CN110332866A - Single free-face combines blasthole kerf blasting method - Google Patents
Single free-face combines blasthole kerf blasting method Download PDFInfo
- Publication number
- CN110332866A CN110332866A CN201910614780.1A CN201910614780A CN110332866A CN 110332866 A CN110332866 A CN 110332866A CN 201910614780 A CN201910614780 A CN 201910614780A CN 110332866 A CN110332866 A CN 110332866A
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- China
- Prior art keywords
- blasthole
- blasting
- combination
- explosive
- kerf
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Classifications
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/04—Particular applications of blasting techniques for rock blasting
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses a kind of Single free-faces to combine blasthole kerf blasting method, the combination blasthole of multi-turn different distance including one explosion centre bore of arrangement and around explosion centre bore arrangement, decking and individually control detonation in blasthole, bottom-up stage delayed blasting is segmented according to explosive inside all blastholes, between two sections of explosive blastings delay in the blasthole of center, using center blasthole as starting point, all combination blastholes complete the delaying blasting of same section of explosive in the way of from inside to outside.The present invention use blasthole between and blasthole in combine delayed ignition, common explosive funnel can be formed, guarantee kerf blasting effect, detonation gas pressure action time in combination blasthole can be extended again, more energy are acted on into subsequent rock passage and throwing, single deck blast dose can also be greatly reduced, so that tradition be avoided to vibrate big disadvantage with section Cut Blasting.
Description
Technical field
The invention belongs to mine blasting technologies, and in particular to a kind of Single free-face combination blasthole kerf blasting method.
Background technique
The explosion item on only one scope of freedom is often faced in underground mine exploitation kerf blasting and upraise blasting engineering
Part.It is influenced by drilling machine construction precision, different degrees of deflection inevitably occurs in blasthole in deep hole Cut Blasting, to reduce big gun
Influence of the hole deflection to Cut Blasting effect provides Cut Blasting efficiency under Single free-face, a kind of common Cut Blasting method
Be by several blastholes form combination blasthole Same millisecond blasting, using combination blasthole between Explosive stress wave and detonation gas between it is mutual
Effect forms common explosive funnel, however, due to only having a scope of freedom, and explosion single hop dose is big, the Cut Blasting mode
Often cause strong vibrating effect, periphery rock mass and facilities and equipment are adversely affected.How Single free-face under slotting is reduced
Blasting vibration effect becomes a big technical problem.
Summary of the invention
Technical problem solved by the present invention is the defect big for blasting vibration under Single free-face, providing one kind can drop
The Single free-face of low blasting vibration combines blasthole kerf blasting method.
The present invention adopts the following technical scheme that realization:
Single free-face combines blasthole kerf blasting method, includes the following steps:
Step 1: arranging an intermediate hole at kerf blasting region midpoint, arranged outward centered on the intermediate hole
Several circles combine blasthole；
Step 2: explosive, the separately installed detonation of every section of explosive inside same blasthole are loaded in segmentation inside all blastholes
Detonator；
Step 3: it is segmented bottom-up stage delayed blasting according to explosive inside all blastholes, two in the blasthole of center
Between section explosive blasting delay, using center blasthole as starting point, all combination blastholes complete same section in the way of from inside to outside
The delaying blasting of explosive.
Further, all combination blastholes are from inside to outside during delaying blasting in the step 3, the institute of same circle
There is combination blasthole successively delaying blasting.
Further, the explosion extension time is set as 5-12ms between the combination blasthole of same circle.
Further, the explosion extension time is set as 25-30ms between the combination blasthole of adjacent turn.
Further, the upper-lower section adjacent explosive blasting extension time is set as 200-300ms inside all blastholes.
In Single free-face combination blasthole kerf blasting method of the invention, all blastholes are depth not less than 20m
Deep hole.
Further, the combination blasthole setting 4-8 is enclosed, and every circle is equidistantly evenly arranged 4-8 combination blasthole.
Further, the number of segment explosive that identical quantity is loaded inside all blastholes is 2-5 sections, different explosive sections in blasthole
Between use river sand interval.
Further, the detonating capsule uses minimum delay for the digital electric detonator of 1ms, to avoid short delaying blasting
There is string section.
In Single free-face combination blasthole kerf blasting method of the invention, when with delaying between a circle combination blasthole hole of group
Between the shorter than new scope of freedom of adjacent turn combination shot hole blasting form the time, enable and form common explosion leakage with the combination blasthole of group
Bucket.Also, it can effectively extend the effect of detonation gas pressure with the accurate short delaying blasting used between a circle combination blasthole hole of group
Time makes the initial crack around blasthole obtain sufficiently extending and penetrating through under the effect of detonation gas pressure, and more energy are made
For the passage of subsequent rock and throwing, be conducive to catalase.It is quick-fried with the short delay used between a circle combination blasthole hole of group
The broken time of delaying is greater than 5ms, moreover it is possible to effectively realize explosion drop vibration.
