CN107843156A - Gallery（Tunnel）The method of driving enhancing Cut Blasting efficiency - Google Patents
Gallery（Tunnel）The method of driving enhancing Cut Blasting efficiency Download PDFInfo
- Publication number
- CN107843156A CN107843156A CN201610833732.8A CN201610833732A CN107843156A CN 107843156 A CN107843156 A CN 107843156A CN 201610833732 A CN201610833732 A CN 201610833732A CN 107843156 A CN107843156 A CN 107843156A
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- hole
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- charge hole
- tunnel
- surrounding
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- 238000005422 blasting Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000002708 enhancing effect Effects 0.000 title claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 64
- 239000002360 explosive Substances 0.000 claims abstract description 24
- 239000011435 rock Substances 0.000 claims abstract description 21
- 238000005474 detonation Methods 0.000 claims abstract description 15
- 238000009412 basement excavation Methods 0.000 claims abstract description 8
- 238000005553 drilling Methods 0.000 claims abstract description 8
- 230000000977 initiatory effect Effects 0.000 claims abstract description 6
- 230000000694 effects Effects 0.000 claims description 15
- 239000002893 slag Substances 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000011800 void material Substances 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 2
- 239000004575 stone Substances 0.000 claims description 2
- 238000004880 explosion Methods 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 102000016938 Catalase Human genes 0.000 description 3
- 108010053835 Catalase Proteins 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005728 strengthening Methods 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
-
- 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)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The present invention relates to a kind of gallery（Tunnel）The method of driving enhancing Cut Blasting efficiency, in tunnel（Tunnel）Four emptying apertures perpendicular to a diameter of 78mm of the scope of operation of middle and lower part Drilling in excavation operation face, one a diameter of 50mm of center arrangement of emptying aperture line powder charge hole, detonated as first section hole, center using emptying aperture line is the equally distributed 4 a diameter of 50mm of center of circle Drilling on circumference of the radius as 40cm powder charge hole, and four powder charge holes are detonated as the second section；The technical scheme is by the way of indirect initiation, middle powder charge hole and the powder charge hole of surrounding are by the way of hole-bottom blast, igniting primer is arranged at blasthole bottom, and the sockets for collecting energy of detonator sockets for collecting energy and Explosive roll is towards outside hole, so that the direction of propagation of explosive detonation ripple and the direction of throwing rock are consistent, on the one hand it can ensure that rock is completely broken, on the other hand can ensure explosive blasting energy more by outside fragmented rock ejection aperture, so as to effectively lift Cut Blasting efficiency.
Description
Technical field
The present invention relates to a kind of gallery（Tunnel）The method of driving enhancing Cut Blasting efficiency, belongs to gallery（Tunnel）Driving
Method and technology field.
Background technology
In the prior art, the excavated section of iron ore underground development heading is about 23.16 ㎡, and driving method is that burn cut is quick-fried
Broken, rock clipping is larger, and blasthole aperture is small, and average blast hole depth average out to 3.0m, blast hole utilizing factor is all within 83%, also
The blasthole for having 17% is not efficiently used, and the demolition effect of snubber directly affects whole driving single cycle and drivage efficiency, right
Conclusive effect is played in the consumption of excavation cost, the quality of Cut Blasting effect, mainly see in the range of slotting whether according to
Expected depth requirements are come out by complete throwing, create the preferable cavity scope of freedom.
The content of the invention
The present invention is exactly for technical problem present in prior art, there is provided a kind of gallery（Tunnel）Driving enhancing slotting
The method of blasting efficiency, the technical scheme are primarily adapted for use in light section, small-bore, shallow bore hole digging laneway（Tunnel）Driving, both broke
Face is typically in 20m2To 30m2, in below 50mm, hole depth can be effectively improved in the burn cut of 3m-4m tunnelling in aperture
Cut Blasting effect, improves single cycle drivage efficiency, and technical scheme innovation proposes more excellent compensating space in blasting, using anti-
Optimize demolition effect to detonation mode while introduce " three light shot technologies " in Cut Blasting, driving can be effectively improved and drawn
Groove blasting efficiency, 91%, and then General Promotion tunnelling single cycle efficiency can be brought up to by 83% before, it is contemplated that can save
Yuan/year of excavation cost 117.34 ten thousand.
