AU2021102155A4 - Safe and efficient construction method for deep hole vibration reduction blasting of deep shaft frozen bedrock - Google Patents
Safe and efficient construction method for deep hole vibration reduction blasting of deep shaft frozen bedrock Download PDFInfo
- Publication number
- AU2021102155A4 AU2021102155A4 AU2021102155A AU2021102155A AU2021102155A4 AU 2021102155 A4 AU2021102155 A4 AU 2021102155A4 AU 2021102155 A AU2021102155 A AU 2021102155A AU 2021102155 A AU2021102155 A AU 2021102155A AU 2021102155 A4 AU2021102155 A4 AU 2021102155A4
- Authority
- AU
- Australia
- Prior art keywords
- blasting
- frozen
- deep
- holes
- shaft
- 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.)
- Ceased
Links
- 238000005422 blasting Methods 0.000 title claims abstract description 80
- 238000010276 construction Methods 0.000 title claims abstract description 39
- 239000002360 explosive Substances 0.000 claims abstract description 50
- 238000005553 drilling Methods 0.000 claims abstract description 17
- 230000008014 freezing Effects 0.000 claims abstract description 14
- 238000007710 freezing Methods 0.000 claims abstract description 14
- 239000011435 rock Substances 0.000 claims description 11
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 8
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 8
- 241001330002 Bambuseae Species 0.000 claims description 8
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 8
- 239000011425 bamboo Substances 0.000 claims description 8
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 claims description 5
- 230000002528 anti-freeze Effects 0.000 claims description 5
- 230000037452 priming Effects 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 13
- 238000004904 shortening Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D1/00—Sinking shafts
- E21D1/10—Preparation of the ground
- E21D1/12—Preparation of the ground by freezing
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D8/00—Shafts not provided for in groups E21D1/00 - E21D7/00
-
- 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
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/02—Arranging blasting cartridges to form an assembly
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The present disclosure discloses a safe and efficient construction method for deep hole vibration
reduction blasting of a deep shaft frozen bedrock specifically relates to a fast advancing
construction method for differential smooth blasting in surrounding deep holes of a shaft frozen
bedrock without affecting safe operation of a frozen layer or a frozen pipe. To overcome the
shortcomings of low efficiency, long construction period and high cost caused by the fact that
only shallow hole blasting can be used for haft frozen bedrocks under normal circumstances, a
bedrock deep hole differential blasting construction method matching a shaft freezing method is
provided. In the method, deep holes are drilled at one time, and surrounding holes are charged
with explosives section by section to form surrounding hole charging structures to implement
differential smooth blasting in the holes, thereby reducing blasting vibration, effectively
protecting the safety of a frozen pipe and a frozen wall, improving the drilling and blasting work
efficiency, accelerating the construction progress, shortening the construction period, and
exerting the mechanization efficiency of equipment.
Description
[0001] The present disclosure relates to a safe and efficient construction method for deep hole vibration reduction blasting of a deep shaft frozen bedrock, and specifically relates to a fast advancing construction method for differential smooth blasting in surrounding deep holes of a shaft frozen bedrock without affecting normal operation of a frozen layer or a frozen pipe.
[0002] A deep shaft frozen bedrock is constructed by a drilling and blasting method, which must ensure the safety of a frozen pipe and avoid frozen pipe breakage and saline water outflow to quickly freeze a frozen wall such that the pipe is scraped and cannot continue to implement freezing; and the method must ensure the safety of the frozen wall and avoid frozen wall collapse such that external water surges into the shaft to cause shaft submergence accidents. Therefore, Coal Mine Safety Regulations (2014 edition), Standard for Construction of Shaft and Roadway of Coal Mine and Quality Acceptance Specifications (GB50511, GB50213-2010), and Code for Acceptance of Sinking and Drifting Engineering of Ferrous Mines (draft) all agree that ammonium nitrate explosives or antifreeze safety explosives should be used, the distance between a blasting hole and a frozen pipe should not be less than 1.2 m, and the depth of a blasting hole in a bedrock layer should not be more than 1.8 m; segmental detonators should be used for full-section blasting, and the charging length of a surrounding blasting hole should not be more than 1/2 of the depth of the hole during smooth blasting. The drilling and blasting construction of the current shaft frozen bedrock in China still relies on shallow hole drilling, less explosive charging and vibration blasting. This seriously limits the exertion of integrated mechanization efficiency, and greatly affects construction speed and economic benefits, so that the shaft freezing period is extended and the freezing cost is increased.
