CN109322670B - Double-roadway upward fan-shaped blast hole blasting bottom-pulling mining system - Google Patents
Double-roadway upward fan-shaped blast hole blasting bottom-pulling mining system Download PDFInfo
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- CN109322670B CN109322670B CN201811345128.6A CN201811345128A CN109322670B CN 109322670 B CN109322670 B CN 109322670B CN 201811345128 A CN201811345128 A CN 201811345128A CN 109322670 B CN109322670 B CN 109322670B
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- 238000005422 blasting Methods 0.000 title claims abstract description 33
- 238000005065 mining Methods 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000011435 rock Substances 0.000 description 27
- 238000000034 method Methods 0.000 description 10
- 238000005553 drilling Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
-
- 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
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Remote Sensing (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a double-roadway upward fan-shaped blast hole blasting bottom-pulling mining system, which comprises: the first bottom pulling roadway and the second bottom pulling roadway; the first bottom pulling blast hole group is arranged above the first bottom pulling roadway and is communicated with the first bottom pulling roadway, and comprises a plurality of first outer side bottom pulling blast holes far away from the second bottom pulling roadway and a plurality of first inner side bottom pulling blast holes close to the second bottom pulling roadway; the second bottom pulling blast hole group is arranged above the second bottom pulling roadway and is communicated with the second bottom pulling roadway, and comprises a plurality of second outer side bottom pulling blast holes far away from the first bottom pulling roadway and a plurality of second inner side bottom pulling blast holes close to the first bottom pulling roadway; and (5) an ore removal roadway. The system can obviously improve the working efficiency, reduce the production cost and ensure the stability of the bottom structure of the bottom pulling space in the underground high-stress environment by adopting an efficient large-area blasting bottom pulling mode of 'upward fan-shaped blastholes of double roadways'.
Description
Technical Field
The invention relates to the field of industrial and mining, in particular to a double-roadway upward fan-shaped blast hole blasting bottom-pulling mining system.
Background
The natural caving method is a large-scale low-cost underground mining method, has large production capacity, is convenient for organization management, is safe to operate, has low mining cost, and is the only high-efficiency underground mining method which can be compared with the open-pit mining economic benefit.
However, existing natural caving mining means have yet to be improved.
Disclosure of Invention
The present invention has been made based on the findings of the inventors of the following problems and facts:
the natural caving method requires rather strict conditions for mining ore bodies, and requires high production management levels and technical strength support, so that the method is more risky than other mining processes. The shape of the bottom pulling space and the arrangement mode of the bottom pulling roadway have great influence on the difficulty level of bottom pulling operation and the induction of initial continuous ore caving.
By looking up the related data of foreign natural caving method mines, the inventor finds that a bottom pulling mode of 'single-roadway downward annular blast holes' is adopted in the conventional natural caving method production, the bottom pulling roadway is located right above the ore drawing roadway, the distance between the bottom pulling roadways is equal to the distance between the ore drawing roadways, as shown in fig. 1 (in fig. 1, 1 is the bottom pulling blast holes, 2 is the bottom pulling roadway, 3 is the ore drawing roadway, 4 is a mineral gathering groove, 5 is a peach-shaped ore pillar, and 6 is the downward bottom pulling blast holes). The mode is few in bottom pulling roadway and saves the engineering amount, but due to the fact that part of bottom pulling drilling holes (bottom pulling blast holes) which incline downwards exist, the phenomenon of plugging of the rear downwards drilling holes easily occurs during bottom pulling blasting, and particularly in broken rocks, cleaning is very difficult, and a large amount of manpower and material resources are consumed. The middle part between the other two bottom pulling tunnels is not well blasted, rock columns, floor slabs, rock walls and the like are easy to form, the bottom pulling propelling speed is seriously influenced, and the stress of a working surface cannot be released by bottom pulling blasting in time, so that the damage of a bottom structure is aggravated. And the processing of the rock column, the floor slab and the like is difficult, and the deep hole is required to be drilled upwards from the ore drawing roadway for blasting, so that the stability of the bottom structure is adversely affected, and the cost is high.
