side slope 1, the buffer holes 3 are numbered from the detonation initiating end in sequence, the number of the buffer holes 3 is marked as M, and the device also comprises,
the row spacing between the buffer holes 3 and the pre-splitting holes 1 is 2.5-3 m, the spacing between the adjacent buffer holes 3 is 2.5-3 m, the aperture is 150mm, and the ultra depth is 1.6-2.0 m.
A row of main blast holes 4 are arranged on the outer side of the buffer hole 3 in the direction of the slope 1 and parallel to the contour line of the slope 1, the main blast holes 4 are numbered from the initiation end of detonation in sequence, the number of the main blast holes 4 is marked as N, and the device also comprises,
the row spacing between the main blast holes 4 and the buffer holes 3 is 3-3.5 m, the spacing between the adjacent main blast holes 4 is 5.5-6.0 m, the aperture is 150mm, and the ultra-depth is 2.0-2.5 m.
The pre-splitting hole 1 is sequentially filled with water ball bags, explosives and blocking sand and soil, and the device also comprises,
a water ball bag filled with water is placed at the bottom of the pre-splitting hole 1, and the height of the water ball bag is 0.5-0.6 m; then carrying out pre-cracking on the hole 1 to charge explosives, wherein the linear density of the explosives in the hole from bottom to top is gradually reduced, the charging linear density is gradually transited from the bottom 3kg/m to the top 1kg/m,
a structure that explosive is filled in a hole through a full detonating cord 21 is adopted, and after the explosive is filled, 1.2m of blocking sand is filled in an orifice.
The buffer hole 3 is sequentially filled with a first water ball bag 52, a first explosive, a second water ball bag 51, sand and soil filled at intervals, a second explosive, a third explosive and blocking sand and soil, and the device also comprises,
the buffer hole 3 is charged in two sections, two sections of explosive columns are respectively provided with one same section of time-delay high-precision detonator 31,
the bottom of the lower part is firstly provided with a first water ball bag 52 filled with water, the height of the first water ball bag 52 is 0.6-0.8 m,
45-55 kg of first explosive is coupled and loaded on the first water ball bag 52,
then a second water ball bag 51 with the height of 0.5m is pressed and covered,
then filling the mixture into sand soil 2-3 m at intervals,
then the upper part is loaded with powder, two kinds of cartridges with different diameters are loaded on the upper part, the lower part is provided with a second explosive, the second explosive is 20kg of cartridges with the diameter of 100mm, the upper part is provided with a third explosive, the third explosive is 15kg of cartridges with the diameter of 80mm,
finally, filling the blocking sand to the hole.
The method comprises the steps of sequentially filling emulsion explosive and blocking sand into a main blast hole 4,
the main blast holes 4 adopt continuous charging, a time-delay high-precision detonator 41 is arranged, 150-165 kg of charging is arranged in each main blast hole 4,
after the emulsion explosive is charged, filling the blocking sand to the hole.
The main blast holes 4 with the detonation N being 1 are detonated in sequence at the same time delay interval according to the sequence from small to large of the serial number N of the main blast holes 4, and the method also comprises the following steps,
after the pre-cracked hole 1 is detonated for 90ms, the main blast hole 4 with N being 1 is detonated,
and the rest main blast holes 4 are detonated in sequence at the same delay interval of 17ms according to the sequence from small to large of the serial number N of the main blast holes 4.
The buffer holes 3 are sequentially detonated at the same delay time interval according to the sequence of the numbers M of the buffer holes 3 from small to large, and the detonation of the buffer hole 3 with the number M of the buffer hole 3 needs to be completed after the detonation of the main gun hole 4 with the number N being M +2 and before the detonation of the main gun hole 4 with the number N being M +3,
after 42ms of detonation of the main gun hole 4 with N-1, the buffer hole 3 with M-1 is detonated,
and the buffer holes 3 are detonated in sequence at the same delay interval of 17ms according to the sequence of the numbers M of the buffer holes 3 from small to large.