[0003] The objective of the present disclosure is to overcome the above shortcomings of low efficiency, long construction period and high cost caused by the fact that only shallow hole blasting can be used in order to prevent a frozen layer or a frozen pipe from being blasted in freezing blast construction of a deep shaft, a bedrock deep hole differential blasting construction method matching a shaft freezing method is provided. In the method, deep holes are drilled at one time, and surrounding holes are charged with explosives section by section to implement differential smooth blasting in the holes, thereby reducing blasting vibration, effectively protecting the safety of a frozen pipe and a frozen wall, improving the drilling and blasting work efficiency, accelerating the construction progress, shortening the construction period, and exerting the mechanization efficiency of equipment; and the construction is safe, economic, and practical.
[0004] The technical solution of the present disclosure is: in order to achieve the above objective of the present disclosure, a safe and efficient construction method for deep hole vibration reduction blasting of a deep shaft frozen bedrock is carried out in accordance with the following steps:
[0005] ( Peripheral bedrock of a shaft is drilled and frozen according to the design requirements.
[0006] @ The drilling depth of common shallow hole blasting of a shaft frozen bedrock is increased more than double by 4.0 to 4.2 meters from a maximum depth not more than 1.8 meters.
[0007] © Holes are drilled with an FJD-6.7 umbrella drill and six YGZ-70 rail type independent rotating rock drills, a T220 rock antifreeze water-gel explosive and a No. 3 waterproof coil mine ammonium nitrate explosive having specifications of $45mmx400mmx0.8Kg and 32mmx170mmx150g respectively are selected, and 6.Om long lead millisecond delay electric detonators are used.
[0008] @ After cutting holes are formed, the explosives are charged according to the general deep hole blasting design; after surrounding holes are formed, a priming explosive is bound with the explosive of the detonator to a 2.5m long bamboo chip by two continuous sections of detonator, the distance between two sections of explosives is about 1.1 meters, the bamboo chip is closely attached to shaft outside, and the holes are all blocked by stemming.
[0009] The blasting delay time in the surrounding holes is less than 25 ms.
[0010] A large parallel connection manner is used, the charging connection is completed, the shaft is hoisted, a frozen pipe and a frozen pipe gate valve are closed, and then blasting is performed with a blaster.
[0011] The present disclosure has the following advantages and positive effects:
[0012] 1. The mechanized operation using an umbrella drill for drilling holes is fast in hole formation, and the drilling process takes a short time.
[0013] 2. The shaft frozen bedrock is constructed by a deep hole smooth blasting method, the blasting holes having depths of 4.2 m, which is 2.4 m more than the depth 1.8 m required by the construction specification, and the single advancing depth in the shaft is 2.3 times that of shallow hole blasting, so the construction progress is increased by multiples.
[0014] 3. After the deep hole blasting is used, the work efficiency of operation machines for drilling, mucking and removing is also greatly improved, and the use cost of the machines is reduced.
[0015] 4. Surrounding holes are drilled deep and charged section by section, and differential smooth blasting is implemented in one hole, such that the explosive quantity for each blasting in the surrounding holes is effectively controlled, which ensures the smooth blasting effect, reduces blasting vibration, and effectively ensures the safety of a frozen pipe and a frozen wall.
[0016] 5. The shaft construction period is greatly shortened, and the cost of freezing is saved.
[0017] 6. The economic efficiency is good, the cost of a construction organization can be significantly reduced, and the work efficiency is greatly improved.
[0018] In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the accompanying drawings required in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, and a person of ordinary skill in the art can still derive other drawings according to these accompanying drawings without creative efforts.
[0019] FIG. 1 is a plan view of deep hole blasting design of a shaft freezing method.
[0020] FIG. 2 is a side view of deep hole blasting design of the shaft freezing method.
[0021] FIG. 3 is a schematic diagram of a surrounding hole cartridge.
[0022] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.
