CN216642102U - Mining structure of low-grade thick and large ore body under broken ore rock condition - Google Patents
Mining structure of low-grade thick and large ore body under broken ore rock condition Download PDFInfo
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- CN216642102U CN216642102U CN202220214849.9U CN202220214849U CN216642102U CN 216642102 U CN216642102 U CN 216642102U CN 202220214849 U CN202220214849 U CN 202220214849U CN 216642102 U CN216642102 U CN 216642102U
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Abstract
The utility model discloses a mining structure of low-grade thick and large ore bodies under the condition of ore rock crushing, wherein a panel area is divided into a plurality of middle-section stopes, each middle-section stope is divided into a plurality of unit stopes, the top ends of the unit stopes are provided with a bar column and top rock drilling tunnels respectively arranged at two sides of the bar column, and the bottom ends of the unit stopes positioned at the bottommost layer are provided with bottom rock drilling tunnels; the top end of the rock drilling roadway at the bottom is provided with an upward fan-shaped blast hole, and a first horizontal shallow hole is arranged on a triangular ore pillar formed after the upward fan-shaped blast hole is blasted along the horizontal direction; the bottom end of the top rock drilling roadway is provided with a downward parallel medium-length hole along the vertical direction, the lower part of any one of the bars is provided with a second horizontal shallow hole along the horizontal direction, and two sides of the upper part of the bar are provided with upward inclined blast holes along the inclined direction. By the mode, the mining safety under the condition of broken ore rocks can be ensured, the triangular ore pillars and the strip pillars are recovered during mining, and the ore recovery rate of low-grade thick and large ore bodies is improved.
Description
Technical Field
The utility model relates to the technical field of mining, in particular to a mining structure of a low-grade thick and large ore body under the condition of crushing ore rocks.
Background
In the mining engineering, the requirement of crushing ores into lumps meeting the loading and transporting requirements is met, large-scale ore removal is facilitated, the rock body fracture surface after blasting does not have obvious blasting damage, and the tunnel damage is avoided or the requirement of rock blasting forming is met. For the exploitation of low-grade thick and large ore bodies, when the condition of ore rocks is broken, a small-structure-size segmented medium-length hole subsequent filling method is generally adopted for carrying out back exploitation, and the method has the advantages of small mining accuracy engineering quantity, large production capacity, small lean loss index and the like. However, the mining method is limited by the condition of broken rock, and the conditions of roof collapse, side slope collapse and the like may exist in part of stopes, so that the safety production is greatly influenced.
Therefore, it is necessary to design a mining structure of low-grade thick and large ore body under the condition of broken rock ore with high ore recovery rate, lower cost and high mining safety index.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems, the utility model provides a mining structure of low-grade thick and large ore bodies under the condition of broken ore rocks, a panel area is divided into a plurality of middle-section stopes, each middle-section stope is divided into a plurality of unit stopes, the unit stope at the lowest layer is jointly mined with an upward fan-shaped blast hole through a downward parallel middle-deep hole, a horizontal shallow hole is supplemented, and a strip column between a bottom triangular ore column and a top rock drilling roadway is recovered, the top middle-section stope at the upper part takes a top rock drilling roadway roof of an adjacent bottom middle-section stope as a flat bottom structure, and the upward fan-shaped blast hole is not required to be constructed, so that the construction amount is reduced, the cost is saved, the safety of mining under the condition of broken ore rocks is ensured, the triangular ore column and the strip column are recovered during mining, and the ore recovery rate of the low-grade thick and large ore bodies is improved.
In order to achieve the purpose, the utility model adopts the technical scheme that:
a mining structure of low-grade thick and large ore bodies under the condition of ore rock crushing comprises a plurality of middle-section stopes and a middle-section haulage roadway, wherein the middle-section stopes are sequentially arranged along the vertical direction;
the middle-section stopes respectively comprise a plurality of unit stopes which are sequentially arranged along the horizontal direction, the top ends of the unit stopes are respectively provided with a bar column and top rock drilling tunnels which are respectively arranged at two sides of the bar column, and the bottom ends of the unit stopes positioned at the bottommost layer are respectively provided with a bottom rock drilling tunnel;
an upward fan-shaped blast hole is formed in the top end of the bottom rock drilling roadway, and a first horizontal shallow hole is formed in a triangular ore pillar formed after the upward fan-shaped blast hole is blasted in the horizontal direction;
the bottom end of the top rock drilling roadway is provided with a downward parallel medium-length hole along the vertical direction, the lower part of the strip column is provided with a second horizontal shallow hole along the horizontal direction, and the left side and the right side of the upper part of the strip column are provided with upward inclined blast holes along the inclined direction.
