CN106150505B - Efficient fine blasting method for ultrathin ore body - Google Patents
Efficient fine blasting method for ultrathin ore body Download PDFInfo
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- CN106150505B CN106150505B CN201610782314.0A CN201610782314A CN106150505B CN 106150505 B CN106150505 B CN 106150505B CN 201610782314 A CN201610782314 A CN 201610782314A CN 106150505 B CN106150505 B CN 106150505B
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- blasthole
- hole
- ore body
- ore
- blasting
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/22—Methods of underground mining; Layouts therefor for ores, e.g. mining placers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
Abstract
The invention discloses a high-efficiency fine blasting method of an extremely thin ore body, which belongs to the field of mining and comprises the following steps: step 1, arranging a rock drilling project: when the inclination angle of the ore body is less than or equal to 30 degrees, tunneling, drilling and climbing are performed in the direction vertical to the ore body; when the inclination angle of the ore body is larger than 30 degrees, arranging a sectional rock drilling roadway along the direction of the ore body; step 2, arranging blast holes: a plurality of blast holes which form included angles of 40-60 degrees with the center line of the roadway are arranged on the two sides of the ore body, and the blast holes comprise: side blast holes and middle blast holes; step 3, charging: filling blasting explosive into each blast hole by adopting a gradient charging structure matched with the size of the blasting resistance line; and 4, detonating: and selecting all blast holes to perform detonation blasting according to a set sequence according to the stable state of the top and the bottom plates of the ore rock. The method can improve the production capacity, save the mining and cutting engineering quantity, reduce the dilution rate, realize the fine blasting control of the limited space, is a brand new high-efficiency fine blasting method for the extremely thin ore body, adopts the deep hole high-efficiency blasting, and only recovers the ore without damaging the surrounding rock.
Description
Technical field
The present invention relates to field of mining, more particularly to a kind of efficient fine blasting method of very thin ore body.
Background technology
Very thin orebody mining is the technical barrier on mining circle in world wide.Extra narrow vein is in China's non-ferrous metal and gold
In mine, distribution is wider, and occupies certain weight proportion.Currently, the mining methods of such ore body can divide two major classes, i.e., it is mixed adopt and
It point adopts, mixed adopt is by ore and country rock mixed mining, and it is to exploit ore and country rock respectively point to adopt.Mixed class of adopting is based on simplifying back
Excavating technology improves mining intensity；Point adopting class is conceived to reduction ore dilution rate.It is mixed adopt class mining codes with shallow hole shrinkage method, comprehensively
Based on method；Point adopting class mining codes mainly has resuing stoping.
No matter mix to adopt or divide and adopt, current very thin ore body blasting excavation is primarily present following technical barrier：(1) shallow bore hole rock drilling,
Adopt small, and blasting in groups, back production efficiency are low；(2) because ore body is very thin, shallow bore hole is adopted small in addition, needed for back production unit ore amount
Adopt that cut quantities big, adopt cut it is of high cost；(3) explosion is serious to roof and floor surrounding rock failure under short environment, and a large amount of barren rocks are mixed into
Ore, mining loss rate are excessively high；(4) a large amount of ores are detained restricted clearance, not only influence demolition effect, but also cause later stage ore removal tired
It is difficult；(5) explosion still belongs to extensive, does not carry out fining system research to steel for shot, charge constitution and burst time etc.；(6)
Though individual documents propose the conventional deep hole blasting using big hole depth, large aperture, big powder stick, the accurate control of explosion cannot achieve
System.
Invention content
Based on the above existing technology problems, the present invention provides a kind of efficient fine explosion side of very thin ore body
Method, can realize very thin ore body explosion precision control and scale operation, effectively solve at present very thin ore body explosion low precision,
The low problem of efficiency.
