CN106703809A - Method for forming cover layer through induced falling of open-pit-to-underground multi-branched orebody - Google Patents

Method for forming cover layer through induced falling of open-pit-to-underground multi-branched orebody Download PDF

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Publication number
CN106703809A
CN106703809A CN201710028699.6A CN201710028699A CN106703809A CN 106703809 A CN106703809 A CN 106703809A CN 201710028699 A CN201710028699 A CN 201710028699A CN 106703809 A CN106703809 A CN 106703809A
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China
Prior art keywords
ore
branched
rock
cover layer
orebody
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CN201710028699.6A
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CN106703809B (en
Inventor
李海英
黄笃学
任凤玉
张永坤
刘云华
王金龙
王洪秋
温海民
王文学
潘才
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Wuhan University of Science and Engineering WUSE
Wuhan University of Science and Technology WHUST
Hebei Iron and Steel Group Mining Co Ltd
HBIS Co Ltd
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Wuhan University of Science and Engineering WUSE
HBIS Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C41/00Methods of underground or surface mining; Layouts therefor
    • E21C41/16Methods of underground mining; Layouts therefor
    • E21C41/22Methods of underground mining; Layouts therefor for ores, e.g. mining placers
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C41/00Methods of underground or surface mining; Layouts therefor
    • E21C41/26Methods of surface mining; Layouts therefor
    • E21C41/30Methods of surface mining; Layouts therefor for ores, e.g. mining placers

Abstract

The invention discloses a method for forming a cover layer through induced falling of an open-pit-to-underground multi-branched orebody, and is characterized in that a sublevel caving method is applied for mining in an open-pit-to-underground multi-branched orebody, branched orebody re-mining approach roads are arranged along strike, sublevel cooperative re-mining is performed from top to bottom, a part of caved ore is initially left to be used as a safe cushion layer, along with re-mining sublevel down moving, a stripped continuous goaf bare to the earth surface is formed in an orebody deepening direction, a sandwich wall rock is promoted to gradually lose stability for flaking or collapsing along with increase of the surface area of goafs at both sides, and flaked waste rock is accumulated on the caved ore and replaces the ore safe cushion layer to form the cover layer. The cover layer is naturally formed by the falling property of the wall rock in the ore re-mining process; compared with a conventional method of forming the cover layer from caved side slope rock or backfilling waste rock, the method can save the time and cost to form the cover layer, has relatively large waste rock lumpiness of the formed cover layer, and can effectively reduce the caved ore loss rate and dilution rate.