In view of the above, the invention provides a double-roadway upward fan-shaped blasting bottoming mining system. The system can obviously improve the working efficiency, reduce the production cost and ensure the stability of the bottom structure of the bottom pulling space in the underground high-stress environment by adopting an efficient large-area blasting bottom pulling mode of 'upward fan-shaped blastholes of double roadways'.
In one aspect, the invention provides a double roadway upward sector blasthole blasting bottoming mining system. According to an embodiment of the invention, the system comprises:
the first bottom pulling roadway and the second bottom pulling roadway;
the first bottom pulling blast hole group is arranged above the first bottom pulling roadway and is communicated with the first bottom pulling roadway, and comprises a plurality of first outer bottom pulling blast holes far away from the second bottom pulling roadway and a plurality of first inner bottom pulling blast holes close to the second bottom pulling roadway;
the second bottom pulling blast hole group is arranged above the second bottom pulling roadway and is communicated with the second bottom pulling roadway, and comprises a plurality of second outer side bottom pulling blast holes far away from the first bottom pulling roadway and a plurality of second inner side bottom pulling blast holes close to the first bottom pulling roadway;
the ore drawing tunnel is arranged between the first pull-down tunnel and the second pull-down tunnel and is positioned below the first pull-down tunnel and the second pull-down tunnel.
According to the double-roadway upward fan-shaped blasthole blasting bottom-pulling mining system, the double roadway and the fan-shaped first and second bottom-pulling blasthole groups are adopted, and the tops of the bottom-pulling blastholes are in a saw-tooth shape, so that ore rock caving is facilitated, and ore discharging roadway collection is facilitated. Through the upward bottom pulling mode that all bottom pulling blast holes are arranged above the bottom pulling roadway, the downward holes drilled in the prior art are avoided, the problems of a rock column, a floor slab, a rock wall and the like in the prior art are thoroughly solved, the pushing efficiency and the quality of a bottom pulling space are improved, the stress concentration in an underground high-stress environment is reduced, and the stability of a system bottom structure is ensured.
In addition, the double-roadway upward fan-shaped blasthole blasting and bottom pulling mining system according to the embodiment of the invention can also have the following additional technical characteristics:
in some embodiments of the invention, the first and second draw-bottom lanes are disposed at shoulders of a peach-shaped pillar to be mined.
In some embodiments of the invention, the horizontal distance between the first and second draw-bottom lanes is 10-20 m.
In some embodiments of the invention, the vertical distance between the ore drawing roadway and the first and second draw-bottom roadways is 10-20 m respectively and independently.
In some embodiments of the present invention, the horizontal distance between the ore drawing tunnel and the first draw-bottom tunnel is L1, the horizontal distance between the ore drawing tunnel and the second draw-bottom tunnel is L2, and l1=l2.
In some embodiments of the present invention, an included angle between the first outer bottom-pulling blast hole and the bottom surface of the first bottom-pulling roadway is 5-85 degrees.
In some embodiments of the present invention, an included angle between the first inner bottom-pulling blast hole and the bottom surface of the first bottom-pulling roadway is 45-90 degrees.
In some embodiments of the present invention, an included angle between the second outer bottom-pulling blast hole and the bottom surface of the second bottom-pulling roadway is 5-85 degrees.
In some embodiments of the present invention, an included angle between the second inner bottom-pulling blast hole and the bottom surface of the second bottom-pulling roadway is 45-90 degrees.