In order to solve the above technical problems, the present invention provides a kind of efficient fine blasting method of very thin ore body, including：
Step 1, drilling engineering is arranged：
When the slanting angle of ore body≤30 °, vertical orebody trend driving rock drilling is gone up a hill；Work as the slanting angle of ore body>At 30 °, walked along ore body
To arrangement sublevel drilling tunnel；
Step 2, blasthole is arranged：
(it is arranged on left and right sides when the slanting angle of ore body≤30 °, works as the slanting angle of ore body in the ore body bilateral>It is upper and lower two at 30 °
Side；Similarly hereinafter) arrange that several blastholes at 40 °~60 ° angles, the blasthole include with the center line in the tunnel：Side blasthole (explosion
Release orientation fracturing blasthole can be focused) and intermediate hole (explosion positioning leaves blasthole), the side blasthole and intermediate hole are
Small-bore, big hole depth blasthole；
Step 3, powder charge：
It is matched quick-fried using structure size is packed into each blasthole with the matched gradient charge constitution of explosion burden size
Broken medication；
Step 4, it detonates：
(it is top, bottom when the slanting angle of ore body≤30 ° according to the top of ore-rock, bottom plate using drilling drift overall length as compensation space
Plate works as the slanting angle of ore body>Be upper and lower disk at 30 °) steady status, select whole blastholes to detonate by setting sequence, to stope
Overall length carries out disposable global blowup.
Beneficial effects of the present invention are：Pass through arrangement drilling engineering, arrangement blasthole, powder charge and the detonation step carried out successively
Cooperation, is combined especially with specific blasthole and arrangement with powder charge, detonation mode so that the blasting method can be controlled accurately
The explosion for making very thin ore body improves production capacity, and saving, which is adopted, cuts quantities, reduces the rate of dilution, realizes restricted clearance fining
Blasting Control.The blasting method of the present invention is suitable for very thin class ore body or the other media exploitation at various inclination angles.Theory and practice
It proves：The blasting method realizes that very thin ore body is efficient, fine explosion：Global blowup, which is drawn, to be adopted, and realizes exploitation scale；Side blasthole
Blasting energy focuses release orientation fracturing, and the problems such as ore-rock interface is smooth, and solution dilution is excessive are effectively ensured；It is intermediate in restricted clearance
Shot hole blasting positioning leaves, and meets process for stoping requirement；With the gradient charge constitution for becoming burden Optimized Matching, rationally utilize quick-fried
Broken energy；Small-bore, macropore depth deep hole blasting realize fining Blasting Control and adopt width high-efficiency mining greatly.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is the steel for shot schematic diagram of blasting method provided in an embodiment of the present invention；
Fig. 2 is the steel for shot diagrammatic cross-section of blasting method provided in an embodiment of the present invention；
Fig. 3 is the side blast hole loading structure vertical section schematic diagram of blasting method provided in an embodiment of the present invention；
Fig. 4 is the side blast hole loading structure cross-sectional view of blasting method provided in an embodiment of the present invention；
Fig. 5 is the intermediate hole charge constitution vertical section schematic diagram of blasting method provided in an embodiment of the present invention.
Specific implementation mode
The following is a clear and complete description of the technical scheme in the embodiments of the invention, it is clear that described embodiment
Only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiment of the present invention, ordinary skill
The every other embodiment that personnel are obtained without making creative work, belongs to protection scope of the present invention.
The embodiment of the present invention provides a kind of efficient fine blasting method of very thin ore body, can accurately control the quick-fried of very thin ore body
It is broken, production efficiency is promoted, this approach includes the following steps：
Step 1, drilling engineering is arranged：
When the slanting angle of ore body≤30 °, vertical orebody trend driving rock drilling is gone up a hill；Work as the slanting angle of ore body>At 30 °, walked along ore body
To arrangement sublevel drilling tunnel；
Step 2, blasthole is arranged：
(it is arranged on left and right sides when the slanting angle of ore body≤30 °, works as the slanting angle of ore body in ore body bilateral arrangement>At 30 ° for it is upper,
Lower both sides) with the center line in the tunnel at several blastholes of 40 °~60 ° angles, the blasthole includes：(blasting energy is poly- for side blasthole
Coke release orientation fracturing blasthole) and intermediate hole (explosion positioning leaves blasthole), the side blasthole and intermediate hole are aperture
The blasthole of diameter, big hole depth；
Step 3, powder charge：
It is matched quick-fried using structure size is packed into each blasthole with the matched gradient charge constitution of explosion burden size
Broken medication；
Step 4, it detonates：
Using drilling drift overall length as compensation space, according to the top of ore-rock, bottom plate steady status (when the slanting angle of ore body≤30 °
Shi Weiding, bottom plate, work as the slanting angle of ore body>It is upper and lower disk at 30 °), select whole blastholes to detonate by setting sequence, to stope
Overall length carries out disposable global blowup.
