CN106545344B - A kind of Karst area tunnel wall-hanging country rock face blast excavation method - Google Patents
A kind of Karst area tunnel wall-hanging country rock face blast excavation method Download PDFInfo
- Publication number
- CN106545344B CN106545344B CN201611121977.4A CN201611121977A CN106545344B CN 106545344 B CN106545344 B CN 106545344B CN 201611121977 A CN201611121977 A CN 201611121977A CN 106545344 B CN106545344 B CN 106545344B
- Authority
- CN
- China
- Prior art keywords
- reliever
- row
- eye
- periphery hole
- country rock
- 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.)
- Expired - Fee Related
Links
- 239000011435 rock Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000009412 basement excavation Methods 0.000 title claims abstract description 17
- 230000035939 shock Effects 0.000 claims abstract description 40
- 238000005422 blasting Methods 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 8
- 238000005474 detonation Methods 0.000 claims abstract description 7
- 238000010304 firing Methods 0.000 claims abstract description 6
- 238000004880 explosion Methods 0.000 claims description 9
- 239000002360 explosive Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000006378 damage Effects 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 241001300078 Vitrea Species 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 210000003608 fece Anatomy 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001550 time effect Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- 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)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a kind of Karst area tunnel wall-hanging country rock face blast excavation method, borehole design is located at the periphery hole in country rock on the reliever and contour line of equally distributed arcuation；First row reliever is arranged since the wall built-up country rock bottom；From first row reliever, equidistant three rows reliever is arranged in contour line direction from inside to outside；Shock dropping eye is set between reliever；Arrange that periphery hole, periphery hole are equally spaced in edge high density, intermediate routine in contour line region；Uncoincided charge is carried out to reliever and periphery hole, different coefficient of charge powder charges are respectively adopted from periphery hole in reliever；Reliever and periphery hole are coupled using parallel network, and millisecond detonating is controlled using detonating tube detonation system；Firing order according to reliever from inside to outside, sequence of the periphery hole from centre to both sides.The present invention efficiently controls blasting effect on the basis of conventional blast, maximization reduction profile backbreaks and disturbed with karst dead zone while ensureing construction quality and economic benefit.
Description
Technical field
The present invention relates to a kind of tunnel excavation methods, quick-fried more particularly, to a kind of Karst area tunnel wall-hanging country rock section
Broken excavation method.
Background technology
Under normal conditions, Highway Tunnel Construction, which excavates driving, to take drilling and blasting method to construct, although Technology of Blasting
Certain benefit can be brought from cost and for engineering on the duration, but since conventional blast strength control difficulty is big, and can be to enclosing
Rock generation largely disturbs, to be suitable for the Tunnel Engineering of some special geologic conditions.
Currently, with the southern expansion construction westwards of China Higher grade highway, Tunnel Engineering will inevitably encounter rock
Molten location.In rare super-huge karst area, by the karst Regional Geological Conditions complex that tunnel is passed through, for tunnel
It is very careful that the excavation of road karst section needs, and the solution cavity that conventional conventional blast is likely to result in large area caves in and tunnel contour
It backbreaks phenomenon, blasting effect how is efficiently controlled on the basis of conventional blast, maximizing reduces that profile is backbreak and karst is empty
Area disturbs, while ensureing construction quality and economic benefit, it has also become a new challenge of karst section Tunnel Blasting construction.
Invention content
Technical problem to be solved by the invention is to provide one kind efficiently controlling explosion effect on the basis of conventional blast
It answers, maximize the Karst area tunnel extension that reduction profile backbreaks with the disturbance of karst dead zone while ensureing construction quality and economic benefit
Wall type country rock face blast excavation method.
In order to solve the above technical problem, the present invention provides Karst area tunnel wall-hanging country rock face blast excavation side
Method includes the following steps：
The first step, according to conditions such as geologic prediction, excavated section shape, existing explosive, vibration velocity requirements to wall-hanging
Country rock section carries out borehole design, and the borehole design includes being located at equally distributed arcuation reliever and profile in country rock
Periphery hole on line omits snubber process since the large area karst dead zone scope of freedom exists；
Second step arranges first row reliever since the wall built-up country rock bottom；
Third walks, and from first row reliever, equidistant three rows reliever, that is, second row is arranged in contour line direction from inside to outside
Reliever, third row's reliever and the 4th row's reliever；
4th step, is arranged shock dropping eye between reliever, and first row shock dropping eye is located at the second row reliever and third
Between arranging reliever, second row shock dropping eye is located between third row's reliever and the 4th row's reliever, and third arranges shock dropping eye
Between periphery hole and the 4th row's reliever；
5th step arranges that periphery hole, the periphery hole equidistantly divide in edge high density, intermediate routine in contour line region
Cloth；Uncoincided charge is carried out to reliever and periphery hole, the reliever is respectively adopted different coefficient of charges from periphery hole and fills
Medicine；
Reliever and periphery hole are coupled using parallel network, and control elementary errors using detonating tube detonation system by the 6th step
Detonation；
7th step, firing order according to reliever from inside to outside, sequence of the periphery hole from centre to both sides, corresponding detonator section
It does not detonate successively.