Further, the bar is arranged at the middle position of the top end of the unit stope, and the width of the bar is one third of the width of the unit stope; two sets of top rock drilling tunnels symmetry set up in the left and right sides of strip, arbitrary a set of the width in top rock drilling tunnel is one third of the width in unit stope.
Further, a top plate is arranged at the top end of an inner cavity of the top rock drilling roadway, a combined support is arranged at the bottom end of the top plate and comprises a spray anchor net and anchor cables, the anchor cables comprise a plurality of first anchor cables perpendicular to the top plate and second anchor cables which are obliquely arranged with the top plate and extend to the top ends of the strip columns, and an included angle between each second anchor cable and the top plate is 5-10 degrees.
Furthermore, the first anchor cables are arranged side by side, the number of the first anchor cables is 2-4 rows, and the distance between every two adjacent first anchor cables is 1-1.7 m.
Further, any roof is arranged to be a flat bottom structure of the unit stope adjacent to the roof above the roof.
Further, the middle section haulage roadway sets up to two sets ofly to set up respectively in arbitrary one deck both ends around the bottom in middle section stope, the middle section haulage roadway perpendicular to the top rock drilling tunnel sets up.
Furthermore, a plurality of vein-penetrating ore removal tunnels are arranged between any two adjacent unit stopes, the included angle between each vein-penetrating ore removal tunnel and the top rock drilling tunnel is 40-50 degrees, and the distance between every two adjacent vein-penetrating ore removal tunnels is 10-12 m.
Further, the downward parallel medium-length holes in the same row are arranged in parallel, the hole distance is 3.6-4.0 m, the aperture is 120-150 mm, the row distance of the downward parallel medium-length holes in two adjacent rows is 3.6-4.0 m, and the blasting sequence of the downward parallel medium-length holes is that the blast holes in the same row are blasted from the middle blast hole to the blast holes on two sides in sequence.
Furthermore, the upward fan-shaped blast holes in the same row are arranged mutually to form a fan-shaped structure, the hole bottom distance is 2.0-2.4 m, the hole diameter is 76-80 mm, the row distance between every two adjacent rows of upward fan-shaped blast holes is 1.8-2.2 m, and the blast sequence of the upward fan-shaped blast holes is that the blast holes in the same row are blasted from the middle blast hole to the blast holes on the two sides in sequence.
Further, the first horizontal shallow holes in the same row are arranged in parallel, the hole distance is 1.3-1.6 m, the hole diameter is 40-50 mm, and the row distance between two adjacent rows of the first horizontal shallow holes is 1.3-1.6 m;
the second horizontal shallow holes in the same row are arranged in parallel, the hole distance is 1.3-1.6 m, the hole diameter is 40-50 mm, and the row distance between two adjacent rows of the second horizontal shallow holes is 1.3-1.6 m.
Compared with the prior art, the utility model has the beneficial effects that:
1. according to the mining structure of the low-grade thick and large ore body under the condition of ore rock crushing, the panel area is divided into a plurality of middle-section stopes, each middle-section stope is divided into a plurality of unit stopes, the unit stope at the lowest layer is jointly mined through the downward parallel middle-deep holes and the upward fan-shaped blast holes, and the horizontal shallow holes are supplemented to recover the strip columns between the bottom triangular ore pillars and the top rock drilling roadway, so that the mining safety under the condition of ore rock crushing can be ensured, the triangular ore pillars and the strip columns are recovered during mining, the ore recovery rate of the low-grade thick and large ore body is improved, the ore recovery rate is up to 95% in actual production, and the economic benefit and the social benefit are remarkable.
2. According to the mining structure of the low-grade thick and large ore body under the condition of the broken ore rock, the combined support is formed by adopting the shotcrete net and the anchor cable for the top plate of the top rock drilling roadway, so that the problems that the broken ore rock top plate is easy to collapse and small ore rocks fall are solved, and the safety production operation of a stope is ensured. In addition, the anchor cable and the top plate are arranged to be vertical and inclined to each other, advance support of the top plate is achieved, the top plate structure of the top rock drilling roadway is protected from being damaged during normal blasting, the anchor cable and the top plate can be completely reserved and can be used as a flat bottom structure of a middle stope above the top plate, the upper stope does not need to be constructed upwards to form a fan-shaped blast hole, construction amount is reduced, and cost is saved.