[0023] A safe and efficient construction method for deep hole vibration reduction blasting of a deep shaft frozen bedrock specifically relates to a fast advancing construction method for differential smooth blasting in surrounding deep holes of a shaft frozen bedrock without affecting safe operation of a frozen layer or a frozen pipe. To overcome the shortcomings of low efficiency, long construction period and high cost caused by the fact that only shallow hole blasting can be used for shaft frozen bedrocks under normal circumstances, a bedrock deep hole differential blasting construction method matching a shaft freezing method is provided. In the method, deep holes are drilled at one time, and surrounding holes are charged with explosives section by section to form surrounding hole charging structures to implement differential smooth blasting in the holes, thereby reducing blasting vibration, effectively protecting the safety of a frozen pipe and a frozen wall, improving the drilling and blasting work efficiency, accelerating the construction progress, shortening the construction period, and exerting the mechanization efficiency of equipment. A construction method of differential blasting in deep surrounding holes of a shaft frozen bedrock is carried out in accordance with the following steps: 0 Freezing construction is performed on a shaft peripheral bedrock according to the design requirements. @ The drilling depth of common shallow hole blasting of a shaft frozen bedrock is increased more than double by 4.0 to 4.2 meters from a maximum depth not more than 1.8 meters. © Holes are drilled with an FJD-6.7 umbrella drill and six YGZ-70 rail type independent rotating rock drills, a T220 rock antifreeze water-gel explosive and a No. 3 waterproof coil mine ammonium nitrate explosive having specifications of ©45mmx400mmx0.8Kg and ©D32mmx170mmx150g respectively are selected, and 6.0m long lead millisecond delay electric detonators are used. @ After cutting holes are formed, the explosives are charged according to the general deep hole blasting design; after surrounding holes are formed, a priming explosive is bound with the explosive of the detonator to a 2.5m long bamboo chip by two continuous sections of detonator, the distance between two sections of explosives is about 1.1 meter, the bamboo chip is closely attached to shaft outside, and the holes are all blocked by stemming. @ The blasting delay time in the surrounding holes is less than 25 ms. @ A large parallel connection manner is used. As the charging connection is completed, the shaft is hoisted, a frozen pipe and a frozen pipe gate valve are closed, and then blasting is performed with a blaster.
[0024] Deep holes are formed at one time, surrounding holes are charged with explosives section by section, and differential smooth blasting is implemented in the holes, thereby reducing blasting vibration and effectively protecting the safety of the frozen pipe and the frozen wall.
[0025] Deep holes are drilled at one time, surrounding holes are charged with explosives section by section, and differential smooth blasting is implemented in the holes, such that the drilling depth of common shallow hole blasting usually adopted for a shaft frozen bedrock is increased more than double by 4.0 to 4.2 meters from a maximum depth not more than 1.8 meters, the blasting efficiency is improved to 2.3 times that of the shallow hole blasting, and the construction progress is increased by multiples.
[0026] After the deep hole blasting is used, the work efficiency of operation machines for drilling, mucking and removing is also greatly improved, and the use cost of the machines is reduced.
[0027] The advance rate of the shaft is improved by multiples, the total construction period of the shaft is significantly shortened, and the cost of freezing is saved.
[0028] A surrounding hole cartridge includes explosives, an electric detonator, a detonating tube, a delay tube, and a stemming; the explosives are configured in two groups, with one group inside, and the other group outside; the stemming is filled between the two groups of explosives, and the explosives and the stemming are arranged in the electric detonator; the delay tube is arranged at the top between the two groups of explosives; the detonating tube is connected to the outside explosive.