In above-mentioned steps seven, blasting method is smooth surface short-delay blasting method.
The reliever uniform specification is Φ 40mm, and eye depth 2.8m adjacent row spacing is 100cm, with the reliever arranged
Spacing is 90cm.
The quick-fried layer thickness of light between the periphery hole and the reliever is 62.5cm.
The spacing of the first row shock dropping eye, second row shock dropping eye and the similar reliever is 40cm；It is described
Third row's shock dropping eye and the spacing of the adjacent periphery hole be 30cm.
The shock dropping eye specification is Φ 40mm, and eye depth is 4m, and the spacing with the shock dropping eye of row is 90cm.
The periphery hole arrangement specification is periphery hole edge high density eye spacing 30cm, the eye spacing of periphery hole middle area
60cm。
The powder charge uses 2# rock dynamites, and the coefficient of charge of the reliever is q=0.35kg/m, described
The edge compact district coefficient of charge of periphery hole is q=0.15kg/m, and the middle area coefficient of charge of the periphery hole is q=
0.2kg/m。
The detonator uses non-electric ms detonator propagation of explosion, and non-electrical instantaneous cap is used in hole.
While using low dose, using non-electrical msdelayed light emission detonator, it is coupled successively from inside to outside with parallel network, phase
The millisecond detonating time is 100ms between the adjacent reliever, and the millisecond detonating time is 20ms, institute between the reliever
The millisecond detonating time for the periphery hole edge high density eye stated is 0.5-1ms, when the middle area millisecond detonating of the periphery hole
Between be 1-2ms, the millisecond detonating time of the intensive eye in periphery hole edge and intermediate eye is 10ms.
Characteristic and advantageous effect of the present invention：
First, the characteristics of taking full advantage of existing karst dead zone section saves slotting process, passes through the cloth on contour line
Edge high density periphery hole is set, low dose dense holes can reduce disturbance destruction and the tunnel of explosion both sides karst dead zone to the greatest extent
Road contour line is backbreak；At the same time two rows of shock dropping eyes are set between reliever, specifically in the areas Guang Baoceng arrangement third row
Shock dropping eye makes attenuation of seismic waves that refraction, reflection occur, effectively weakens seismic wave energy by three drain holes, quick-fried to reduce
Broken vibration velocity reaches reduction and disturbs purpose to karst dead zone.
Secondly, reliever and periphery hole are all made of Uncoincided charge, using lower under conditions of ensureing smooth explosion
Concentration of charge matches the shock dropping eye between reliever, on the one hand can significantly reduce Explosive Vibrating Velocity, on the other hand utilizes pre-
Splitting the principle of explosion reduces the quick-fried diameter for falling country rock, avoids the difficult required secondary blasting of bulk country rock slagging-off.
Finally, while using low dose, using non-electrical msdelayed light emission detonator, joined successively from inside to outside with parallel network
Knot, the millisecond detonating time is 100ms between adjacent reliever, and the millisecond detonating time is 20ms between via hole, and periphery hole edge is highly dense
The millisecond detonating time for spending eye is 0.5-1ms, and the periphery hole middle area millisecond detonating time is 1-2ms, periphery hole edge high density
The millisecond detonating time of eye and intermediate eye is 10ms, coordinates low dose and shock dropping eye by this intersection timesharing detonation, most effective
Controlled blasting effect in ground reduces the damage of karst and country rock, has ensured construction safety.
Description of the drawings
Fig. 1 is Karst Tunnel wall-hanging country rock sectional schematic diagram.
Fig. 2 is explosion borehole and shock dropping eye arrangement schematic diagram.
Fig. 3 is firing order schematic diagram.
Fig. 4 is blasting network schematic diagram.
In figure：1- first rows reliever, 2- second rows reliever, 3- first row shock droppings eye, 4- thirds row reliever, 5- the
Two row's shock dropping eyes, the 4th row's relievers of 6-, 7- thirds row's shock dropping eye, 8- periphery holes edge compact district, 9- periphery holes middle area, A
→ D-reliever fuze action zone, E → F-periphery holes fuze action zone, 10- solution cavities dead zone, the backfill of the dead zones 11-, 12- detonators.