3. According to the mining structure of the low-grade thick and large ore body under the condition of ore rock crushing, the unit stope positioned at the bottommost layer adopts the mode of combined mining of the upward fan-shaped blast holes and the downward parallel medium-length holes, so that the problems that the overhung roof is easy to occur due to the overlarge interval of the blast holes at the upper part of the stope and the large lump rate of the ore is large when only the upward fan-shaped blast holes are adopted in the traditional mining process are solved; and the problems of difficult formation of a flat bottom structure, difficult construction and support and the like exist only by adopting the downward parallel medium-length hole. In addition, the upward fan-shaped blast holes of the lowest middle section stope can advance by 8-10 m from the upper parallel medium-length holes, and meanwhile, the bottom triangular ore pillars are recovered by supplementing the parallel holes; the mining structure is simple and easy to implement, the generation of large ores is reduced, and the recovery rate of low-grade ores is improved. In addition, the aperture of the downward parallel medium-length hole constructed in the top rock drilling roadway is increased relative to the aperture of the upward fan-shaped blast hole, the increase of the aperture of the downward parallel medium-length hole is beneficial to increasing the row distance and the bottom distance of the blast hole, the distance between the charging position and the space of the cutting groove is increased, and the safety risk is reduced. Meanwhile, the adoption of the downward parallel medium-length hole is also beneficial to controlling the stope boundary, and the damage to the stope boundary during blasting is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a mining structure of low-grade thick and large ore body under a condition of crushing ore rocks according to the utility model;
FIG. 2 is a schematic sectional view taken along line I-I in FIG. 1;
the parts in the drawings are numbered as follows: 10. a unit stope; 11. upward sector-shaped blast holes; 12. triangular ore pillars; 13. a first horizontal shallow hole; 14. downward parallel medium-length holes; 20. a middle section haulage roadway; 30. drilling a roadway at the bottom; 40. drilling a roadway at the top; 41. a top plate; 42. a second anchor cable; 43. a first anchor cable; 50. a bar; 51. a second horizontal shallow hole; 52. inclining the blast hole upwards; 60. drawing a vein through the ore removal roadway; 70. ore pass communication roadways; 71. and (7) sliding in a mine.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and processing steps closely related to the scheme of the present invention are shown in the drawings, and other details not closely related to the present invention are omitted.
In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Examples
As shown in fig. 1, a mining structure 100 of low-grade thick and large ore body under the condition of ore rock crushing comprises a plurality of middle-section stopes which are sequentially arranged along the vertical direction, and each middle-section stope comprises a plurality of unit stopes 10 which are sequentially arranged along the horizontal direction. During mining, the middle-section stopes are mined from bottom to top in sequence, and the unit stopes 10 of the same-layer middle-section stope are mined in steps. Specifically, taking a panel stope with a width of 90m to be mined as an example, the panel stope is divided into 3 layers of middle stopes with heights of 27m along the vertical direction, and each layer of middle stope is divided into 6 unit stopes 10 with widths of 15 m.
The top ends of the plurality of unit stopes 10 are provided with a bar column 50 and top rock drilling tunnels 40 respectively arranged on two sides of the bar column 50. The bar 50 is provided at a middle position of the top end of the unit stope 10, and has a width of one third of the width of the unit stope 10. Two groups of top rock drilling tunnels 40 are symmetrically arranged on the left side and the right side of the strip column 50, and the width of any group of top rock drilling tunnels 40 is one third of the width of the unit stope 10. In addition, the bottom ends of the unit stopes 10 located at the bottommost layer are all provided with bottom rock drilling galleries 30. The arrangement of the top rock drilling roadway 40 and the bottom rock drilling roadway 30 can facilitate blasting operation by opening blast holes from the rock drilling roadway.
Specifically, the top end of the bottom rock drilling roadway 30 is provided with an upward sector-shaped blast hole 11, and a first horizontal shallow hole 13 is horizontally arranged on a triangular ore pillar 12 formed after the upward sector-shaped blast hole 11 is blasted. The bottom end of the top rock drilling roadway 40 is provided with a downward parallel medium-length hole 14 along the vertical direction, and the strip column 50 is provided with a second horizontal shallow hole 51 along the horizontal direction. Wherein, the construction and blasting of the upward fan-shaped blast hole 11 always advance the distance of the downward parallel medium-length hole 14 by 10 m.
