CN106767210A - Surface drilling overhead caving method - Google Patents
Surface drilling overhead caving method Download PDFInfo
- Publication number
- CN106767210A CN106767210A CN201710143252.3A CN201710143252A CN106767210A CN 106767210 A CN106767210 A CN 106767210A CN 201710143252 A CN201710143252 A CN 201710143252A CN 106767210 A CN106767210 A CN 106767210A
- Authority
- CN
- China
- Prior art keywords
- caving
- top plate
- vertical hole
- thickness
- goaf
- 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.)
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Classifications
-
- 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
-
- 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
- F42D1/22—Methods for holding or positioning for blasting cartridges or tamping cartridges
Abstract
The invention discloses surface drilling overhead caving method, earth's surface is bored vertical hole, is clogged after powder charge in the vertical hole, then explosion；Wherein, to the thickness between rock stratum roof plate, i.e. goaf top plate presplitting safe thickness, it is calculated as follows Q=f (n) * q for the vertical hole bottomb*W3.Advantages of the present invention：(1) present invention bores upright opening not reaming overhead caving blasting technique from earth's surface, easy to operate, is not limited by a space, and without reaming program, greatly shortens the drilling operating time, improves caving efficiency, reduces caving cost；(2) using the reserved safe thickness computational methods of new goaf top plate, the caving that disposably succeeds can be realized, caving efficiency high, caving cost is substantially reduced, while it also avoid because of the unsuccessful problem for leaving potential safety hazard of a caving；(3) operating personnel is avoided in underground goaf operation, reduces the operating risk of operating personnel.
Description
Technical field：
The present invention relates to a kind of overhead caving method, more particularly to a kind of surface drilling overhead caving method.
Background technology：
Existing overhead caving construction method has three kinds：First method be tight roof hang top it is larger under the conditions of the edge that uses
Overhead caving construction method from break line edge to top plate drilling；Second method is bored parallel to the deep of working face in gallery
The overhead caving construction method in hole；The third method is surface drilling chambering overhead caving method.Wherein, the first and the
Two kinds of overhead caving construction methods, operating personnel is constructed in underground goaf, and the job safety of operating personnel cannot be ensured；Construction
Efficiency is low；Blast hole parameter is difficult to reach design requirement.The third surface drilling chambering overhead caving method, although can with gram
The deficiency of first two caving method is taken, but in construction, it is necessary to repeatedly putting a small amount of explosive in blasthole bottom hole carries out reaming so that big gun
Bottom hole portion forms medicine kettle, is then put into pack in medicine kettle, concentrates ignition to carry out caving, and it is comparatively laborious to there is reaming program, institute
Take time more long, caving efficiency is low；There is uncertain factor during reaming, be likely to result in useless hole, increase cost；Exist during reaming
Unsafe factor is such as：During chambering in the presence of go out thing to the personnel of surrounding and equipment cause damage risk.
Technical problem underlying if do not carried out reaming presence is：The determination of goaf top plate presplitting safe thickness, direct shadow
The effect of surface drilling explosion overhead caving is rung, such as goaf top plate presplitting safe thickness is excessive, goaf top plate is failed to lay down and,
But rock stratum can produce crack, the integrality of goaf top plate is destroyed, be that caving again brings great difficulty, there is safety hidden
Suffer from, meanwhile, a caving is unsuccessful, it is necessary to caving again；As goaf top plate presplitting safe thickness is too small, can be produced during explosion
Punching, i.e. blasting energy are discharged downwards along blasthole direction, and goaf top plate is punctured to form hole, but goaf top plate is put not
Get off, still need caving again.The many separate explosion cavings of same goaf top plate needs could succeed, and every time after caving, rock
The situation of layer can all become more complicated, and caving difficulty increases, and even cannot implement caving sometimes, leave potential safety hazard, caving
Efficiency is low, caving high cost.