Specific implementation mode
In order to it is apparent it is clear introduce technical solution according to the present invention, further illustrate below in conjunction with the accompanying drawings.
The present embodiment schematic diagram is shown in Fig. 1 to Fig. 3, and in Fig. 1,10 be solution cavity dead zone, and 11 backfill for dead zone, tunnel contour line with
Karst dead zone infall is highly prone to blast working disturbance, and there are security risks；In Fig. 2, empty ocular shows shock dropping eye, solid eye according to
Secondary is reliever and periphery hole；In Fig. 3, the number of hole edge mark is that blasting cap correspondent section is other.The present embodiment is only illustrative
, it is not to be limited as the scope of the present invention.
Referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the wall-hanging country rock face blast excavation method of Karst area tunnel, detailed step
It is as follows：
The first step, according to conditions such as geologic prediction, excavated section shape, existing explosive and vibration velocity requirements to wall-hanging
Country rock section carry out borehole design, borehole design include be located at excavated section country rock in equally distributed arcuation reliever and
Periphery hole on contour line omits snubber process, and since the large area karst dead zone scope of freedom exists by single cycle
Drilling depth control is 3.0m or less.
Second step arranges first row reliever 1 since the wall-hanging country rock bottom；
Third walks, and from first row reliever 1, the arrangement equidistant three rows reliever of arcuation in contour line direction is from inside to outside
Second row shock dropping eye 2, third row's reliever 4 and the 4th row's reliever 6；
Shock dropping eye is arranged in 4th step between reliever, and first row shock dropping eye 3 is located at second row shock dropping eye 2 and third row is auxiliary
It helps between eye 4, the spacing of first row shock dropping eye 3 and second row shock dropping eye 2 is 40cm；It is auxiliary that second row shock dropping eye 5 is located at third row
It helps between eye 4 and the 4th row's reliever 6, second row shock dropping eye 5 and the spacing of third row's reliever 4 are 40cm；Third arranges shock dropping
For eye 7 between periphery hole and the 4th row's reliever 6, it is 30cm that third, which arranges shock dropping eye 7 and the spacing of the 4th row's reliever 6,；
5th step arranges that periphery hole, periphery hole edge high density Vitrea eye 8 are arranged in dense holes, week in contour line region
Side eye middle area 9 is in conventional equidistant placement；Uncoincided charge is carried out to reliever and periphery hole, reliever is adopted respectively with periphery hole
With different coefficient of charge powder charges；
Reliever and periphery hole are coupled by the 6th step using parallel network, and micro- using the control of 12 initiation system of detonator
Difference detonation；
7th step, explosion use smooth surface short-delay blasting method, firing order according to reliever from inside to outside, periphery hole is by centre
To both sides, corresponding detonator section is not detonated successively.
Specifically, reliever uniform specification is Φ 40mm, and eye depth 2.8m adjacent row spacing is 100cm, with the reliever of row
Spacing be 90cm.
Shock dropping eye uniform specification is Φ 40mm, eye depth 4m, empty eye spacing 90cm.
Periphery hole uniform specification is Φ 40mm, eye depth 2.5m, the eye spacing 30cm of periphery hole edge compact district 8, periphery hole
The eye spacing 60cm of middle area 9, the quick-fried layer thickness of light are 62.5cm.
It is 32 × 200mm of φ that powder charge, which uses 2# rock dynamites, powder stick specification, and Uncoincided charge coefficient is 1.25, auxiliary
It is q=0.35kg/m to help a coefficient of charge, and the coefficient of charge of periphery hole edge compact district 8 is q=0.15kg/m, among periphery hole
The coefficient of charge in area 9 is q=0.2kg/m.
Firing order is to be detonated successively by the areas A to the areas F with reference to figure 3, between adjacent reliever row the millisecond detonating time be
100ms, the millisecond detonating time is 20ms between reliever, and the millisecond detonating time of reliever to periphery hole is 40-50ms, periphery hole
The millisecond detonating time of 8 each eye of edge compact district is 0.5-1ms, and the millisecond detonating time of periphery hole middle area 9 is 1-2ms,
The millisecond detonating time of the periphery hole of periphery hole edge compact district 8 and the periphery hole of periphery hole middle area 9 is 10ms.