Example two
A row of second main blast holes are arranged on the outer side of the main blast holes 4 in the direction of the slope 1 and parallel to the contour line of the slope 1, the second main blast holes are numbered in sequence from the initiation end of detonation, the number of the second main blast holes is marked as K,
the row spacing between the second main blast holes and the main blast holes 4 is 4.8-5.2 m,
after the pre-cracked hole 1 is detonated for 120ms, the second main blast holes with K equal to 1 are detonated, the other second main blast holes are detonated in sequence at the same delay interval of 17ms according to the sequence of the serial number K of the second main blast holes from small to large,
after the second main gun hole with K equal to 1 is detonated for 65ms, the main gun holes 4 with N equal to 1 are detonated, the rest main gun holes 4 are detonated in sequence from small to large according to the serial number N of the main gun holes 4 at the same delay interval of 17ms, the main gun holes 4 with the serial number N of the buffer holes 3 are detonated, after the main gun holes 4 with K equal to N +2 are detonated, and before the main gun holes 4 with K equal to N +3 are detonated,
after the main gun hole 4 with the number of N being 1 is detonated for 42ms, the buffer holes 3 with the number of M being 1 are detonated, the buffer holes 3 are detonated sequentially according to the sequence of the numbers M of the buffer holes 3 from small to large at the same delay interval of 17ms, and the detonation of the buffer hole 3 with the number of M of the buffer hole 3 needs to be performed after the main gun hole 4 with the number of N being M +1 is detonated and before the main gun hole 4 with the number of N being M +2 is detonated.
The rest is the same as the first embodiment.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (10)
1. A method for controlling blasting near the end of a slope is characterized by comprising the following steps,
step S1: arranging a row of pre-split holes along the edge slope contour line;
step S2: a row of buffer holes are arranged on the outer side of the pre-splitting hole in a direction parallel to the side slope contour line and towards the side slope, the buffer holes are numbered in sequence from the detonation initiating end, and the number of the buffer holes is marked as M;
step S3: a row of main gun holes are arranged on the outer side of the buffer hole in parallel to the side slope contour line and in the side slope direction, the main gun holes are numbered in sequence from the detonation initiating end, and the number of the main gun holes is marked as N;
step S4: sequentially loading water ball bags, explosives and blocking sand into the pre-splitting holes;
step S5: sequentially filling a first water ball bag, a first explosive, a second water ball bag, sand, a second explosive, a third explosive and blocking sand into the buffer hole;
step S6: sequentially filling emulsion explosive and blocking sand into the main blast hole;
step S7: detonating explosives in all the pre-cracked holes at one time;
step S8: detonating the main blast holes with N being 1, and sequentially detonating the other main blast holes at the same time delay interval according to the sequence of the main blast hole serial number N from small to large;
step S9: the buffer holes are sequentially detonated at the same delay intervals according to the sequence of the buffer hole numbers M from small to large, and the detonation of the buffer hole with the buffer hole number M needs to be performed after the detonation of the main gun hole with the N-M +2 and before the detonation of the main gun hole with the N-M + 3.
2. The near-end slope controlled blasting method according to claim 1, wherein a row of pre-split holes is arranged along the slope contour, further comprising,
the pre-splitting holes are arranged in a row, a curve formed by connecting adjacent pre-splitting holes is parallel to the contour line of the side slope, the distance between the adjacent pre-splitting holes is 1.5-2 m, the aperture is 130-150 mm, and the ultra-depth is 1.0-1.2 m.
3. The slope controlled blasting method according to claim 1, wherein a row of the buffer holes are formed in the outer side of the pre-split hole in parallel with the slope contour line toward the slope, and the buffer holes are numbered sequentially from the initiation end of detonation, the number of the buffer holes is denoted as M, and further comprising,
the row spacing between the buffer holes and the pre-splitting holes is 2.5-3 m, the spacing between adjacent buffer holes is 2.5-3 m, the aperture is 150mm, and the ultra-depth is 1.6-2.0 m.
4. The slope-approaching end controlled blasting method according to claim 1, wherein a row of main blastholes are provided outside the buffer holes in parallel with the slope contour line toward the slope, and the main blastholes are numbered in sequence from the initiation end of detonation, the number of the main blastholes being denoted as N, and further comprising,
the row spacing between the main blast holes and the buffer holes is 3-3.5 m, the spacing between the adjacent main blast holes is 5.5-6.0 m, the aperture is 150mm, and the ultra depth is 2.0-2.5 m.
5. The slope controlled blasting method near end according to claim 1, wherein water ball bags, explosives, and blocking sand are sequentially loaded into the pre-splitting holes, further comprising,
placing a water ball bag filled with water at the bottom of the pre-splitting hole, wherein the height of the water ball bag is 0.5-0.6 m; then carrying out pre-cracking hole explosive loading, wherein the linear density of the explosive loaded in the hole gradually decreases from bottom to top, the explosive loading linear density gradually transits from the bottom of 3kg/m to the top of 1kg/m,
the explosive is filled in the hole by adopting a full detonating cord structure, and after the explosive is filled, the blocking sand is filled in the hole opening by 1.2 m.