In some embodiments of the present invention, the depths of each of the first outer side bottoming hole, the first inner side bottoming hole, the second outer side bottoming hole, and the second inner side bottoming hole are each independently 5-15 m.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of a prior art construction of a single roadway downward annular blasthole blasting bottom pulling form;
FIG. 2 is a schematic structural view of a double roadway upward sector blasthole blasting bottoming mining system in accordance with one embodiment of the present invention;
fig. 3 is a schematic structural view of a double-roadway upward sector blasthole bottom-pulling mining system in accordance with yet another embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, terms such as "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly attached, detachably attached, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In one aspect, the invention provides a double roadway upward sector blasthole blasting bottoming mining system. Referring to fig. 2, according to an embodiment of the present invention, the system includes: the first draw-bottom roadway 100, the second draw-bottom roadway 200, the first draw-bottom blast hole group, the second draw-bottom blast hole group and the ore removal roadway 300. Wherein the first bottom pulling blasthole group is arranged above the first bottom pulling roadway 100 and is communicated with the first bottom pulling roadway 100, and comprises a plurality of first outer bottom pulling blastholes 110 far away from the second bottom pulling roadway 200 and a plurality of first inner bottom pulling blastholes 120 close to the second bottom pulling roadway 200; the second bottom pulling blasthole group is arranged above the second bottom pulling roadway 200 and is communicated with the second bottom pulling roadway 200, and comprises a plurality of second outer bottom pulling blastholes 210 far away from the first bottom pulling roadway 100 and a plurality of second inner bottom pulling blastholes 220 close to the first bottom pulling roadway 100; the ore drawing tunnel 300 is disposed between the first and second draw-bottom tunnels 100 and 200 and below the first and second draw-bottom tunnels 100 and 200.
According to the double-roadway upward fan-shaped blasthole blasting bottom-pulling mining system, the double roadway and the fan-shaped first and second bottom-pulling blasthole groups are adopted, and the tops of the bottom-pulling blastholes are in a saw-tooth shape, so that ore rock caving is facilitated, and ore discharging roadway collection is facilitated. Through the upward bottom pulling mode that all bottom pulling blast holes are arranged above the bottom pulling roadway, the downward holes drilled in the prior art are avoided, the problems of a rock column, a floor slab, a rock wall and the like in the prior art are thoroughly solved, the pushing efficiency and the quality of a bottom pulling space are improved, the stress concentration in an underground high-stress environment is reduced, and the stability of a system bottom structure is ensured.
According to an embodiment of the present invention, as shown in fig. 2, the first and second draw-bottom lanes 100 and 200 are provided at the shoulder of the peach-shaped pillar 400 to be mined and at one side of the mine gathering tank 500. Compared with the prior art that the bottom pulling roadway is arranged at the top end of the peach-shaped ore pillar, the system changes the number of the bottom pulling roadway into two, and the arrangement position is moved to the shoulder part of the peach-shaped ore pillar, so that the problems of rock pillar, floor slab, rock wall and the like in the prior art can be further solved, the propulsion efficiency and quality of the bottom pulling space are improved, the stress concentration in an underground high-stress environment is reduced, and the stability of the bottom structure of the system is ensured.
According to an embodiment of the present invention, as shown in fig. 2, the horizontal distance L between the first and second draw-bottom lanes may be 10-20 m. The horizontal distance between two laneways in the traditional single laneway bottom pulling form is generally about 30m, and the double laneway bottom pulling form of the double laneway bottom pulling method increases the number of bottom pulling working faces in the same area by shortening the horizontal distance between the two laneways, so that the rock drilling efficiency is improved, the bottom pulling speed is accelerated, the stress concentration of the bottom pulling face for a long time can be effectively avoided, and the stability of a bottom structure is maintained.
According to an embodiment of the present invention, the vertical distance between the ore drawing tunnel 300 and the first and second draw-bottom tunnels 100 and 200 is 10-20 m, respectively, independently. As shown in fig. 2, the vertical distance between the ore drawing roadway 300 and the first draw-bottom roadway 100 is H1, the vertical distance between the ore drawing roadway 300 and the first draw-bottom roadway 200 is H2, and the H1 and H2 can be 10-20 m respectively and independently, so that a peach-shaped ore column with enough size can be reserved, and the stability of the bottom structure is further facilitated.
According to the embodiment of the present invention, as shown in fig. 2, the horizontal distance between the ore drawing tunnel 300 and the first draw-bottom tunnel 100 is L1, the horizontal distance between the ore drawing tunnel 300 and the second draw-bottom tunnel 200 is L2, and l1=l2, so that the ore drawing tunnel is disposed in the middle position of the first and second draw-bottom tunnels, and a symmetrical peach-shaped ore column with a bottom structure can be formed, which is further beneficial to the stability of the bottom structure.