The above is specific implementation mode of the present invention, special by arranging on the basis of conventional blast
Shock dropping eye between the intensive eye in periphery and row, cooperation do not couple low dose powder charge, reach controlled blasting with the specific millisecond detonating time
Effect reduces country rock and backbreaks and the disturbance of karst dead zone and damage, but the invention is not limited in the wall-hanging country rock explosions referred to
Construction can be widely used in the special karst face blast construction of karst landform underground engineering according to physical condition.
Claims (8)
1. a kind of Karst area tunnel wall-hanging country rock face blast excavation method, it is characterized in that：Include the following steps：
The first step, it is disconnected to wall-hanging country rock according to geologic prediction, excavated section shape, existing explosive and vibration velocity requirement condition
Face carries out borehole design, and the borehole design includes being located in country rock on the reliever and contour line of equally distributed arcuation
Periphery hole；
Second step arranges first row reliever since the wall built-up country rock bottom；
Third walks, and from first row reliever, equidistant three rows reliever, that is, second row auxiliary is arranged in contour line direction from inside to outside
Eye, third row's reliever and the 4th row's reliever；
Shock dropping eye is arranged in 4th step between reliever, and first row shock dropping eye is located at the second row reliever and third row is auxiliary
It helps between eye, second row shock dropping eye is located between third row's reliever and the 4th row's reliever, and third row's shock dropping eye is located at
Between periphery hole and the 4th row's reliever；
5th step arranges that periphery hole, the periphery hole are equally spaced in edge high density, intermediate routine in contour line region；
Uncoincided charge is carried out to reliever and periphery hole, different coefficient of charge powder charges are respectively adopted from periphery hole in the reliever；
Reliever and periphery hole are coupled using parallel network, and control millisecond detonating using detonating tube detonation system by the 6th step；
7th step, firing order according to reliever from inside to outside, sequence of the periphery hole from centre to both sides, corresponding detonator section not according to
Secondary detonation；
The powder charge uses 2# rock dynamites, and the coefficient of charge of the reliever is q=0.35kg/m, the periphery
The edge compact district coefficient of charge of eye is q=0.15kg/m, and the middle area coefficient of charge of the periphery hole is q=0.2kg/m；
While using low dose, using non-electrical msdelayed light emission detonator, it is coupled successively from inside to outside with parallel network, it is adjacent auxiliary
The millisecond detonating time is 100ms between helping eye to arrange, and the millisecond detonating time is 20ms between reliever, and the edge of the periphery hole is intensive
The millisecond detonating time of eye is 0.5-1ms, and the middle area millisecond detonating time of the periphery hole is 1-2ms, the periphery
The millisecond detonating time of the intensive eye in edge of eye and intermediate eye is 10ms.
2. wall-hanging country rock face blast excavation method in Karst area tunnel according to claim 1, it is characterized in that：It is above-mentioned
In step 7, blasting method is smooth surface short-delay blasting method.
3. wall-hanging country rock face blast excavation method in Karst area tunnel according to claim 1 or 2, it is characterized in that：
The reliever uniform specification is Φ 40mm, and eye depth 2.8m adjacent row spacing is 100cm, and the spacing with the reliever of row is
90cm。
4. wall-hanging country rock face blast excavation method in Karst area tunnel according to claim 2, it is characterized in that：It is described
Periphery hole and the reliever between the quick-fried layer thickness of light be 62.5cm.
5. wall-hanging country rock face blast excavation method in Karst area tunnel according to claim 1 or 2, it is characterized in that：
The spacing of the first row shock dropping eye, second row shock dropping eye and the similar reliever is 40cm；The third row
The spacing of shock dropping eye and the adjacent periphery hole is 30cm.
6. wall-hanging country rock face blast excavation method in Karst area tunnel according to claim 1 or 2, it is characterized in that：
The shock dropping eye specification is Φ 40mm, and eye depth is 4m, and the spacing with the shock dropping eye of row is 90cm.
7. wall-hanging country rock face blast excavation method in Karst area tunnel according to claim 1 or 2, it is characterized in that：
The periphery hole arrangement specification is the eye spacing 30cm, the eye spacing 60cm of periphery hole middle area of periphery hole edge compact district.