6. The near-end slope controlled blasting method according to claim 1, wherein the first water ball pocket, the first explosive, the second water ball pocket, the sand filled at intervals, the second explosive, the third explosive, the blocking sand are sequentially filled into the buffer hole, further comprising,
the buffer hole is charged in two sections, two sections of explosive columns are respectively provided with a same-section time-delay high-precision detonator,
the bottom of the lower part of the medicine-containing bag is firstly provided with a first water ball bag filled with water, the height of the first water ball bag is 0.6-0.8 m,
45-55 kg of first explosive is filled on the first water ball bag in a coupling manner,
then a second water ball bag with the height of 0.5m is pressed and covered,
then filling the mixture into sand soil 2-3 m at intervals,
then the upper part is loaded with powder, two kinds of cartridges with different diameters are loaded on the upper part, the lower part is provided with a second explosive, the second explosive is 20kg of cartridges with the diameter of 100mm, the upper part is provided with a third explosive, the third explosive is 15kg of cartridges with the diameter of 80mm,
finally, filling the blocking sand to the hole.
7. The near-end slope controlled blasting method according to claim 1, wherein the emulsion explosive and the clogging sand are sequentially charged into the main bore, further comprising,
the main gun holes are filled with continuous powder, 150-165 kg of powder is filled in each main gun hole,
after the emulsion explosive is charged, filling the blocking sand to the hole.
8. The slope controlled blasting method near end according to claim 1, wherein the main blastholes with N-1 are detonated, and the rest main blastholes are detonated in sequence at the same delay interval in the sequence from small to large according to the main blasthole number N, further comprising,
detonating the pre-cracked hole for 90ms, then detonating the main blast hole with N being 1,
and the other main gun holes are detonated in sequence at the same delay interval of 17ms according to the sequence of the main gun hole number N from small to large.
9. The near-end slope controlled blasting method according to claim 1, wherein the buffer holes are sequentially detonated at the same delay time interval in the order of the buffer hole number M from small to large, and the detonation of the buffer hole number M is required after the detonation of the main hole of N-M +2 and before the detonation of the main hole of N-M +3,
after 42ms of main hole detonation with N-1, the buffer hole with M-1 is detonated,
and the buffer holes are detonated in sequence at the same delay interval of 17ms according to the sequence of the buffer hole numbers M from small to large.
10. The slope-approaching end controlled blasting method according to claim 1, further comprising, in parallel with the slope contour line, arranging a row of second main blastholes outside the main blastholes in the direction of the slope, numbering the second main blastholes in sequence from the initiation end of detonation, numbering the second main blastholes as K,
the row spacing between the second main blast holes and the main blast holes is 4.8-5.2 m,
after the pre-cracked holes are detonated for 120ms, the second main blast holes with K equal to 1 are detonated, the other second main blast holes are detonated in sequence at the same delay interval of 17ms according to the sequence of the serial number K of the second main blast holes from small to large,
after the second main gun hole with K equal to 1 is detonated for 65ms, the main gun holes with N equal to 1 are detonated, the rest main gun holes are detonated in sequence according to the sequence of the main gun hole number N from small to large at the same delay interval of 17ms, the detonation of the main gun hole with the buffer hole number N needs to be detonated after the main gun hole with K equal to N +2 is detonated and before the main gun hole with K equal to N +3 is detonated,
and after the main gun hole with the number of N being 1 is detonated for 42ms, the buffer holes with the number of M being 1 are detonated, the buffer holes are sequentially detonated at the same delay interval of 17ms according to the sequence of the buffer hole numbers M from small to large, and the detonation of the buffer hole with the number of M is required to be after the main gun hole with the number of N being M +1 is detonated and before the main gun hole with the number of N being M +2 is detonated.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112696998A (en) * | 2020-12-29 | 2021-04-23 | 包头钢铁（集团）有限责任公司 | Controlled blasting forming method for foundation pit of open-pit mine crushing station |
| CN115325895A (en) * | 2022-09-20 | 2022-11-11 | 鹤庆北衙矿业有限公司 | Strip mine slope presplitting blasting layout mode |
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