How goaf top plate presplitting safe thickness is accurately calculated, as implementation surface drilling explosion overhead caving method urgently
Problem to be solved.The existing method for calculating the reserved safe thickness of goaf top plate has：1. thickness is across than method；2. barnyard length-width ratio
Method；3. structural mechanics beam theory calculating method；4. Pu Shi encircles theoretical calculation method etc., wherein, goaf top plate reserves safe thickness
It, in tunnel top down drillhole blasting, is the reserved depth of stratum of the safety for ensureing top operating personnel and equipment to refer to.With
Upper computational methods can not meet overhead caving and determine that goaf top plate is pre- for the purpose of meeting the safety in production of underground mine goaf
The requirement of safe thickness is split, therefore, in the urgent need to a kind of new computational methods.
The content of the invention：
It is an object of the invention to provide a kind of safe efficient, inexpensive surface drilling overhead caving method.
The present invention is implemented by following technical scheme：Surface drilling overhead caving method, earth's surface bores vertical hole, is hung down described
Clogged after powder charge in straight blasthole, then explosion；Wherein, the vertical hole bottom is to the thickness between rock stratum roof plate, i.e.,
Goaf top plate presplitting safe thickness, it is calculated as follows Q=f (n) * qb*W3, in formula, Q represents point charge dose；f
N () represents blasting action index；qbExpression standard pinpoint blasting explosive specific charge；W represents goaf top plate presplitting safe thickness.
Advantages of the present invention：(1) present invention bores upright opening not reaming overhead caving blasting technique from earth's surface, easy to operate,
It is not limited by a space, without reaming program, greatly shortens the drilling operating time, improve caving efficiency, reduces caving cost；(2)
Using the reserved safe thickness computational methods of new goaf top plate, the caving that disposably succeeds, caving efficiency high, caving can be realized
Cost is substantially reduced, while it also avoid because of the unsuccessful problem for leaving potential safety hazard of a caving；(3) operating personnel is avoided
In underground goaf operation, the operating risk of operating personnel is reduced.
Specific embodiment：
Surface drilling overhead caving method, earth's surface bores vertical hole, is clogged after powder charge in the vertical hole, so
Explosion afterwards；Wherein, the vertical hole bottom is to the thickness between rock stratum roof plate, i.e. goaf top plate presplitting safe thickness, its
It is calculated as follows Q=f (n) * qb*W3, in formula, Q represents point charge dose, according to engineering practice, through conventionally calculation
Obtain；F (n) represents blasting action index, is constant, according to engineering practice value；qbExpression standard pinpoint blasting explosive
Unit consumption, is constant, according to engineering practice value；W represents goaf top plate presplitting safe thickness.
Ejin Horo Banner sky is up to coal Co., Ltd colliery in 2003-2008 years using house column type blasting excavation 3-2
Coal seam, forms about 2.1km2Goaf, wherein 1.3km2Fire extinguishing engineering lift-off processing, residue about 0.8km are used2It is mined out
Area is untreated.
The bore diameter of this blasting engineering is chosen to be 150mm, and using high density emulsified detonator loading, density is in 1.25g/
cm3Between.
Goaf top plate presplitting safe thickness W is calculated according to following formula：
1. Q=f (n) * qb*W3
In formula, Q represents point charge dose, units/kg；Single-shot hole 1m powder charges dose is taken for point charge dose, Q=fries
1 meter of deep blasting hole volume=1.25*7.5*7.5*3.14*100=22kg of medicine density *, point charge dose is 22kg in this engineering；
F (n) represents blasting action index, and standard standing is 0.75, and this engineering takes 0.2；
qbExpression standard pinpoint blasting explosive specific charge, this engineering takes 0.5kg/m3；
W- burdens, are also goaf top plate presplitting safe thickness, are calculated：6.04m；
Hole depth L：L=56.5m；Wherein loess section buried depth 15m, is not required to explosion.
Pitch-row a：Pitch-row determines that a=(35-45) d, d is bore diameter, and this engineering hole takes 6m away from a according to following formula.