According to the embodiment of the invention, after the bottom is pulled by adopting the system of the invention, the roadway is in a saw-tooth shape after the bottom is pulled, which is beneficial to ore rock caving, and the inventor finds that after the bottom is pulled by adopting the system of the invention, the ore rock mass degree is larger in initial caving, and the inclination angle of the bottom pulling blast holes arranged at the two sides of the ore pillar is larger than the friction angle generated between the crushed rock and the original rock in order to ensure that the crushed ore has better fluidity to be beneficial to cleaning the bottom pulling bottom plate.
According to an embodiment of the present invention, the included angle between the first outer bottom-pulling blasthole 110 and the bottom surface of the first bottom-pulling roadway 100 may be 5 to 85 degrees. According to an embodiment of the present invention, the included angle between the first inner bottom-pulling blasthole 120 and the bottom surface of the first bottom-pulling roadway 100 may be 45 to 90 degrees. Therefore, the bottom pulling mode is not lower than the downward drilling of the bottom surface of the first bottom pulling roadway 100, and the upward fan-shaped bottom pulling blastholes formed by the first outer bottom pulling blastholes 110 and the first inner bottom pulling blastholes 120 are adopted, so that the problems that ore rocks form rock columns, "floors", rock walls and the like after the bottom pulling by blasting can be thoroughly solved, the working efficiency is remarkably improved, the production cost is reduced, and the stability of the bottom structure of the bottom pulling space in an underground high-stress environment is ensured.
According to an embodiment of the present invention, the included angle between the second outer bottom-pulling blasthole 210 and the bottom surface of the second bottom-pulling roadway 200 may be 5-85 degrees. According to an embodiment of the present invention, the included angle between the second inner bottom-pulling blasthole 220 and the bottom surface of the second bottom-pulling roadway 200 may be 45 to 90 degrees. Therefore, the bottom pulling mode is not provided with downward drilling holes lower than the bottom surface of the second bottom pulling roadway 100, and the upward fan-shaped bottom pulling blastholes formed by the second outer bottom pulling blastholes 210 and the second inner bottom pulling blastholes 220 can thoroughly solve the problems that ore rocks form rock columns, "floors", rock walls and the like after the bottom pulling by blasting, remarkably improve the working efficiency, reduce the production cost and ensure the stability of the bottom structure of the bottom pulling space in an underground high-stress environment.
According to an embodiment of the present invention, the depths of the respective first outer side bottoming blasthole 110, first inner side bottoming blasthole 120, second outer side bottoming blasthole 210 and second inner side bottoming blasthole 220 are each independently 5-15 m. Therefore, the blasting effect is improved, the rate of massive ores is reduced, and ores after blasting are discharged from the bottom structure conveniently.
According to an embodiment of the present invention, as shown in fig. 3, a plurality of double-roadway upward fan-shaped blasthole blasting bottoming mining systems may be arranged at intervals, with a cutting courtyard 600 spaced between the two systems.
In summary, according to the double-roadway upward fan-shaped blasthole blasting bottom-pulling mining system provided by the embodiment of the invention, by adopting the double roadway and fan-shaped first and second bottom-pulling blasthole group forms, the top after bottom pulling is in a zigzag shape, so that ore rock collapse and ore discharging roadway collection are facilitated. Through the upward bottom pulling mode that all bottom pulling blast holes are arranged above the bottom pulling roadway, the downward holes drilled in the prior art are avoided, the problems of a rock column, a floor slab, a rock wall and the like in the prior art are thoroughly solved, the pushing efficiency and the quality of a bottom pulling space are improved, the stress concentration in an underground high-stress environment is reduced, and the stability of a system bottom structure is ensured.
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not limiting in any way.