So set up, through dividing the panel into a plurality of middle section stopes, and divide into a plurality of unit stopes 10 with every middle section stope, the unit stope 10 of the lower floor jointly mines through parallel medium-length hole 14 and upward fan-shaped big gun hole 11 down, and replenish horizontal shallow hole and retrieve the strip column 50 between bottom triangle ore pillar 12 and the top rock drilling tunnel 40, not only can guarantee the security of mining under the broken ore rock condition, retrieve triangle ore pillar 12 and strip column 50 when mining, the ore recovery rate of low-grade thick ore body has still been improved, in actual production, the ore recovery rate is up to 95%, and economic benefits and social are showing.
As shown in fig. 1, in some embodiments, an upward sectored blast hole 11 is constructed from the top of the bottom rock drilling roadway 30 upward in one-step mining of the bottommost unit stope 10. The upward fan-shaped blast holes 11 are arranged in a plurality of rows and a plurality of columns, the upward fan-shaped blast holes 11 in the same row are mutually arranged to form a fan-shaped structure, the hole bottom distance is 2.0-2.4 m, and the hole diameter is 76-80 mm. In addition, the row spacing of the upward fan-shaped blast holes 11 in two adjacent rows is 1.8-2.2 m. Particularly, the blasting sequence of the upward fan-shaped blast holes 11 is that the blast holes in the same row are blasted from the middle blast hole to the blast holes on the two sides in sequence, so that the omnibearing ore caving is realized. After the upward sector-shaped blast holes 11 are charged, blasted and removed, triangular ore pillars 12 are formed at the bottoms of the unit stopes 10 where the upward sector-shaped blast holes 11 are located. The presence of the delta pillar 12 will cause the overall mining rate to drop, and subsequently a first horizontal shallow hole 13 is provided in the horizontal direction on the delta pillar 12 to blast the delta pillar 12. The first horizontal shallow holes 13 are arranged in multiple rows and multiple columns, the first horizontal shallow holes 13 in the same row are arranged in parallel, the hole distance is 1.3-1.6 m, the hole diameter is 40-50 mm, and the row distance of the first horizontal shallow holes 13 in two adjacent rows is 1.3-1.6 m.
As shown in fig. 1, in some embodiments, the bottom ends of both sets of top rock tunnels 40 are constructed down parallel medium-length holes 14. The downward parallel medium-length holes 14 are arranged in a plurality of rows and a plurality of columns, the same row of downward parallel medium-length holes 14 are arranged in parallel, the hole spacing is 3.6-4.0 m, and the hole diameter is 120-150 mm. And the row spacing of two adjacent rows of downward parallel medium-length holes 14 is 3.6-4.0 m. The aperture of the downward parallel medium-length hole 14 is increased relative to the aperture of the upward fan-shaped blast hole 11, the increase of the aperture of the downward parallel medium-length hole 14 is beneficial to increasing the row spacing and the hole bottom spacing of the blast holes, the distance between the charging position and the cutting groove space is increased, and the safety risk is reduced. Meanwhile, the adoption of the downward parallel medium-length hole 14 is also beneficial to controlling the stope boundary, and the damage to the stope boundary during blasting is reduced.
Particularly, the blasting sequence of the downward parallel medium-length holes 14 is that the blast holes in the same row are blasted from the middle blast hole to the blast holes on the two sides in sequence, so that the omnibearing ore caving is realized.
The presence of the barre 50 between the two sets of top rock drifts 40 also affects the overall mining rate and therefore also requires a second horizontal shallow hole 51 to be provided in the barre 50 in the horizontal direction to blast the barre 50. A second horizontal shallow hole 51 is provided in the lower structure of the bar 50. Meanwhile, the upper structure of the bar 50 is provided at the left and right sides thereof with upward inclined blastholes 52 in an inclined direction to ensure the blasting recovery effect of the bar 50. The second horizontal shallow holes 51 have the same structure and size as the first horizontal shallow holes 13, and are not described in detail.
In some embodiments, the two top rock drilling tunnels 40 are supplemented to the side edges near the middle of the unit stope 10 with medium-length holes inclined to the middle of the unit stope 10, so as to prevent the occurrence of large blocks or the situation that ore cannot be blasted.
As shown in fig. 1, in some embodiments the top end of the cavity of the top rock tunnel 40 is provided with a top plate 41 and the bottom end of the top plate 41 is provided with a joint support. Particularly, the top plate 41 can be used as a flat bottom structure of a middle stope above the top plate, and upward sector blast holes 11 do not need to be constructed in an upper stope, so that the construction amount is reduced, and the cost is saved.