To achieve these goals, technical scheme is as follows, a kind of gallery（Tunnel）Driving enhancing Cut Blasting
The method of efficiency, it is characterised in that the described method comprises the following steps：1）In tunnel（Tunnel）Bore the middle and lower part in excavation operation face
Dig four emptying apertures perpendicular to a diameter of 78mm of the scope of operation, one a diameter of 50mm of center arrangement of emptying aperture line powder charge
Hole, detonated as first section hole, the center using emptying aperture line is equally distributed 4 of center of circle Drilling on circumference of the radius as 40cm
A diameter of 50mm powder charge hole, four powder charge holes are detonated as the second section；
2）Powder charge hole ultra-deep 20cm-30cm of the four 78mm emptying aperture than the 50mm of surrounding, four 78mm in centre void depth
Equal, the powder charge hole depth of central charge hole and surrounding is equal, and emptying aperture and central charge hole and the powder charge hole of surrounding are parallel to each other；
3）Four 78mm blasthole is emptying aperture, not powder charge, and the powder charge hole of central charge hole and surrounding is powder charge hole；
4）Behind central charge hole and the powder charge hole of surrounding filling sticked explosive and Nonel detonator, filling stemming blocks blasthole hole
Mouthful, filling length is 40cm-50cm, and emptying aperture plays reinforcement rock than the powder charge hole ultra-deep 20cm-30cm of central charge hole and surrounding
Stone throws the effect of slag effect, and rock is dished out completely, effectively improves Cut Blasting effect, described emptying aperture is than center blasthole and four
The powder charge hole ultra-deep 20cm in week.
As a modification of the present invention, the step 4）It is middle by the way of indirect initiation, middle powder charge hole and surrounding
Powder charge hole by the way of hole-bottom blast, igniting primer is arranged at blasthole bottom, and detonator sockets for collecting energy and Explosive roll
Sockets for collecting energy towards outside hole.Ensure after detonation explosive detonation ripple towards outside hole so that the direction of propagation of explosive detonation ripple and
The direction of throwing rock is consistent, and on the one hand can be ensured that rock is completely broken, on the other hand can be ensured explosive blasting energy
Amount is more by outside fragmented rock ejection aperture, so as to effectively lift Cut Blasting efficiency.
As a modification of the present invention, in step 1, Cut Blasting uses a diameter of 45mm drill steel, a diameter of 32mm
The bore bit of powder stick and a diameter of 48mm, borehole driving precision on the one hand can be improved, optimizes borehole Forming Quality, on the one hand can be with
Explosive specific charge is reduced, reduces explosive cost；Influence of the explosion to the clipping of rock can above all be reduced, it is final to realize
The lifting of Cut Blasting efficiency.