Compared with prior art, the present invention what is obtained has the beneficial effect that:
1. the present invention can not only form common explosion with the accurate short delaying blasting used between a circle combination blasthole hole of group
Funnel obtains the kerve effect similar with section kerf blasting with tradition, also can increase detonation gas pressure action time, will be more
Energy act on the passage of subsequent rock and throwing so that explosion and crushing lumpiness is more uniform.
2. the present invention replaces conventional combination blasthole Same millisecond blasting by using accurate short delaying blasting, significantly reduce quick-fried
Hong compressive load peak value, can be greatly reduced the blasting vibration peak of explosion near region rock, while can reduce by detonation pressure load
Vibration effect of explosion is greatly reduced in the high-frequency vibration component evoked, realization.
In conclusion the Single free-face combination blasthole kerf blasting method that the present invention uses, on the one hand short interval delay is quick-fried
The formation for breaking common explosive funnel between having no effect on combination blasthole, on the other hand to combine in blasthole by short delaying blasting
Single deck blast dose is greatly reduced in different blasthole delayed ignitions, reduces blasting vibration, overcomes kerf blasting under Single free-face and shakes
Move big defect.
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Detailed description of the invention
Fig. 1 is the combination steel for shot schematic diagram in embodiment.
Fig. 2 is the blasthole internal charge schematic diagram in embodiment.
Fig. 3 is the combination blasthole firing order schematic diagram in embodiment.
Specific embodiment
Embodiment
Referring to Fig. 1-3, it is illustrated as the specific embodiment party using Single free-face combination blasthole kerf blasting method of the invention
Formula.
Specifically as shown in Figure 1, the present embodiment arranges six circles combination blasthole in kerf blasting region.Combine the arrangement of blasthole
Steps are as follows: a center blasthole 1-1 being arranged first in the middle part of kerf blasting region, a circle is arranged centered on the center blasthole
The blasthole of four square orientation arrangements, above five blastholes form first lap and combine blasthole 1；Blasthole 1 is combined in first lap
The blasthole of four square orientation arrangements is enclosed in the setting one centered on the blasthole 1-1 of center outside, forms the second circle combination blasthole
2；Then the combination blasthole that gradually three circle of setting is arranged in octagon orientation centered on the blasthole 1-1 of center outward, difference shape
At the third circle combination circle of blasthole the 3, the 4th combination blasthole 4 and the 5th circle combination blasthole 5；Finally in outermost with center blasthole 1-1
Centered on arrangement four blastholes control kerf blasting boundaries the 6th circle combination blasthole 6.
In practical applications, 4-8 circle, every circle can be set according to the kerf blasting region area of onepull in combination blasthole
Equidistantly it is evenly arranged 4-8 combination blasthole.
All blasthole diameters are 165mm in the present embodiment, and depth is more than 20m, wherein the outer ring four of first lap combination blasthole 1
A blasthole is 1.2m, the second circle combination blasthole 2, the third circle combination circle combination big gun of blasthole the 3, the 4th with a distance from the blasthole 1-1 of center
Hole the 4, the 5th circle combination blasthole 5 and the 6th circle combination blasthole 6 it is all be respectively with a distance from the blasthole 1-1 of center 1.8m,
2.8m、4.0m、5.2m、6.6m。
Filling explosive is carried out to all blastholes after steel for shot.Specific step is as follows: using and divides inside all blastholes
Section filling explosive, as shown in Fig. 2, the burst region only has an explosion scope of freedom 12 of bottom one, blasthole pass through drilling machine from this
The explosion scope of freedom 12 drill, all blastholes be not less than on 20m to deep hole, three sections of filling explosives 7 of blasthole inner part, powder charge
Height 2.0m, burden 1.5m are spaced between explosive using river sand 9, and it is highly 2.5m that top filling 10, which equally uses river sand, with
It prevents that punching occurs in blasting process.A hair electric detonator 8 detonation is filled by payment to a porter 11 inside every section of explosive, electric detonator is
Minimum delay time is the digital electric detonator of 1ms, realizes that every section of explosive individually detonates.Explosive section can be according to the depth of blasthole
It is calculated, it is general to select 2-5 sections.
Detonation finally is controlled according to whole firing order from inside to outside, from bottom to top to the blasthole that powder charge is completed.Specifically
Blasting process is as follows: being segmented bottom-up stage delayed blasting according to explosive inside blasthole, two sections of explosives in the blasthole of center
Between explosion delay, using center blasthole as starting point, all combination blastholes complete same section of explosive in the way of from inside to outside
Delaying blasting, and all combination blastholes of same circle successively delaying blasting.In the present embodiment, between every circle combination blasthole
The short delaying blasting of 5ms is used between blasthole, the time of delaying between the group of adjacent turn combination blasthole is 50ms, and the upper section of each blasthole is fried
Medicine is than the delay 300ms detonation of lower section explosive.Kerf blasting hole detonation extension time and single hop dose in the present embodiment see the table below:
In practical blasting process, according to the number of the boring hole of arrangement, the explosion extension time exists between the combination blasthole of same circle
It is chosen between 5-12ms, explosion delays the time in 25-30ms selection, blasthole inside upper-lower section phase between the combination blasthole of adjacent turn
The adjacent explosive blasting extension time is chosen in 200-300ms.