The combined support includes a shotcrete net and anchor lines including a plurality of first anchor lines 43 arranged perpendicular to the top plate 41, and second anchor lines 42 arranged obliquely to the top plate 41 and extending to the top ends of the columns 50. The combined arrangement of the first anchor line 43 and the second anchor line 42 enables advance support to protect the top plate 41 of the top drilling tunnel 40 from damage during blasting. The process of the combined supporting of the shotcrete net and the anchor cable comprises the steps of firstly anchoring a top plate 41 of the top rock drilling roadway 40 by using the anchor rod and the anchor cable, then hanging a metal net, and finally carrying out shotcrete supporting.
Wherein, a plurality of first anchor ropes 43 set up each other side by side, and its quantity is 2 ~ 4 rows, and the interval of two adjacent first anchor ropes 43 is 1 ~ 1.7 m. The included angle between the second anchor cable 42 and the top plate 41 is 5-10 degrees.
As shown in fig. 1 to 2, in some embodiments, the middle section haulage roadways 20 are provided in two groups and are respectively provided at front and rear ends of the bottom end of the middle section stope of any one layer, and the middle section haulage roadways 20 are provided perpendicular to the top rock drilling roadway 40. In addition, a plurality of vein-penetrating ore removal roadways 60 are arranged between any two adjacent unit stopes 10. The included angle between the vein-penetrating ore removal roadway 60 and the top rock drilling roadway 40 is 40-50 degrees, and the distance between every two adjacent vein-penetrating ore removal roadways 60 is 10-12 m, so that convenient ore removal without trench is realized. After the stope blasting is completed, ore removal is performed through the middle section haulage roadway 20 and the vein-through ore removal roadway 60. It is noted that the lowermost unit panel 10 may also be mined through the bottom rock galleries 30.
In particular, a ore pass communication roadway 70 and an ore pass 71 are also arranged in the stope.
The following describes a specific mining mode of the present application:
first, one-step mining is performed on the lowermost unit stope 10, upward sector-shaped blast holes 11 are constructed from the bottom rock drilling roadway 30 corresponding to the mined unit stope 10, and charging and blasting are performed on the upward sector-shaped blast holes 11. And constructing downward parallel medium-length holes 14 from a top rock drilling roadway 40 corresponding to the mined unit stope 10, constructing horizontal shallow holes on the triangular ore pillars 12 and the strip pillars 50, charging and blasting all blast holes, and removing ores from the unit stope 10 after blasting. Subsequently, after the unit stopes 10 are mined, filling is performed by using filling bodies with the strength of 3.5MPa, and the method is repeated to perform two-step mining until all the bottommost unit stopes 10 are mined and filled (in the mining process, alternate unit stopes 10 can be selected to perform one-step mining simultaneously). And then, carrying out one-step mining on the adjacent middle-section stope above the mined lowest middle-section stope, adopting a top plate 41 of a top rock drilling roadway 40 of the lowest middle-section stope as a flat bottom structure, avoiding the need of constructing upward fan-shaped blast holes 11, enabling the arrangement and construction modes of the rest blast holes to be consistent with those of the lowest stope, and mining all the middle-section stopes sequentially from bottom to top by adopting the same method until the mining of the whole panel stope is finished.
The above description is only for the purpose of illustrating the technical solutions of the present invention and is not intended to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; all the equivalent structures or equivalent processes performed by using the contents of the specification and the drawings of the utility model, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A mining structure of low-grade thick and large ore bodies under the condition of ore rock crushing is characterized by comprising a plurality of middle-section stopes and a middle-section haulage roadway (20), wherein the middle-section stopes are sequentially arranged along the vertical direction, and the middle-section haulage roadway is arranged at the bottom end of any middle-section stope;
the middle-section stopes respectively comprise a plurality of unit stopes (10) which are sequentially arranged along the horizontal direction, the top ends of the unit stopes (10) are respectively provided with a bar column (50) and top rock drilling tunnels (40) which are respectively arranged at two sides of the bar column (50), and the bottom ends of the unit stopes (10) positioned at the bottommost layer are respectively provided with a bottom rock drilling tunnel (30);
an upward fan-shaped blast hole (11) is formed in the top end of the bottom rock drilling roadway (30), and a first horizontal shallow hole (13) is formed in a triangular ore pillar (12) formed after the upward fan-shaped blast hole (11) is blasted in the horizontal direction;
the bottom end of the top rock drilling roadway (40) is provided with a downward parallel medium-length hole (14) along the vertical direction, the lower part of the bar column (50) is provided with a second horizontal shallow hole (51) along the horizontal direction, and the left side and the right side of the upper part of the bar column are provided with upward inclined blast holes (52) along the inclined direction.