Relative to prior art, the invention has the advantages that, 1）The technical program is using central charge hole as first section
Hole detonate, through centre four emptying apertures, for surrounding powder charge hole provide expansion the scope of freedom be compensation space；2）In the program
For the powder charge hole explosive of surrounding as second segment and when being detonated with section, middle by explosion is that the scope of freedom increases surrounding through emptying aperture
The explosion of powder charge hole the scope of freedom, reached by the catalase in the range of slotting, throw slag purpose；3）Four in the technical scheme
Individual emptying aperture can strengthen the rock thrown results of keyhole foundation, incite somebody to action than the powder charge hole ultra-deep 20cm-30cm of center blasthole and surrounding
Rock slag in the range of slotting is dished out completely, and stemming is loaded in the powder charge hole aperture of surrounding, can ensure that slotting is quick-fried with section detonation
Broken effect, prevent explosive from the blasting failure such as going out；4）The technical scheme provides more excellent compensating space in blasting：The powder charge hole at center
As first section hole detonate, through centre four emptying apertures, by centre spatial area by four emptying aperture areas of plane before by
0.02m2 is increased to 0.06m2, and the volume of middle cavity is increased to 0.192m3 by 0.064m3（The area of plane and void depth
Product）, increase 3 times（Refer to figure below：The front and rear contrast floor map of central charge hole 2# holes detonation）, for the powder charge hole of surrounding
It is compensation space to provide the scope of freedom expanded, and the explosion penalty coefficient for the powder charge hole offer of surrounding is increased to by 0.45 before
0.68, by expanding effective compensation space volume, increase explosion penalty coefficient, the explosive in the powder charge hole of surrounding uses second segment
Position and when detonate with section, reaches the purpose by the catalase in slotting region and throwing slag, to realize Cut Blasting efficiency
Lifting.
Brief description of the drawings
Fig. 1 is the process structure schematic diagram of the present invention；
Fig. 2 is Fig. 1 A-A profiles；
Fig. 3 is indirect initiation charge explosion structural plan schematic diagram；
Fig. 4 is the front and rear contrast floor map of central charge hole 2# holes detonation；
Fig. 5 is Cut Blasting detonation overall process floor map；
In figure：1st, central charge hole；2nd, emptying aperture；3rd, surrounding powder charge hole；4th, country rock；5th, Nonel detonator, 6, sticked explosive, 7,
Stemming, 8, detonating primer.
Embodiment：
In order to deepen the understanding of the present invention, the present embodiment is described in detail below in conjunction with the accompanying drawings.
Embodiment 1：Referring to Fig. 1, Fig. 2, a kind of gallery（Tunnel）The method of driving enhancing Cut Blasting efficiency, methods described
Comprise the following steps：1）In tunnel（Tunnel）Four a diameter of 78mm perpendicular to the scope of operation of middle and lower part Drilling in excavation operation face
Emptying aperture 1, one a diameter of 50mm of center arrangement of emptying aperture line powder charge hole 2, as first section hole detonate, with emptying aperture line
Center is the center of circle in the powder charge hole 3 that radius is the equally distributed 4 a diameter of 50mm of Drilling on 40cm circumference, four powder charge holes
Detonated as the second section；
2）Powder charge hole 3 ultra-deep 20cm-30cm of the four 78mm emptying aperture 1 than the 50mm of surrounding, middle four 78mm emptying aperture are deep
Spend equal, the powder charge hole depth of central charge hole and surrounding is equal, emptying aperture and central charge hole and the powder charge hole of surrounding（3# holes）
It is parallel to each other；
3）Four 78mm blasthole is emptying aperture 2, not powder charge, central charge hole 2）Powder charge hole 3 with surrounding is powder charge hole.
4）Behind central charge hole 2 and the powder charge hole 3 of surrounding filling sticked explosive 6 and Nonel detonator 5, filling stemming 7 is stifled
Blasthole aperture is filled in, filling length is 40cm-50cm, and emptying aperture rises than the powder charge hole ultra-deep 20cm-30cm of central charge hole and surrounding
To the effect for strengthening rock throwing slag effect, rock is dished out completely, effectively improves Cut Blasting effect, described emptying aperture compares center
The powder charge hole ultra-deep 20cm of blasthole and surrounding.
Referring to Fig. 3, the step 4）It is middle by the way of indirect initiation, the powder charge hole 3 of middle powder charge hole 2 and surrounding is adopted
With the mode of hole-bottom blast（Refer to figure below indirect initiation charge explosion structural representation）, igniting primer is arranged at blasthole bottom
Portion, and the sockets for collecting energy of detonator sockets for collecting energy and Explosive roll is towards outside hole.Ensure after detonation explosive detonation ripple towards outside hole, so as to
The direction of propagation of explosive detonation ripple and the direction of throwing rock are consistent, on the one hand can ensure that rock is completely broken, separately
On the one hand it can ensure that explosive blasting energy more by outside fragmented rock ejection aperture, is imitated so as to effectively lift Cut Blasting
Rate.