Description

A kind of method that open air trestle multi-branched ore body induction caving forms coating
Technical field
The present invention relates to metalliferous deposit underground mining technical field, specifically a kind of open air trestle multi-branched ore body induction The method that inbreak forms coating.
Background technology
It is general at present useless using avalanche side slope country rock or backfill in the metal mine of multi-branched ore body open air trestle exploitation The conventional method of stone forms coating, and these methods form the expensive of coating, and formed coating rock fragmentation Smaller, during the releasing of underground broken ore, coating barren rock flows faster mixed volume is big, causes mine loss and dilution big. Therefore, multi-branched ore body open air trestle exploitation transitional period, because coating be artificially formed it is time-consuming expensive with and initially Lumpiness is small the problems such as deteriorate ore drawing effect, frequently results in the linking of mine production capacity difficult with mining benefit reduction.Therefore, invention is a kind of The method that open air trestle multi-branched ore body induction caving forms coating, enables coating self-assembling formation, and ensure covering The lumpiness of layer barren rock is significant.
The content of the invention
It is an object of the invention to provide a kind of method that open air trestle multi-branched ore body induction caving forms coating, To solve the key issue in above-mentioned background technology.
To achieve the above object, the present invention provides following technical scheme:
A kind of method that open air trestle multi-branched ore body induction caving forms coating, each branch ore body across pitch arrangement Extracting drift, the continuous dead zone of a plurality of banding is formed in vertical range direction, promotes interlayer country rock with both sides goaf surface area Increase gradually unstability slabbing or slump, the barren rock of slabbing is piled up on stope broken ore, forms coating.
As further scheme of the invention:The horizontal range l of ore body lower wall is left by following formula in the extracting drift position It is determined that:
In formula:α is the slanting angle of ore body, (°);β is disk side angle of spot hole, (°), β=55 °~60 ° in back production blasthole;H is segmentation Highly, m;B is the horizontal breadth of ore body, m.
As further scheme of the invention:Strike drift fan shaped medium length hole explosion back production, each step pitch with Upper point
Section collapses, and forms continuous goaf, promotes two wall country rock slabbings or slump, is piled up in an ore prose style free from parallelism for back production residual On, the coating needed for forming bottom body to be dug up mine.
As further scheme of the invention:The goaf depth h and length L need to meet following formula:
L≥10δ
In formula:α is the slanting angle of ore body, (°);δ is thickness of interlayer, m;RtFor the tension of the jointed rockmass after exploitation reduction is strong Degree, t/m2, exploitation weakening coefficient is 0.21~0.56;ρ is the density of jointed rockmass, t/m3
As further scheme of the invention:The each step pitch ore removal of Strike drift keeps to micro- dew goaf End mouth does not open sky, and the impact for preventing side wall country rock slabbing from causing endangers, while ore-rock interface level need to be kept to decline, control two Wall country rock continues slabbing or slump, is piled up on an ore prose style free from parallelism for back production residual, the covering needed for forming bottom body to be dug up mine Layer.
As further scheme of the invention:When the goaf constitutes a threat to safely to back production, in dead zone side, wall encloses Before sliver falls to forming coating, need to leave from Roof of access road and count ore safe bed course of the thickness not less than 3m, it is to avoid dead zone The impact harm that country rock slabbing or sliding are likely to result in.
Compared with prior art, the beneficial effects of the invention are as follows:The quantities that substantial amounts of workman forms coating is saved, Using emitting property of country rock, the self-assembling formation coating in ore exploitation process can not only save recovery time and expense, and shape Into coating barren rock lumpiness it is larger, advantageously reduce its lower loss late and the rate of dilution of the ore during ore drawing.Use the method Coating is formed, with safe efficient, environmentally friendly and low cost and other advantages.The present invention is especially suitable for high-dipping stratiform, like stratiform Ore body, 50 °~80 ° of inclination angle, thickness of interlayer are less than 20m, the small area of rainfall or the convenient open air trestle exploitation of subdrainage Metal mine.
Brief description of the drawings
Fig. 1 is the position view of extracting drift and branch's ore body.
Fig. 2 is the sectional view of A-A in Fig. 1.
Fig. 3 is the sectional view of C-C in Fig. 1.
In figure:The 1- stages transport Chuan Mai tunnels, 2- ramps, 3- segmentation tunnel, 4- segmentation connection lane, 5- downcasts, 6- return Ventilating shaft, 7- mine chutes, 8- extracting drifts, 9- cuttings tunnel, 10- cuttings well, 11- back production blastholes.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made Embodiment, belongs to the scope of protection of the invention.
Fig. 1~3 are referred to, in the embodiment of the present invention, a kind of open air trestle multi-branched ore body induction caving forms covering The method of layer, extracting drift 8 is arranged along orebody trend, and its position need to meet and fill sublevel caving and reclaim ore and along ore deposit Body move towards with the requirement that ribbon continuous dead zone is formed in deepening direction, route position leave the horizontal range l of ore body lower wall by FormulaIt is determined that.
Cutting tunnel 9 is beaten in the end of extracting drift 8, and cutting beats cutting well 10 in lane 9, is cut for the scope of freedom is formed with cutting well 10 Cut groove.
Back production blasthole 11 in extracting drift 8 is no more than ore limits, the ore of the same segmentation of multiple-limb ore body in principle Back production is cooperateed with using extracting drift 8 along the pulse, the continuous goaf of ribbon is being formed along vertical range direction, the both sides for leaving lose The interlayer country rock of support, with increase gradually unstability slabbing or the slump of both sides goaf surface area, the barren rock of slabbing is piled up in and collapses On the ore prose style free from parallelism that falls, the coating of adequate thickness is ultimately formed.
Mine chute 7 is transported to by being segmented connection lane 4 along the ore of the back production avalanche of extracting drift 8, is transferred to through mine chute 7 Stage transports Chuan Mai tunnels 1.
Each segmentation connection lane 4 is tunneled by being segmented tunnel 3;Couple through ramp 2 between each segmentation tunnel 3;It is fresh distinguished and admirable by entering Ventilating shaft 5 enters segmentation connection lane 4 to each working face, and dirty wind is discharged to earth's surface by upcast shaft 6.
The process for stoping process of each segmentation, the ore of extraction identical with sublevel caving method without sill pillar can be by underground haulage System is transported, and also can be transported to dew exploitation field by measure footrill, is transported by open air transport system by upside-down mounting.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be in other specific forms realized.Therefore, no matter From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power Profit requires to be limited rather than described above, it is intended that all in the implication and scope of the equivalency of claim by falling Change is included in the present invention.Any reference in claim should not be considered as the claim involved by limitation.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each implementation method is only wrapped Containing an independent technical scheme, this narrating mode of specification is only that for clarity, those skilled in the art should Specification an as entirety, the technical scheme in each embodiment can also be formed into those skilled in the art through appropriately combined May be appreciated other embodiment.