Examples
The deep bottom pulling level of a copper mine adopts a double-roadway upward fan-shaped blast hole blasting bottom pulling mode
In order to reduce the phenomena of rock pillars, floorslabs and the like in the bottom pulling process and ensure the bottom pulling quality and efficiency, the mine deep bottom pulling level adopts the upward fan-shaped blasting bottom pulling mining system of the double laneways, namely, the bottom pulling laneway is moved from the top end of the peach-shaped ore pillar to the shoulder, and one bottom pulling laneway is changed into two lanewaies. The horizontal spacing between the first and second draw-down lanes is 15m. Through practice, the upward hole bottom pulling mode of the double roadways avoids drilling downward holes, thoroughly solves the problem of 'floor', improves bottom pulling efficiency and quality, reduces stress concentration, ensures the stability of a bottom structure and has good field reaction effect.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (8)
1. An upward fan-shaped blasthole blasting bottom-pulling mining system for double roadways, comprising:
the first bottom pulling roadway and the second bottom pulling roadway;
the first bottom pulling blast hole group is arranged above the first bottom pulling roadway and is communicated with the first bottom pulling roadway, and comprises a plurality of first outer bottom pulling blast holes far away from the second bottom pulling roadway and a plurality of first inner bottom pulling blast holes close to the second bottom pulling roadway;
the second bottom pulling blast hole group is arranged above the second bottom pulling roadway and is communicated with the second bottom pulling roadway, and comprises a plurality of second outer side bottom pulling blast holes far away from the first bottom pulling roadway and a plurality of second inner side bottom pulling blast holes close to the first bottom pulling roadway;
the ore drawing roadway is arranged between the first pull-down roadway and the second pull-down roadway and is positioned below the first pull-down roadway and the second pull-down roadway;
the first draw-bottom roadway and the second draw-bottom roadway are arranged on the shoulder parts of the peach-shaped ore pillars to be mined;
the horizontal distance between the first pull-down roadway and the second pull-down roadway is 10-20 m.
2. The double-roadway upward sector blasthole blasting bottoming mining system of claim 1, wherein the vertical distance between the ore drawing roadway and the first bottoming roadway and the second bottoming roadway is 10-20 m respectively and independently.
3. The double-roadway upward-fan-shaped blasthole blasting bottoming mining system of claim 2, wherein a horizontal distance of the ore drawing roadway from the first bottoming roadway is L1, a horizontal distance of the ore drawing roadway from the second bottoming roadway is L2, and l1=l2.
4. The double-roadway upward sector blasthole blasting bottom-pulling mining system of claim 1, wherein an included angle between the first outer bottom-pulling blasthole and the first bottom-pulling roadway bottom surface is 5-85 degrees.
5. The double-roadway upward sector blasthole blasting bottom-pulling mining system of claim 1, wherein an included angle between the first inner bottom-pulling blasthole and the first bottom-pulling roadway bottom surface is 45-90 degrees.
6. The double-roadway upward sector blasthole blasting bottom-pulling mining system of claim 1, wherein an included angle between the second outer bottom-pulling blasthole and the second bottom-pulling roadway surface is 5-85 degrees.
7. The double-roadway upward sector blasthole blasting bottom-pulling mining system of claim 1, wherein an included angle of a bottom surface between the second inner bottom-pulling blasthole and the second bottom-pulling roadway is 45-90 degrees.
8. The double-roadway upward sector blasthole blasting bottom-pulling mining system of claim 1, wherein the depth of each of the first outer bottom-pulling blasthole, the first inner bottom-pulling blasthole, the second outer bottom-pulling blasthole and the second inner bottom-pulling blasthole is 5-15 m independently.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111963175B (en) * | 2020-07-28 | 2022-06-17 | 广西大学 | Thick ore body mining method |
| CN112033243A (en) * | 2020-09-16 | 2020-12-04 | 云南迪庆有色金属有限责任公司 | Upward sector wave-shaped bottom-pulling blasting method |
| CN113669064A (en) * | 2021-08-31 | 2021-11-19 | 中国恩菲工程技术有限公司 | Natural caving mining method |
| CN114412468B (en) * | 2022-02-07 | 2022-09-30 | 北京科技大学 | Caving-to-filling transition subsection and isolated ore pillar combined mining method |
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| CN103184870A (en) * | 2013-03-05 | 2013-07-03 | 安徽金日盛矿业有限责任公司 | Open backfilling mining method during borehole drilling period |
| CN108518223A (en) * | 2018-02-11 | 2018-09-11 | 中冶北方（大连）工程技术有限公司 | A kind of vertical long hole spheric cartridge falls mine method |
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