[0029] A construction method of differential smooth blasting in deep surrounding holes of a shaft frozen bedrock is carried out in accordance with the following steps: 0 Normal deep hole blasting design is performed according to a shaft design drawing, and relevant parameters of blasting are detailed, as shown in FIGS. 1 and 2, to form a blasting design drawing, cutting holes having depths of 4.2 m, and auxiliary holes and surrounding holes having depths of 4.0 m. @ After a freezing process is completed, holes are drilled with an FJD-6.7 umbrella drill and six YGZ-70 rail type independent rotating rock drills according to the blasting design drawing, wherein the drilling angle and depth should meet the requirements of blasting design. @ After the holes formed are inspected and cutting holes are formed, explosives are charged according to the general deep hole blasting design; after the surrounding holes are formed, a priming explosive is bound with the explosive of a detonator to a 2.5m long bamboo chip by two continuous sections of detonator, the distance between two sections of explosives is about 1.1 meters, the bamboo chip is closely attached to shaft outside, and the holes are all blocked by stemming. @ The blasting delay time of the two sections of explosives in the surrounding holes is less than 25 ms. @ The blasting connection manner is large parallel connection, the charging connection is completed, the shaft is hoisted, a frozen pipe and a frozen pipe gate valve are closed, and then blasting is performed with a blaster. (Blasting parameters, initial blasting conditions and effects of Xingdong auxiliary shaft are shown in the following table)
[0030] Parameter design table of differential smooth blasting in 4.0m deep surrounding holes of frozen bedrock of Xingdong auxiliary shaft
C) M) o)
tia)
t)
6a)
S 0~
ti) ti tim
04k
0ti)'1
= a) C) C) C) oc
ati
tj 2P u -C,3
tiim
[0032] Initial conditions and effects of differential smooth blasting in 4.Om deep surrounding holes of frozen bedrock of Xingdong auxiliary shaft
No. Name Unit Quantity No. Name Unit Quantity 1 Excavated m2 47.78 9 Hole utilization % 90 section 2 Net m2 28.27 10 Advancing depth per cycle m 3.6 section 3 Rock f 4-8 11 Detonator per cycle piece 149 hardness 4 FJD-6.7 piece 1 12 Detonator for per meter of piece/m 41.3 umbrella shaft drill YGZ-70 piece 6 13 Rock blasted per cycle m 172.0 rock drill 6 Explosive T220 rock 14 Explosive Water-gel kg 204.8 type antifreeze consumption water-gel per cycle explosive No. 3 Ammonium kg 72.9 waterproof coil nitrate mine ammonium nitrate explosive 7 Number piece 102 Total kg 277.7 of holes per cycle 8 Drilling m 411.6 15 Explosive consumption kg/m 3 1.61 length per per unit cycle
[0033] It should be understood that although the present description is described in terms of the implementation, not every implementation includes only one separate technical solution, and such a description mode of the description is merely for the sake of clarity. A person skilled in the art should take the description as a whole, and the technical solutions in all the embodiments may be appropriately combined to form other implementations that can be understood by a person skilled in the art.
Claims (3)
1. A safe and efficient construction method for deep hole vibration reduction blasting of a deep shaft frozen bedrock, carried out in accordance with the following steps: performing freezing construction on a shaft peripheral bedrock according to the design requirements; increasing the drilling depth of common shallow hole blasting of a shaft frozen bedrock by more than double from a maximum depth not more than 1.8 meters; drilling holes with an FJD-6.7 umbrella drill and six YGZ-70 rail type independent rotating rock drills, selecting a T220 rock antifreeze water-gel explosive and a No. 3 waterproof coil mine ammonium nitrate explosive having specifications of ©45mmx4OOmmxO.8Kg and ©D32mmx170mmx150g respectively, and using 6.Om long lead millisecond delay electric detonators; after cutting holes are formed, charging the explosives according to the general deep hole blasting design; after surrounding holes are formed, binding a priming explosive with the explosive of the detonator to a 2.5m long bamboo chip by two continuous sections of detonator, the distance between two sections of explosives being about 1.1 meters, the bamboo chip being closely attached to shaft outside, and the holes being blocked by stemming; the blasting delay time in the surrounding holes being less than 25 ms; and using a large parallel connection manner, completing the charging connection, hoisting the shaft, closing a frozen pipe and a frozen pipe gate valve, and then blasting with a blaster.
2. The safe and efficient construction method for deep hole vibration reduction blasting of a deep shaft frozen bedrock according to claim 1, wherein deep holes are drilled at one time, surrounding holes are charged with explosives section by section, and differential smooth blasting is implemented in the holes.