In the step 2 of above-mentioned blasting method, pressed from both sides at 40 °~60 ° in ore body bilateral arrangement and the center line in the tunnel
Several blastholes at angle, the blasthole include：(explosion is fixed for side blasthole (blasting energy focuses release orientation fracturing blasthole) and intermediate hole
Position leaves blasthole), the side blasthole and intermediate hole be small-bore, big hole depth blasthole include：
In top, the ore body at bottom plate setting small-bore, big hole depth deep hole as side blasthole, in the mine
Body centre position be arranged small-bore, big hole depth deep hole as intermediate hole；
The side blasthole use diplopore form, the intermediate hole use single hole form, the side blasthole, intermediate hole according to
Secondary interlaced arrangement is alternatively arranged setting in the ore body；
The diplopore of the side blasthole is separately positioned on the top apart from the ore body, is energy at a certain distance from bottom plate boundary line
Explosion realizes that the blasting energy that fine cut is carried out to ore body orientation fracturing focuses release orientation fracturing blasthole；The intermediate big gun
Hole is arranged in the ore body middle, to the ore body cut for energy explosion realization and the explosion positioning effectively dished out leaves
Blasthole.
The aperture of side blasthole in above-mentioned blasting method step 2 arrangement blasthole is 32~35mm, the depth of side blasthole is 3~
6m；The aperture of intermediate hole is 32~35mm, and the depth of intermediate hole is 3~6m.Specifically, diplopore form setting on ore body
While blasthole pitch-row and while borehole distance intermediate hole between array pitch ratio be not less than 1.
In above-mentioned blasting method, the thickness of ore body is 0.4~1.0m；In the blasthole, the side big gun of diplopore form setting
The pitch of holes in hole is 0.3~0.8m；Between the side blasthole and the intermediate hole of single hole form setting of the diplopore form setting
Array pitch is 0.3~0.6m with explosion burden；The side blasthole of diplopore form setting is 0.05 with top, bottom plate at a distance from~
0.15m。
In above-mentioned blasting method, knot is packed into each blasthole using with the matched gradient charge constitution of explosion burden size
The matched explosion medication of structure size includes：
Side blasthole is to focus release orientation fracturing blasthole, and each side blasthole is packed into 3~4 bilateral groove powder sticks, each bilateral
A diameter of 25~26mm of groove powder stick, bilateral are equipped with groove, are filled in proportion along bottom hole to aperture direction according to blasthole angle
Medicine length is successively decreased successively；The bottom hole of each side blasthole is 0.1~0.15m, side big gun at a distance from the hole bottom bilateral groove powder stick
The distance between each bilateral groove powder stick at position is 0.2~0.4m among hole, the aperture of each side blasthole at the aperture
The distance of bilateral groove powder stick is 0.3~0.6m；
Intermediate hole is that positioning leaves blasthole, and each intermediate hole is packed into 2 round powder sticks, each circle powder stick it is a diameter of
25~26mm successively decreases along bottom hole to aperture direction loaded length successively in proportion according to blasthole angle；The bottom hole of each intermediate hole
It is 0.1~0.15m with the round powder stick of hole bottom distance, distance is 0.3~0.5m, each intermediate big gun between two round powder sticks
The aperture in hole and the round powder stick distance in the aperture are 0.4~0.7m.