Stemming length l0For：l0=45 × 0.15=6.75m, in order to not make explosive charge energy loss, stemming length increases
To 8.5m.
Total hole count=detonating fuse total length/pitch-row=60m/6m=10.
Cushion thickness：In order to reduce direct impact of the explosive charge to back, before dress is wanted, 1.5m is initially charged with thick
Cushion.
Loaded length：L=L-l0- 1.5-15=56.5-8.5-1.5-15=31.5m.
Single hole explosive payload：Q=Q*l=22*31.5=693kg.
Total charge=total hole count × single hole explosive payload=10 × 693 ㎏=6.93t.
This engineering implements explosion by the technological parameter of above-mentioned setting, disposable to complete goaf caving, and caving efficiency high is put
Top cost is substantially reduced, while it also avoid because of the unsuccessful problem for leaving potential safety hazard of a caving.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Within god and principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (1)
1. surface drilling overhead caving method, it is characterised in that earth's surface bores vertical hole, and powder charge is laggard in the vertical hole
Row filling, then explosion；Wherein, the vertical hole bottom to the thickness between rock stratum roof plate, i.e. goaf top plate presplitting is pacified
Through thickness, it is calculated as follows Q=f (n) * qb*W3, in formula, Q represents point charge dose；F (n) represents that blast action refers to
Number；qbExpression standard pinpoint blasting explosive specific charge；W represents goaf top plate presplitting safe thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710143252.3A CN106767210A (en) | 2017-03-11 | 2017-03-11 | Surface drilling overhead caving method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710143252.3A CN106767210A (en) | 2017-03-11 | 2017-03-11 | Surface drilling overhead caving method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106767210A true CN106767210A (en) | 2017-05-31 |
Family
ID=58962086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710143252.3A Pending CN106767210A (en) | 2017-03-11 | 2017-03-11 | Surface drilling overhead caving method |
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| CN (1) | CN106767210A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112945037A (en) * | 2021-04-15 | 2021-06-11 | 攀钢集团矿业有限公司 | Construction method for underground mine suspension blasting treatment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102269554A (en) * | 2011-07-29 | 2011-12-07 | 西北矿冶研究院 | Method for treating underground mine goaf by forming covering layer by chamber blasting technology |
| CN103148747A (en) * | 2013-02-08 | 2013-06-12 | 中国神华能源股份有限公司 | Blasting method of shallow coal seam top plate |
| CN104074543A (en) * | 2014-06-16 | 2014-10-01 | 太原钢铁(集团)有限公司 | Method for processing large-scale underground goaf |
| CN106288995A (en) * | 2016-08-22 | 2017-01-04 | 安徽理工大学 | A kind of hole-by-hole initiation explosion treatment Abandoned golfs method |
-
2017
- 2017-03-11 CN CN201710143252.3A patent/CN106767210A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102269554A (en) * | 2011-07-29 | 2011-12-07 | 西北矿冶研究院 | Method for treating underground mine goaf by forming covering layer by chamber blasting technology |
| CN103148747A (en) * | 2013-02-08 | 2013-06-12 | 中国神华能源股份有限公司 | Blasting method of shallow coal seam top plate |
| CN104074543A (en) * | 2014-06-16 | 2014-10-01 | 太原钢铁(集团)有限公司 | Method for processing large-scale underground goaf |
| CN106288995A (en) * | 2016-08-22 | 2017-01-04 | 安徽理工大学 | A kind of hole-by-hole initiation explosion treatment Abandoned golfs method |
Non-Patent Citations (1)
| Title |
|---|
| 孟国良等: ""基于爆破漏斗试验装药量的计算公式"", 《煤矿爆破》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112945037A (en) * | 2021-04-15 | 2021-06-11 | 攀钢集团矿业有限公司 | Construction method for underground mine suspension blasting treatment |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170531 |
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| RJ01 | Rejection of invention patent application after publication |