8. wall-hanging country rock face blast excavation method in Karst area tunnel according to claim 1 or 2, it is characterized in that：
The detonator uses non-electric ms detonator propagation of explosion, and non-electrical instantaneous cap is used in hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611121977.4A CN106545344B (en) | 2016-12-08 | 2016-12-08 | A kind of Karst area tunnel wall-hanging country rock face blast excavation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611121977.4A CN106545344B (en) | 2016-12-08 | 2016-12-08 | A kind of Karst area tunnel wall-hanging country rock face blast excavation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106545344A CN106545344A (en) | 2017-03-29 |
| CN106545344B true CN106545344B (en) | 2018-09-11 |
Family
ID=58396958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611121977.4A Expired - Fee Related CN106545344B (en) | 2016-12-08 | 2016-12-08 | A kind of Karst area tunnel wall-hanging country rock face blast excavation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106545344B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107133459B (en) * | 2017-04-25 | 2019-06-07 | 华东交通大学 | A kind of calculation method of tunnel cumulative photoface exploision periphery hole parameter |
| CN108278939B (en) * | 2018-01-25 | 2019-11-05 | 安徽理工大学 | A kind of blasting method for reducing rock convergence measure and reducing blasting vibration |
| CN113250704A (en) * | 2021-05-24 | 2021-08-13 | 中铁工程装备集团有限公司 | Hard rock tunnel construction method |
| CN115355777B (en) * | 2022-07-11 | 2023-08-22 | 中铁十九局集团有限公司 | Tunnel construction method for inducing rock burst to reduce duration time of rock burst under high ground stress |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100710410B1 (en) * | 2005-07-14 | 2007-04-24 | 오이환 | Tunnel high speed excavation method |
| CN102878876B (en) * | 2012-10-08 | 2014-08-27 | 江西稀有稀土金属钨业集团有限公司 | Mine roadway advancing and undermining method and main blasting parameters |
| CN103175451B (en) * | 2013-03-13 | 2015-08-05 | 中国建筑土木建设有限公司 | Construction method for controlling blasting through tunnel damping hole |
| CN104482815B (en) * | 2014-11-28 | 2016-08-24 | 中铁二十三局集团有限公司 | Tunnel smooth blasting method |
| CN105333778B (en) * | 2015-12-03 | 2017-08-08 | 中车建设工程有限公司 | Medium-deep hole large-section composite cut blasting structure and method |
| CN205262309U (en) * | 2015-12-03 | 2016-05-25 | 中车建设工程有限公司 | Compound undercutting blasting structure of big section of medium -length hole |
-
2016
- 2016-12-08 CN CN201611121977.4A patent/CN106545344B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN106545344A (en) | 2017-03-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107764144B (en) | A kind of tunnel Millisecond Controlled Blasting method | |
| CN106545344B (en) | A kind of Karst area tunnel wall-hanging country rock face blast excavation method | |
| CN106091848B (en) | It is a kind of to realize overlength, the method for high inclination-angle tunnel anchorage top bar explosion | |
| CN102607341B (en) | A kind of Stability of Open-pit Mine Slope controlled blasting method | |
| CN108132006B (en) | Anti-clogging quick well formation undercut blast hole arragement construction and its blasting method | |
| CN104482816B (en) | A kind of vertical periphery segment algorithm gradient presplit blasting method and device | |
| CN108007285A (en) | A kind of stone head deep hole sublevel is segmented efficient Cut Blasting method | |
| CN106121653B (en) | One kind closing hole surface mine ore stoping method | |
| CN102230768A (en) | High-efficiency inclined shaft tunneling blasting method for red clay | |
| CN108332626A (en) | Method for calculating reasonable delay of electronic detonator single-hole interval differential vibration-damping blasting | |
| CN103575172A (en) | Novel roadway blasting construction method | |
| CN109839043A (en) | A kind of presplit blasting shock-dampening method | |
| CN106767205A (en) | The micro- Comprehensive Control blasting method of shaking of bustling urban district subway running tunnel | |
| CN106225613A (en) | A kind of efficient segmentation method of ignition in tunnel excavating process | |
| CN104457466B (en) | A kind of blasting method of tunnel open excavation section | |
| CN102620612A (en) | Underground mine medium-length hole blasting method | |
| CN110879028A (en) | Surface mine blasting technical method for preventing frozen layer from being massive | |
| CN109974545A (en) | A kind of medium-length hole blasting outstanding top processing method in sublevel caving method | |
| RU2511330C2 (en) | Method for large-scale explosive destruction of mine rock masses of complex structure for selective extraction of mineral deposit at open-pit mining | |
| CN107339921A (en) | A kind of subway foundation pit blasting method | |
| CN110030889B (en) | Method for forming well by deep hole partition triangular net cut through one-time blasting | |
| CN209623525U (en) | The steel for shot structure of roadway development blasting | |
| CN110243245A (en) | The method of deep hole blasting | |
| CN103410513B (en) | Uneasily mining orebody mechanization process for stoping | |
| CN105823388A (en) | Blasting network structure used for slight dynamite |
Legal Events
| 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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180911 |