In the step 4 of above-mentioned blasting method, according to the top of ore-rock, the steady status of bottom plate, select whole blastholes by setting
Sequence carries out detonation explosion：
When ore-rock is top, bottom plate shakiness fixing structure, adjacent 2 side blastholes at top plate of detonating simultaneously first, then simultaneously
2 adjacent side blastholes, fracturing and fine cut are oriented to ore body at detonation bottom plate, and the intermediate hole that finally detonates will have been cut
Ore body is cut to leave to precalculated position；
When ore-rock is top, bottom plate robust structure, side blasthole and intermediate hole can be divided into the hole packed plane of two kinds of forms, top
The lateral opening 1 lateral opening same row of composition corresponding with bottom plate of plate 1, single intermediate hole is another row.According to every artillery salvo hole and certainly
It is detonated by hole packed plane by the distance in face is ascending, but detonated simultaneously with blasthole in row successively.
Blasting method of the present invention is described further with reference to specific embodiment.
The blasting method of the present invention, can solve following technical problem underlying in current blasting method：
(1) shallow bore hole rock drilling adopts that small, blasting efficiency is low；
(2) adopt that cut quantities big；
(3) it pushes up, bottom plate explosion destruction is serious, the rate of dilution is excessively high；
(4) a large amount of broken ores are detained restricted clearance；
(5) explosion fining degree is poor.
The blasting method of the present invention is suitable for the very thin orebody mining of different angle.It is with the very thin ore body of low-angle dip class below
Example is explained, and other class ore body technical solutions are similar to its, referring to Fig. 1, are as follows：
Step 1, drilling engineering arrangement：
(rock drilling is combined into one by mine, ore removal engineering and compensation space four to vertical orebody trend driving drilling drift, engineering profit
With rate height, adopt cut it is at low cost), bilateral arrangement with laneway midline at 40 °~60 ° angles blasthole.Blasthole is to mend with drilling drift
Space is repaid, it can be achieved that along drilling drift overall length, primary, global blowup under maximum single blow blasting charge enabled condition, makes very thin ore body
Mining scale solves inefficiency problem caused by traditional shallow bore hole blasting in groups adopts a small, cycle mostly.
Step 2, steel for shot (are ore body referring in Fig. 1,2, Fig. 11,2 be top plate, and 3 be bottom plate, and 4 be compensation space, and 5 are
Side blasthole, 6 be intermediate hole)：
(1) cloth hole thinking：
The overall technical thought using " explosion ore body does not destroy country rock ".Since very thin ore body excavation is limited, give
Efficient explosion causes great difficulty.For Precise control ore-rock boundary, reduce roof and floor destroy, and realize it is long and narrow, short, by
Ore leaves to precalculated position under limit, clipping environment, and roof and floor side blasthole carries out fine cut by orienting fracturing to ore body, in
Between blasthole to cutting ore body effectively dished out.
(2) cloth well format (referring to Fig. 2)：
Double, single hole successively interlaced arrangement, be alternatively arranged, be conducive to being uniformly distributed for blasting energy.Wherein, diplopore is arranged in
In ore body, one group is respectively arranged at a certain distance from apart from ore body top, bottom plate boundary line, the Voice segment being distributed using bilateral is recessed respectively
Slot powder stick discharges orientation fracturing blasthole to focus；Single hole is arranged in ore body middle, leaves blasthole for positioning, ore is left
To drilling drift precalculated position.
(3) hole arrangement parameters：
Shallow bore hole aperture, hole depth are smaller, and deep hole aperture, hole depth are larger.For very thin ore body limited space, explosion clipping
Particular surroundings, blasthole using " small-bore, big hole depth " novel blasthole：1. " small-bore, small medicine coil " is convenient for narrow ore body
It is accurately positioned and refines explosion, small-bore blasthole 32~35mm of Φ, 25~26mm of small diameter medicine roll Φ.2. " big hole depth " can increase
Add and adopts width, improves blasting efficiency.According to ore body fluctuations degree, unilateral 3~6m of blast hole depth, bilateral adopt width up to 6~
12m。
Pitch-row and array pitch ratio should be not less than 1, and general value is as follows：A --- pitch of holes is：0.3~0.8m；b——
Array pitch is with explosion burden：0.3~0.6m；C --- orebody thickness is：0.4~1.0m；D --- side blasthole and roof and floor
Distance be：0.05~0.15m.