Referring to Fig. 4, Fig. 5, the technical scheme provides more excellent compensating space in blasting, and the powder charge hole at center is risen as first section hole
It is quick-fried, four emptying apertures through centre, the spatial area of centre is increased to by four emptying aperture areas of plane before by 0.02m2
0.06m2, the volume of middle cavity are increased to 0.192m3 by 0.064m3（The product of the area of plane and void depth）, increase 3
Times, the front and rear contrast floor map of central charge hole 2# holes detonation）, for surrounding powder charge hole provide expand the scope of freedom be compensation
Space, the explosion penalty coefficient for the powder charge hole offer of surrounding are increased to 0.68 by 0.45 before, pass through and expand effective mend
Spatial volume is repaid, increases explosion penalty coefficient, when the explosive in the powder charge hole of surrounding uses the second section and detonated with section, reaches
By the catalase in slotting region and throw slag purpose, to realize the lifting of Cut Blasting efficiency.
Introduce three light shot technologies in the Cut Blasting of step 1, Cut Blasting using a diameter of 45mm drill steel, a diameter of
The bore bit of 32mm powder sticks and a diameter of 48mm, borehole driving precision on the one hand can be improved, optimizes borehole Forming Quality, on the one hand
Explosive specific charge can be reduced, reduces explosive cost；Influence of the explosion to the clipping of rock can above all be reduced, finally
Realize the lifting of Cut Blasting efficiency.
Application Example：Present invention specific implementation is by Nanjing Meishan Metallurgy Co., Ltd. of Baoshan Iron and Steel Group Mining Industry Subsidiary Company
Cai Zhun subsidiary factories construct according to scheme, attempt to implement in underground -288m, -318m, -330m, the horizontal completions of -348m in this way
About 8100m tunnelling, driving single cycle drilling depth were also lifted to 2.73m/ big guns, slotting efficiency by the 2.3m/ big guns of 2014
Also by 83% lifting before to 91%, excavation cost（Material spare part expense is only included, not including labour cost）About
39.7127 member/m3, Mining Industry Subsidiary Company underworkings size is 6m*4.1m, and every meter of tunnel is about 23.16m3Ore, plan are annual
Save excavation cost about altogether（8100/2.3-8100/2.73)*2.3*23.16m3/ m*39.7127 members/m3It is=117.34 ten thousand yuan, long
Phase effectively reduces driving production cost using meeting.
It should be noted that above-described embodiment, is not used for limiting protection scope of the present invention, in above-mentioned technical proposal
On the basis of made equivalents or replacement each fall within the scope that the claims in the present invention are protected.
Claims (3)
- A kind of 1. gallery（Tunnel）The method of driving enhancing Cut Blasting efficiency, it is characterised in that methods described includes following step Suddenly：1）In tunnel（Tunnel）Four emptying apertures perpendicular to a diameter of 78mm of the scope of operation of middle and lower part Drilling in excavation operation face, it is empty One a diameter of 50mm of center arrangement of hole line powder charge hole, detonated as first section hole, using the center of emptying aperture line as the center of circle The equally distributed 4 a diameter of 50mm of the Drilling powder charge hole on the circumference that radius is 40cm, four powder charge holes are as second segment Position detonation；2）Powder charge hole ultra-deep 20cm-30cm of the four 78mm emptying aperture than the 50mm of surrounding, four 78mm in centre void depth Equal, the powder charge hole depth of central charge hole and surrounding is equal, and emptying aperture and central charge hole and the powder charge hole of surrounding are parallel to each other；3）Four 78mm blasthole is emptying aperture, not powder charge, and the powder charge hole of central charge hole and surrounding is powder charge hole；4）Behind central charge hole and the powder charge hole of surrounding filling sticked explosive and Nonel detonator, filling stemming blocks blasthole hole Mouthful, filling length is 40cm-50cm, and emptying aperture plays reinforcement rock than the powder charge hole ultra-deep 20cm-30cm of central charge hole and surrounding Stone throws the effect of slag effect, and rock is dished out completely, effectively improves Cut Blasting effect, described emptying aperture is than center blasthole and four The powder charge hole ultra-deep 20cm in week.