Claims (3)

1. a kind of method that open air trestle multi-branched ore body induction caving forms coating, it is characterised in that in multi-branched ore deposit In the exploitation of body open air trestle application sublevel caving method, the extracting drift across pitch of each branch ore body arrangement, from top to bottom by point Duan Xietong back production, in the continuous goaf of ribbon that vertical range direction forms exposed earth's surface, promotes interlayer country rock empty with both sides The increase of area's surface area gradually unstability slabbing or slump, the barren rock of slabbing is piled up on stope broken ore, and self-assembling formation covers Cap rock.
2. the method that a kind of open air trestle multi-branched ore body induction caving according to claim 1 forms coating, its It is characterised by, the horizontal range l that ore body lower wall is left in the extracting drift position is determined by following formula:
l = h cot α 1 - t a n α t a n β tan α + t a n β - B ;
α is the slanting angle of ore body, (°) in formula;β is disk side angle of spot hole, (°), β=55 °~60 ° in back production blasthole;H is height of lift, m;B is the horizontal breadth of ore body, m;Strike drift fan shaped medium length hole explosion back production, each step pitch collapses with upper segmentation Thoroughly, form continuous goaf, promote two wall country rock slabbings or slump, be piled up in the safe bed course of an ore prose style free from parallelism that is left during back production it On, form the required coating of bottom body to be dug up mine.
3. a kind of open air trestle multi-branched ore body induction caving according to claim 1,2 or 3 forms the side of coating Method, it is characterised in that the back production depth h and length L need to meet following formula:
h ≥ δR t 3 ρ cos α s i n α ;
L≥10δ;
α is the slanting angle of ore body, (°) in formula;δ is thickness of interlayer, m;RtIt is the tensile strength of the jointed rockmass after exploitation reduction, t/m2, Exploitation weakening coefficient is 0.21~0.56;ρ is the density of jointed rockmass, t/m3;The each step pitch ore removal of Strike drift is to micro- Untill airbreak area, end mouth is kept not open sky;When dead zone side wall country rock slabbing or slump activity are constituted safely to stope During threat, before coating is formed, leave from Roof of access road and count ore safe bed course of the thickness not less than 3m, to avoid sky The impact harm that area's country rock slabbing or sliding are likely to result in.
CN201710028699.6A 2017-01-16 2017-01-16 A kind of method that open air trestle multi-branched ore body induction caving forms coating Active CN106703809B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108049870A (en) * 2018-01-10 2018-05-18 鞍钢集团矿业有限公司 The induction caving mining methods of high-dipping middle thickness orebody of the upper disk containing unstable rock stratum
CN109973091A (en) * 2019-02-20 2019-07-05 北京昊华能源股份有限公司 A kind of coal-mining method in more branch type coal bodies
CN110017170A (en) * 2019-04-09 2019-07-16 中国华冶科工集团有限公司 The prevention and control method of underground ore extraction underground hazard

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Publication number Priority date Publication date Assignee Title
SU885556A1 (en) * 1980-02-14 1981-11-30 За витель ----0,4 Method of stripping the working levels of a mine pit
RU2165018C2 (en) * 1999-07-14 2001-04-10 Акционерная компания "АЛРОСА" ЗАО Method of combined mining of flooded mineral deposits
CN1693662A (en) * 2005-05-23 2005-11-09 东北大学 Improved sublevel caving method without bottom column
CN104806243A (en) * 2015-03-09 2015-07-29 东北大学 Wedge transferring transition method for transferring from open-pit mining to underground mining
CN104863591A (en) * 2015-06-16 2015-08-26 东北大学 Method for controlling caving and earth surface filling treatment in goaf
CN105041315A (en) * 2015-06-26 2015-11-11 东北大学 Method for controlling open-pit-to-underground hanging-wall ore mining rock movement

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Publication number Priority date Publication date Assignee Title
SU885556A1 (en) * 1980-02-14 1981-11-30 За витель ----0,4 Method of stripping the working levels of a mine pit
RU2165018C2 (en) * 1999-07-14 2001-04-10 Акционерная компания "АЛРОСА" ЗАО Method of combined mining of flooded mineral deposits
CN1693662A (en) * 2005-05-23 2005-11-09 东北大学 Improved sublevel caving method without bottom column
CN104806243A (en) * 2015-03-09 2015-07-29 东北大学 Wedge transferring transition method for transferring from open-pit mining to underground mining
CN104863591A (en) * 2015-06-16 2015-08-26 东北大学 Method for controlling caving and earth surface filling treatment in goaf
CN105041315A (en) * 2015-06-26 2015-11-11 东北大学 Method for controlling open-pit-to-underground hanging-wall ore mining rock movement

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108049870A (en) * 2018-01-10 2018-05-18 鞍钢集团矿业有限公司 The induction caving mining methods of high-dipping middle thickness orebody of the upper disk containing unstable rock stratum
CN108049870B (en) * 2018-01-10 2019-03-29 鞍钢集团矿业有限公司 The induction caving mining methods of high-dipping middle thickness orebody of the upper disk containing unstable rock stratum
CN109973091A (en) * 2019-02-20 2019-07-05 北京昊华能源股份有限公司 A kind of coal-mining method in more branch type coal bodies
CN109973091B (en) * 2019-02-20 2021-08-24 北京昊华能源股份有限公司 Coal mining method for multi-branch coal body
CN110017170A (en) * 2019-04-09 2019-07-16 中国华冶科工集团有限公司 The prevention and control method of underground ore extraction underground hazard

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