Step 3, charge constitution：
Using the gradient charge constitution being adapted with explosion burden size, be conducive to overcome the clipping of restricted clearance to make
With.
Since blasthole and wall are at 40 °~60 ° angles, using tunnel as compensating space in blasting, from aperture to bottom hole, difference
The linear ratio of its burden of hole depth position increases (scale is related to blasthole angle).Therefore, match using with hole depth
Gradient charge constitution with adapt to burden variation, meet fining broken rock requirement.
(1) side blasthole (focusing release orientation fracturing blasthole)：
Referring to Fig. 3,4,3~4 powder sticks are housed per hole, it is different according to blasthole angle, along bottom hole to aperture direction loaded length
It proportionally reduces, i.e. h>i>j>k.In addition, bottom hole and powder stick distance e are 0.1~0.15m, between powder stick distance f take 0.2~
0.4m, aperture are 0.3~0.6m with powder stick distance g.
Powder stick in the blasthole of side uses bilateral groove powder stick 7,7 both sides of bilateral groove powder stick to be equipped with groove, it can be achieved that quick-fried
Broken Voice segment and release reach line to excite induction ore-rock that tensile failure occurs along adjacent two blastholes groove center line A
Property fracturing rock breaking efficiency.
(2) intermediate hole (positioning leaves blasthole)
It is different according to blasthole angle per hole equipped with 2 round powder sticks referring to Fig. 5, it is pressed to aperture direction loaded length along bottom hole
Ratio is reduced, i.e. o>p.In addition, bottom hole and powder stick distance l are 0.1~0.15m, distance m takes 0.3~0.5m, aperture between powder stick
It is 0.4~0.7m with powder stick distance n.
4, firing order：
Referring to Fig. 2, firing order is specifically divided into following 2 kinds.
(1) when roof and floor built on the sand, ore and rock condition it is poor when：Roof and floor side blasthole is detonated first is oriented cause to ore body
It splits and fine cut, then intermediate hole will cut ore body and leave to precalculated position.4 sections of explosions of blasthole point, specifically detonate suitable
Sequence is 1#, 4#；2#、5#；3#；6#.Top plate or the explosion simultaneously of the adjacent diplopore of bottom plate fully realize that side shot hole blasting can focus release
With orientation fracturing.
(2) when roof and floor is firm, ore and rock condition is preferable：1 row, 2 rows, 3 rows, 4 artillery salvo holes are sequentially detonated successively.Blasthole point
4 sections of explosions, specific firing order are 1#, 2#；3#；4#、5#；6#, front-seat blasthole provides the scope of freedom for heel row blasthole and compensation is empty
Between.Top plate or the non-concurrent explosion of the adjacent diplopore of bottom plate, but blasting energy orientation Fracturing can be still played to a certain extent.
The blasting method of the present invention is, it can be achieved that very thin ore body global blowup is drawn and adopted：Bilateral arrangement and lane in drilling drift
The deep hole that road forms an angle, explosion ore body do not destroy country rock.Blasthole is (special without arrangement by compensation space of drilling drift
Door cutting engineering), under maximum single blow blasting charge enabled condition, overall length, primary, global blowup can be carried out along drilling drift, to
Realize that very thin ore body melts the transformation adopted from traditional shallow bore hole blasting in groups of inefficiency to deep hole overall size.
Side blasthole is set by short space so that blasting energy focuses release orientation fracturing：Very thin ore body excavation is low
Short, when using deep hole blasting, borehole distance ore body roof and floor is close, but relatively far away from from the scope of freedom, and explosion inevitably causes roof and floor
Country rock seriously destroys, a large amount of barren rocks are mixed into ore, to which the back production rate of dilution greatly increases.Therefore, enhancing blasting energy is along pre- prosecutor
Upward concentration release and effective broken rock simultaneously weaken the pass that the destruction that it is generated into country rock is roof and floor Blasting Control
Key.
It is respectively one group close to the top of ore body, bottom plate diplopore, groove powder stick is focused using special two-side energy, forms blasting energy
Amount stream stiffening device realizes that the induced fracture along ore body and roof and floor boundary, precise controlling ore-rock interface had both safeguarded top, bottom plate
It is smooth, stable, support cost is reduced, and it is excessive to substantially reduce dilution caused by due to explosion destroys country rock.
Intermediate hole sequence blasting positioning is arranged by restricted clearance to leave：
Very thin ore body excavation is limited, and when using deep hole blasting, borehole distance ore body roof and floor is close, from the scope of freedom but phase
To farther out, it is easy to appear " asphyxias by external pressure on the chest and abdomen " to cause demolition effect undesirable for blasthole, and ore is made largely to be stranded in restricted clearance.Cause
This, makes broken ore effectively leave to precalculated position, meet the emphasis that process for stoping requirement is interstitial hole Blasting Control.
Intermediate hole forms joint pack with roof and floor blasthole to a certain extent, the clamping action of country rock is overcome, by mine
Body is crushed and leaves to process for stoping requirement, avoids ore in the delay in short space.It is pressed from both sides by blasthole appropriate
Angle control leaves direction, uses gradient charge constitution to control to leave and speed and leaves distance.
Pass through the gradient charge constitution with change burden Optimized Matching under clipping environment：
Since blasthole and wall form an angle, using tunnel as compensating space in blasting, from aperture to bottom hole, different hole depths
The linear ratio of its burden of position increases.Therefore, the gradient charge constitution to match with hole depth is used to adapt to burden change
Change, be conducive to the clamping action for overcoming restricted clearance, meets the requirement for refining broken rock under clipping environment.
Using the deep hole of small-bore, big hole depth fine explosion is realized as blasthole：
Shallow bore hole is small-bore, small hole depth, and deep hole is large aperture, big hole depth.For very thin ore body limited space, explosion clipping
Particular surroundings the technical advantage of shallow bore hole and deep hole is fully merged using the novel deep hole of " small-bore, big hole depth "：Small-bore,
Small medicine coil " is accurately positioned and refines explosion convenient for narrow ore body, and " big hole depth ", which can increase, adopts width, improves blasting efficiency.
Production capacity can be improved in the blasting method of the present invention, and saving, which is adopted, cuts quantities, reduces the rate of dilution, realizes limited sky
Between refine Blasting Control, be a kind of completely new very thin ore body efficient fine blasting method, using the efficient explosion of deep hole, back production
Ore does not destroy country rock, solves exploit predicament caused by current shallow blasting, stripping barren rock mode well, realize very thin
The new breakthrough in ore body blasting excavation field.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art is in the technical scope of present disclosure, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Subject to enclosing.
Claims (5)
1. a kind of efficient fine blasting method of very thin ore body, which is characterized in that including：
Step 1, drilling engineering is arranged：
When the slanting angle of ore body is less than or equal to 30 °, the vertical orebody trend driving rock drilling is gone up a hill；When the slanting angle of ore body is more than 30 °,
Along orebody trend arrangement sublevel drilling tunnel；
Step 2, blasthole is arranged：
Arrange that several blastholes with the center line in the tunnel at 40 °~60 ° angles, the blasthole include in the ore body bilateral：
Side blasthole and intermediate hole, the side blasthole and intermediate hole be small-bore, big hole depth blasthole；
Step 3, powder charge：
It is used using the matched explosion of structure size is packed into each blasthole with the matched gradient charge constitution of explosion burden size
Medicine, including：Side blasthole is discharged using focusing orients fracturing blasthole, 3~4 bilateral groove powder sticks of each side blasthole loading, each pair
A diameter of 25~26mm of side groove powder stick, bilateral is equipped with groove, according to blasthole angle in proportion along bottom hole to aperture direction
Loaded length successively decreases successively；The bottom hole of each side blasthole is 0.1~0.15m, side at a distance from the hole bottom bilateral groove powder stick
The distance between each bilateral groove powder stick at position is 0.2~0.4m among blasthole, the aperture of each side blasthole at the aperture
Bilateral groove powder stick distance be 0.3~0.6m；
Intermediate hole leaves blasthole using positioning, and each intermediate hole is packed into 2 round powder sticks, each circle powder stick it is a diameter of
25~26mm successively decreases along bottom hole to aperture direction loaded length successively in proportion according to blasthole angle；The bottom hole of each intermediate hole
It is 0.1~0.15m with the round powder stick of hole bottom distance, distance is 0.3~0.5m, each intermediate big gun between two round powder sticks
The aperture in hole and the round powder stick distance in the aperture are 0.4~0.7m；
Step 4, it detonates：
Using drilling drift overall length as compensation space, according to the top of ore-rock, the steady status of bottom plate, select whole blastholes suitable by setting
Sequence is detonated, and disposable global blowup is carried out to stope overall length；In the step 4, according to the top of ore-rock, the steady status of bottom plate, choosing
Select whole blastholes by setting sequence carry out detonation explosion include：
When ore-rock is top, bottom plate shakiness fixing structure, adjacent side blasthole at the top plate that detonates simultaneously first, then detonate bottom plate simultaneously
Locate adjacent side blasthole, fracturing and fine cut are oriented to ore body, the intermediate hole that finally detonates leaves ore body has been cut
To precalculated position；
When ore-rock be top, bottom plate robust structure, according to every artillery salvo hole at a distance from the scope of freedom it is ascending by hole packed plane successively
Detonation, wherein side blasthole and intermediate hole are divided into the hole packed plane of two kinds of forms, one at top plate it is lateral opening at bottom plate pairs
The lateral opening same row of composition answered, single intermediate hole is another row.
2. a kind of efficient fine blasting method of very thin ore body according to claim 1, which is characterized in that the step 2
In, arrange that several blastholes with the center line in the tunnel at 40 °~60 ° angles, the blasthole include in the ore body bilateral：Side
Blasthole and intermediate hole, the side blasthole and intermediate hole be small-bore, big hole depth blasthole include：
When the slanting angle of ore body is less than or equal to 30 °, in the left and right sides of the ore body arrangement and the center line in the tunnel at 40 °~
Several blastholes of 60 ° of angles, when the slanting angle of ore body is more than 30 °, the center line of the both sides up and down arrangement and the tunnel of the ore body
At several blastholes of 40 °~60 ° angles；
In top, the ore body at bottom plate setting small-bore, big hole depth deep hole as side blasthole, in the ore body
Meta position install small-bore, big hole depth deep hole as intermediate hole；
The side blasthole uses diplopore form, the intermediate hole to use single hole form, and the side blasthole, intermediate hole are handed over successively
Mistake arrangement is alternatively arranged setting in the ore body；
The diplopore of the side blasthole is separately positioned on the top apart from the ore body, at a certain distance from bottom plate boundary line, and being can explosion
Realize that the blasting energy that fine cut is carried out to ore body orientation fracturing focuses release orientation fracturing blasthole；The intermediate hole cloth
It sets in the ore body middle, the ore body cut for energy explosion realization and the explosion positioning effectively dished out leaves big gun
Hole.
3. a kind of efficient fine blasting method of very thin ore body according to claim 1 or 2, which is characterized in that the step
In the blasthole of rapid 2 arrangement, the aperture of side blasthole is 32~35mm, and the depth of side blasthole is 3~6m；The aperture of intermediate hole is 32
The depth of~35mm, intermediate hole are 3~6m.
4. a kind of efficient fine blasting method of very thin ore body according to claim 3, which is characterized in that on the ore body
Diplopore form setting while blasthole pitch-row and while borehole distance intermediate hole between array pitch ratio be not less than 1.
5. a kind of efficient fine blasting method of very thin ore body according to claim 3, which is characterized in that the ore body
Thickness is 0.4~1.0m；
In the blasthole, the pitch of holes of the side blasthole of diplopore form setting is 0.3~0.8m；
Array pitch between the side blasthole and the intermediate hole of single hole form setting of diplopore form setting is with explosion burden
0.3~0.6m；
The side blasthole of the diplopore form setting is 0.05~0.15m at a distance from top, bottom plate.
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