Shown using the live demolition effect that the present embodiment carries out quick-fried using Single free-face combination blasthole kerve of the invention
Broken method, kerf blasting effect is high, and blast fragmentation size is uniform, quick-fried with traditional boulder yield compared with section kerf blasting reduction by 40%
Broken vibration peak reduces by 50% or more.
It should be clear that described above is only the embodiment of the present invention, it is not intended to limit the invention, it is all
Within technical solution of the present invention and principle, changes, equivalent replacement, improvement etc., belong to protection of the present invention
Within the scope of.
Claims (9)
1. Single free-face combines blasthole kerf blasting method, it is characterised in that include the following steps:
Step 1: arranging an intermediate hole at kerf blasting region midpoint, arranged outward centered on the intermediate hole several
Circle combination blasthole；
Step 2: explosive, the separately installed detonating capsule of every section of explosive inside same blasthole are loaded in segmentation inside all blastholes；
Step 3: being segmented bottom-up stage delayed blasting according to explosive inside all blastholes, two sections in the blasthole of center are fried
Between medicine explosion delay, using center blasthole as starting point, all combination blastholes complete same section of explosive in the way of from inside to outside
Delaying blasting.
2. Single free-face according to claim 1 combines blasthole kerf blasting method, all combination big guns in the step 3
Hole is from inside to outside during delaying blasting, all combination blastholes of same circle successively delaying blasting.
3. Single free-face according to claim 2 combines blasthole kerf blasting method, quick-fried between the combination blasthole of same circle
The broken time of delaying is set as 5-12ms.
4. Single free-face according to claim 3 combines blasthole kerf blasting method, quick-fried between the combination blasthole of adjacent turn
The broken time of delaying is set as 25-30ms.
5. Single free-face according to claim 4 combines blasthole kerf blasting method, upper-lower section is adjacent inside all blastholes
The explosive blasting extension time is set as 200-300ms.
6. Single free-face according to any one of claims 1-5 combines blasthole kerf blasting method, all blastholes are
Depth is not less than the deep hole of 20m.
7. Single free-face according to claim 6 combines blasthole kerf blasting method, the combination blasthole setting 4-8 is enclosed,
Every circle is equidistantly evenly arranged 4-8 combination blasthole.
8. Single free-face according to claim 7 combines blasthole kerf blasting method, identical number is loaded inside all blastholes
The number of segment explosive of amount is 2-5 sections, uses river sand interval between different explosive sections in blasthole.
9. Single free-face according to claim 8 combines blasthole kerf blasting method, the detonating capsule is prolonged using minimum
When for 1ms digital electric detonator.
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| CN201910614780.1A CN110332866A (en) | 2019-07-09 | 2019-07-09 | Single free-face combines blasthole kerf blasting method |
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| CN201910614780.1A CN110332866A (en) | 2019-07-09 | 2019-07-09 | Single free-face combines blasthole kerf blasting method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113720226A (en) * | 2021-08-31 | 2021-11-30 | 玉溪大红山矿业有限公司 | Small-section upward blind raise one-shot blasting well-forming blast hole arrangement structure and method |
| CN114086960A (en) * | 2022-01-21 | 2022-02-25 | 矿冶科技集团有限公司 | Forming method of cutting groove |
| CN114199090A (en) * | 2021-12-09 | 2022-03-18 | 安徽铜冠（庐江）矿业有限公司 | Deep hole groove-drawing top-breaking gangue return-free charging structure and operation method thereof |
| CN115355785A (en) * | 2022-09-15 | 2022-11-18 | 中南大学 | Sectional blasting well completion method considering blast hole deflection |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113720226A (en) * | 2021-08-31 | 2021-11-30 | 玉溪大红山矿业有限公司 | Small-section upward blind raise one-shot blasting well-forming blast hole arrangement structure and method |
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| CN114199090A (en) * | 2021-12-09 | 2022-03-18 | 安徽铜冠（庐江）矿业有限公司 | Deep hole groove-drawing top-breaking gangue return-free charging structure and operation method thereof |
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| CN115355785A (en) * | 2022-09-15 | 2022-11-18 | 中南大学 | Sectional blasting well completion method considering blast hole deflection |
| CN115355785B (en) * | 2022-09-15 | 2024-04-19 | 中南大学 | Sectional blasting well forming method considering blast hole deflection |
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