- 2. gallery according to claim 1（Tunnel）The method of driving enhancing Cut Blasting efficiency, it is characterised in that described Step 4）It is middle by the way of indirect initiation, the powder charge hole of middle powder charge hole and surrounding by the way of hole-bottom blast, detonation Pack is arranged at blasthole bottom, and the sockets for collecting energy of detonator sockets for collecting energy and Explosive roll is towards outside hole.
- 3. gallery according to claim 1（Tunnel）The method of driving enhancing Cut Blasting efficiency, it is characterised in that step In 1, Cut Blasting using a diameter of 45mm drill steel, a diameter of 32mm powder sticks and a diameter of 48mm bore bit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610833732.8A CN107843156A (en) | 2016-09-20 | 2016-09-20 | Gallery（Tunnel）The method of driving enhancing Cut Blasting efficiency |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610833732.8A CN107843156A (en) | 2016-09-20 | 2016-09-20 | Gallery（Tunnel）The method of driving enhancing Cut Blasting efficiency |
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| CN107843156A true CN107843156A (en) | 2018-03-27 |
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| CN201610833732.8A Pending CN107843156A (en) | 2016-09-20 | 2016-09-20 | Gallery（Tunnel）The method of driving enhancing Cut Blasting efficiency |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110260731A (en) * | 2019-06-19 | 2019-09-20 | 山东金鼎矿业有限责任公司 | A kind of simultaneous shaft sin king construction method for drop shaft, cutting well |
| CN110285728A (en) * | 2019-07-29 | 2019-09-27 | 华侨大学 | A kind of slotting pore structure and method in Tunnel Blasting excavation work |
| CN110345820A (en) * | 2019-07-09 | 2019-10-18 | 谢俊 | A kind of straight eye blasting technique of auxiliary slotting |
| CN111457800A (en) * | 2020-04-14 | 2020-07-28 | 郑州信息科技职业学院 | Straight-eye barrel-shaped cutting hole arrangement structure and roadway straight-eye barrel-shaped cutting blasting method thereof |
| CN112229283A (en) * | 2020-09-21 | 2021-01-15 | 中铁十六局集团第三工程有限公司 | Tunnel center groove hole distribution blasting method |
| CN112257009A (en) * | 2020-08-31 | 2021-01-22 | 北京科技大学 | Method for determining depth of cut hole for blasting tunneling of rock roadway |
| CN112595192A (en) * | 2021-01-14 | 2021-04-02 | 大冶有色金属有限责任公司 | Variable-diameter cut structure and method for roadway excavation |
| CN112880499A (en) * | 2021-02-01 | 2021-06-01 | 中交路桥北方工程有限公司 | Smooth blasting method for tunnel weak surrounding rock |
| CN113188384A (en) * | 2021-04-20 | 2021-07-30 | 白银有色集团股份有限公司 | Cutting parameter optimization method based on rock hardness classification |
| CN114963904A (en) * | 2022-06-13 | 2022-08-30 | 中交第二公路工程局有限公司 | Tunnel blast hole structure based on directional energy-gathering slotted hole and blasting method |
| CN115200437A (en) * | 2022-07-11 | 2022-10-18 | 中国矿业大学(北京) | Double-major-diameter hollow hole bottom energy-collecting cut blasting method |
| CN115325894A (en) * | 2022-08-31 | 2022-11-11 | 中铁十八局集团有限公司 | Three-order cut blasting structure and blasting method for ultra-hard rock tunnel |