3. The safe and efficient construction method for deep hole vibration reduction blasting of a deep shaft frozen bedrock according to claim 2, wherein a surrounding hole cartridge comprises explosives, an electric detonator, a detonating tube, a delay tube, and a stemming; the explosives are configured in two groups, with one group inside, and the other group outside; the stemming is filled between the two groups of explosives, and the explosives and the stemming are arranged in the electric detonator; the delay tube is arranged at the top between the two groups of explosives; the detonating tube is connected to the outside explosive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021102155A AU2021102155A4 (en) | 2021-04-22 | 2021-04-22 | Safe and efficient construction method for deep hole vibration reduction blasting of deep shaft frozen bedrock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021102155A AU2021102155A4 (en) | 2021-04-22 | 2021-04-22 | Safe and efficient construction method for deep hole vibration reduction blasting of deep shaft frozen bedrock |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2021102155A4 true AU2021102155A4 (en) | 2021-08-12 |
Family
ID=77195560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2021102155A Ceased AU2021102155A4 (en) | 2021-04-22 | 2021-04-22 | Safe and efficient construction method for deep hole vibration reduction blasting of deep shaft frozen bedrock |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2021102155A4 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114674188A (en) * | 2022-05-12 | 2022-06-28 | 辽宁科技学院 | Staged charging method for frozen blast hole |
| CN116658178A (en) * | 2023-07-31 | 2023-08-29 | 中铁十七局集团第五工程有限公司 | Ultra-small clear distance tunnel subsection differential blasting vibration reduction and isolation construction method |
-
2021
- 2021-04-22 AU AU2021102155A patent/AU2021102155A4/en not_active Ceased
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114674188A (en) * | 2022-05-12 | 2022-06-28 | 辽宁科技学院 | Staged charging method for frozen blast hole |
| CN114674188B (en) * | 2022-05-12 | 2024-03-26 | 辽宁科技学院 | Graded charging method for frozen ice blast holes |
| CN116658178A (en) * | 2023-07-31 | 2023-08-29 | 中铁十七局集团第五工程有限公司 | Ultra-small clear distance tunnel subsection differential blasting vibration reduction and isolation construction method |
| CN116658178B (en) * | 2023-07-31 | 2023-10-13 | 中铁十七局集团第五工程有限公司 | Ultra-small clear distance tunnel subsection differential blasting vibration reduction and isolation construction method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2021102155A4 (en) | Safe and efficient construction method for deep hole vibration reduction blasting of deep shaft frozen bedrock | |
| CN102808622B (en) | Method for recovering ore pillar by medium-length hole and deep hole combined blasting technology | |
| CN107764144A (en) | A kind of tunnel Millisecond Controlled Blasting method | |
| CN100564803C (en) | Rock lane digging method | |
| CN105823387A (en) | Rapid construction method for deep hole blasting of vertical shaft frozen bedrock | |
| CN103499255A (en) | Method for directional energy-gathered blasting of retaining wall with low damage | |
| CN101864961B (en) | Method for actively preventing and controlling rock burst | |
| CN101266123B (en) | Crushing station pit digging method | |
| CN103575172A (en) | Novel roadway blasting construction method | |
| CN106930766A (en) | Great burying TBM construction tunnel rock burst processing structures | |
| CN108362179A (en) | A kind of energy saving cut shot method of star | |
| CN104596375A (en) | Fully mechanized excavation construction method for rock roadway | |
| CN104613831A (en) | Construction method for additionally forming periphery auxiliary holes in periphery of vertical shaft periphery hole | |
| CN104296609B (en) | Containing the controlled blasting method of different hardness rock stratum in Deep hole bench balsting | |
| CN111397455A (en) | Combined detonation method for accurately controlling blasting effect in tunneling | |
| CN103697775A (en) | Method of loose blasting by high-pressure water jet helical cutting | |
| CN209230424U (en) | A kind of compound burn cut | |
| CN102620614B (en) | Cave depot is slagged tap the construction method of funnel | |
| CN103307941B (en) | A kind of method improving road driving Cut Blasting effect | |
| WO2023103256A1 (en) | Deep hole vibration-reduction blasting method based on artificial freezing of weak surrounding rock in deep shaft | |
| CN106813540A (en) | The method of Shaft Freezing rock section deep hole blasting under ultra low temperature state | |
| CN102927863B (en) | A kind of new method of total rock tunnel blasting construction | |
| CN112964143B (en) | Three-time blasting method for hollow hole straight-hole cut | |
| CN112832796B (en) | TBM cutter head, TBM and hard rock cracking TBM tunneling method | |
| CN113107583A (en) | Thick and hard roof high-gas coal seam gas extraction system and extraction method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |