CN113357982A - Hard rock strip mine blasting network design method - Google Patents
Hard rock strip mine blasting network design method Download PDFInfo
- Publication number
- CN113357982A CN113357982A CN202110563874.8A CN202110563874A CN113357982A CN 113357982 A CN113357982 A CN 113357982A CN 202110563874 A CN202110563874 A CN 202110563874A CN 113357982 A CN113357982 A CN 113357982A
- Authority
- CN
- China
- Prior art keywords
- blasting
- hard rock
- design method
- strip mine
- network design
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000005422 blasting Methods 0.000 title claims abstract description 37
- 239000011435 rock Substances 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000005474 detonation Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002360 explosive Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/04—Arrangements for ignition
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses a hard rock strip mine blasting network design method, which is characterized by comprising the following steps: 1) selecting 3-5 proximity coefficients; 2) the micro-difference interval time is selected to be 42-65 ms. In the invention, 1) the blasting energy is fully utilized, and the blast hole which is blasted first creates a good free surface for the blast hole which is blasted later, thereby realizing large-hole-pitch and small-row-pitch blasting. The free surface is fully utilized to be beneficial to overcoming the large resistance line. 2) The sizes of the resistance lines in all the detonation directions are ensured to be equal as much as possible.
Description
Technical Field
The invention relates to the technical field of blasting, in particular to a method for designing a blasting network of a strip mine.
Background
The deep hole blasting of the hard rock of the strip mine often causes the blasting pile to have lower loose degree, more large blocks or far flying stones due to the design deviation of a blasting network, brings great difficulty to subsequent work, such as low shoveling efficiency and influences the propelling speed; the flying stones are far away from bringing about blasting safety problems.
The prior blasting technology has the following defects:
1) the proximity coefficient is too low or too high, and the blasting effect on the hard rock of the strip mine is not ideal.
2) The poor time control is not good, which is not beneficial to the hard rock breaking.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for reasonably designing a hard rock blasting network of a strip mine and ensuring blasting safety and quality, and the specific technical scheme is as follows:
a method for designing blasting network of hard rock strip mine,
1) selecting 3-5 proximity coefficients;
2) the micro-difference interval time is selected to be 42-65 ms.
The invention has the advantages that:
1) the blasting energy is fully utilized, the blast holes exploded first create good free surfaces for the blast holes exploded later, and the large-hole-pitch and small-row-pitch blasting is realized. The free surface is fully utilized to be beneficial to overcoming the large resistance line.
2) The sizes of the resistance lines in the detonation directions are equal as much as possible.
Detailed Description
The terms to which the present invention relates are explained as follows:
open pit (open pit; open pit mine; surface mine): the operation mode of mining metal ore, coal and other non-metal ore deposits from the ground surface through downward stepped stripping;
blast area (blast area): a blasting area range;
step height of bench: the vertical distance between the bottom surface of the step and the plane of the top of the step;
root bottom (light bottom): after blasting, the rock mass remained at the bottom of the step and not blasted off;
(blast hole) row spacing (row spacing): distance between rows of blast holes;
(blast hole) circle spacing (ring spacing): distance between the perforation rings;
chassis resistance wire (toe burden; bench bottom burden): on the step, the horizontal distance from the axis of the blast hole to the bottom line of the slope is arranged outside;
proximity coefficient (proximity coefficient of holes): the ratio of the blasthole spacing to the line of least resistance;
differential blasting
Also called millisecond blasting, is a new blasting technology appeared in the 40 s. The detonator is filled with proper retardant or delay device connected with the priming circuit to realize the delay time interval, and the interval time of the series products is generally 13-25 milliseconds. Through the blasting network formed by different time differences, after one-time blasting, the explosive charges in each blast hole can be blasted in sequence according to the design requirement, and a good blasting effect is obtained.
The differential blasting is characterized in that the difference of the initiation time of each explosive charge is small, and the blasted rock blocks mutually impact in the moving process to form extremely complex energy redistribution, so that the rock is uniformly crushed, the throwing distance is shortened, the intensity of seismic waves and air shock waves is weakened, the blasting quality can be improved, nearby facilities cannot be damaged, the use efficiency of operating machinery can be improved, and the differential blasting has great economic benefit and is widely applied to mining and quarrying projects.
The difference of the detonation time of the explosives in the adjacent blast holes is the differential interval time;
taking a certain open pit mine as an example, the blasting piles in the conventional blasting area are not concentrated, the looseness is 1.2, and more large blocks are shown. In 1-11 months in 2020, using the explosion area of the network of the invention, 1) selecting 3-5 proximity coefficients; 2) the micro-difference interval time is selected to be 42-65 ms.
After blasting, the blasting pile is concentrated, the loose coefficient is improved to 1.4, and the blasting effect is obviously improved.
In the invention, 1) the blasting energy is fully utilized, and the blast hole which is blasted first creates a good free surface for the blast hole which is blasted later, thereby realizing large-hole-pitch and small-row-pitch blasting. The free surface is fully utilized to be beneficial to overcoming the large resistance line.
2) The sizes of the resistance lines in all the detonation directions are ensured to be equal as much as possible.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110563874.8A CN113357982A (en) | 2021-05-24 | 2021-05-24 | Hard rock strip mine blasting network design method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110563874.8A CN113357982A (en) | 2021-05-24 | 2021-05-24 | Hard rock strip mine blasting network design method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113357982A true CN113357982A (en) | 2021-09-07 |
Family
ID=77527358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110563874.8A Withdrawn CN113357982A (en) | 2021-05-24 | 2021-05-24 | Hard rock strip mine blasting network design method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113357982A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007096734A1 (en) * | 2006-02-20 | 2007-08-30 | Institute Of Communications And Information Technologies, Kyrgyz-Russian Slavic University | Method for drilling-and-blasting operations at open pits |
| CN102230769A (en) * | 2011-06-16 | 2011-11-02 | 汇通路桥建设集团有限公司 | Multi-row micro-differential roadbed deep hole blasting construction method |
| CN106123713A (en) * | 2016-06-30 | 2016-11-16 | 本钢板材股份有限公司 | A kind of opencut medium-length hole blasting bore distribution method and blasting method |
-
2021
- 2021-05-24 CN CN202110563874.8A patent/CN113357982A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007096734A1 (en) * | 2006-02-20 | 2007-08-30 | Institute Of Communications And Information Technologies, Kyrgyz-Russian Slavic University | Method for drilling-and-blasting operations at open pits |
| CN102230769A (en) * | 2011-06-16 | 2011-11-02 | 汇通路桥建设集团有限公司 | Multi-row micro-differential roadbed deep hole blasting construction method |
| CN106123713A (en) * | 2016-06-30 | 2016-11-16 | 本钢板材股份有限公司 | A kind of opencut medium-length hole blasting bore distribution method and blasting method |
Non-Patent Citations (2)
| Title |
|---|
| 王增平等: "会东铅锌矿露天台阶大孔距小抵抗线爆破技术的研究", 《矿业研究与开发》 * |
| 高士才等: "大孔距爆破技术与应用", 《爆破器材》 * |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210907 |
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| WW01 | Invention patent application withdrawn after publication |