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| CN102494572A (en) * | 2011-12-21 | 2012-06-13 | 鞍钢集团矿业公司 | Blasting method for undermining and tunnelling in mode of distributing hollow holes at periphery and solid hole in center |
| CN202836383U (en) * | 2012-10-08 | 2013-03-27 | 江西稀有稀土金属钨业集团有限公司 | Mine heading cutting blast hole structure |
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110260731B (en) * | 2019-06-19 | 2021-08-13 | 山东金鼎矿业有限责任公司 | One-time well construction method for drop shaft and cutting well |
| CN110260731A (en) * | 2019-06-19 | 2019-09-20 | 山东金鼎矿业有限责任公司 | A kind of simultaneous shaft sin king construction method for drop shaft, cutting well |
| CN110345820A (en) * | 2019-07-09 | 2019-10-18 | 谢俊 | A kind of straight eye blasting technique of auxiliary slotting |
| CN110285728A (en) * | 2019-07-29 | 2019-09-27 | 华侨大学 | A kind of slotting pore structure and method in Tunnel Blasting excavation work |
| CN111457800A (en) * | 2020-04-14 | 2020-07-28 | 郑州信息科技职业学院 | Straight-eye barrel-shaped cutting hole arrangement structure and roadway straight-eye barrel-shaped cutting blasting method thereof |
| CN112257009B (en) * | 2020-08-31 | 2023-07-11 | 北京科技大学 | Method for determining depth of cut hole of rock roadway blasting tunneling |
| CN112257009A (en) * | 2020-08-31 | 2021-01-22 | 北京科技大学 | Method for determining depth of cut hole for blasting tunneling of rock roadway |
| CN112229283B (en) * | 2020-09-21 | 2023-05-05 | 中铁十六局集团第三工程有限公司 | Hole distribution blasting method for tunnel center groove |
| CN112229283A (en) * | 2020-09-21 | 2021-01-15 | 中铁十六局集团第三工程有限公司 | Tunnel center groove hole distribution blasting method |
| CN112595192B (en) * | 2021-01-14 | 2023-03-14 | 大冶有色金属有限责任公司 | Variable-diameter cut structure and method for roadway excavation |
| CN112595192A (en) * | 2021-01-14 | 2021-04-02 | 大冶有色金属有限责任公司 | Variable-diameter cut structure and method for roadway excavation |
| CN112880499A (en) * | 2021-02-01 | 2021-06-01 | 中交路桥北方工程有限公司 | Smooth blasting method for tunnel weak surrounding rock |
| CN113188384A (en) * | 2021-04-20 | 2021-07-30 | 白银有色集团股份有限公司 | Cutting parameter optimization method based on rock hardness classification |
| CN113188384B (en) * | 2021-04-20 | 2023-03-03 | 白银有色集团股份有限公司 | Cut parameter optimization method based on rock hardness classification |
| CN114963904A (en) * | 2022-06-13 | 2022-08-30 | 中交第二公路工程局有限公司 | Tunnel blast hole structure based on directional energy-gathering slotted hole and blasting method |
| CN114963904B (en) * | 2022-06-13 | 2023-12-15 | 中交第二公路工程局有限公司 | Tunnel blasting hole structure based on directional energy-gathering slotted holes and blasting method |
| CN115200437A (en) * | 2022-07-11 | 2022-10-18 | 中国矿业大学(北京) | Double-major-diameter hollow hole bottom energy-collecting cut blasting method |
| CN115200437B (en) * | 2022-07-11 | 2023-09-26 | 中国矿业大学(北京) | Double large diameter hollow hole bottom energy collecting and cutting blasting method |
| CN115325894A (en) * | 2022-08-31 | 2022-11-11 | 中铁十八局集团有限公司 | Three-order cut blasting structure and blasting method for ultra-hard rock tunnel |
| CN115325894B (en) * | 2022-08-31 | 2023-08-29 | 中铁十八局集团有限公司 | Third-order cut blasting structure and blasting method for ultra-hard rock tunnel |
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Application publication date: 20180327 |