2. A mining structure of low-grade thick and large ore body under crushed ore condition according to claim 1, characterized in that the barred barrel (50) is provided at a middle position of the top end of the unit stope (10) and has a width of one third of the width of the unit stope (10); two sets of top rock drilling tunnel (40) symmetry set up in the left and right sides of strip (50), arbitrary a set of the width of top rock drilling tunnel (40) is one third of the width of unit stope (10).
3. The mining structure of low-grade thick and large ore bodies under the condition of ore rock crushing according to claim 2, characterized in that a top plate (41) is arranged at the top end of an inner cavity of the top rock drilling roadway (40), a combined support is arranged at the bottom end of the top plate (41), the combined support comprises a jet anchor net and anchor ropes, the anchor ropes comprise a plurality of first anchor ropes (43) which are arranged perpendicular to the top plate (41) and second anchor ropes (42) which are obliquely arranged with the top plate (41) and extend to the top end of the bar column (50), and the included angle between the second anchor ropes (42) and the top plate (41) is 5-10 degrees.
4. The mining structure of low-grade thick and large ore bodies under the condition of ore rock crushing according to claim 3, wherein the first anchor cables (43) are arranged side by side, the number of the first anchor cables is 2-4 rows, and the distance between every two adjacent first anchor cables (43) is 1-1.7 m.
5. The mining structure of low-grade thick and large ore bodies under crushed ore conditions according to claim 3, characterized in that any of the roof panels (41) is provided as a flat bottom structure of the unit stope (10) adjacent thereabove.
6. The mining structure of low-grade thick and large ore bodies under the condition of ore crushing according to claim 1, characterized in that the middle section haulage roadways (20) are arranged in two groups and are respectively arranged at the front end and the rear end of the bottom end of the middle section stope of any layer, and the middle section haulage roadways (20) are arranged perpendicular to the top rock drilling roadway (40).
7. The mining structure of low-grade thick and large ore bodies under the condition of ore rock crushing according to claim 6, characterized in that a plurality of vein-penetrating ore removal tunnels (60) are arranged between any two adjacent unit stopes (10), the included angle between each vein-penetrating ore removal tunnel (60) and the rock drilling tunnel (40) at the top is 40-50 degrees, and the distance between every two adjacent vein-penetrating ore removal tunnels (60) is 10-12 m.
8. The mining structure of low-grade thick and large ore bodies under the condition of ore rock crushing according to claim 1, characterized in that the downward parallel medium-length holes (14) in the same row are arranged in parallel with each other, the hole spacing is 3.6-4.0 m, the aperture is 120-150 mm, the row spacing of the downward parallel medium-length holes (14) in two adjacent rows is 3.6-4.0 m, and the blasting sequence of the downward parallel medium-length holes (14) is that the blast holes in the same row are blasted from the middle blast hole to the blast holes on two sides.
9. The mining structure of low-grade thick and large ore bodies under the condition of ore rock crushing according to claim 1, characterized in that the upward fan-shaped blast holes (11) in the same row are arranged in a fan-shaped structure, the hole bottom distance is 2.0-2.4 m, the hole diameter is 76-80 mm, the row distance between two adjacent rows of the upward fan-shaped blast holes (11) is 1.8-2.2 m, and the blasting sequence of the upward fan-shaped blast holes (11) is that the blast holes in the same row are blasted from the middle blast hole to the blast holes on two sides in sequence.
10. The mining structure of low-grade thick and large ore bodies under the condition of ore rock crushing according to claim 1, wherein the first horizontal shallow holes (13) in the same row are arranged in parallel, the hole spacing is 1.3-1.6 m, the hole diameter is 40-50 mm, and the row spacing of the first horizontal shallow holes (13) in two adjacent rows is 1.3-1.6 m;
the second horizontal shallow holes (51) in the same row are arranged in parallel, the hole distance is 1.3-1.6 m, the hole diameter is 40-50 mm, and the row distance between two adjacent rows of the second horizontal shallow holes (51) is 1.3-1.6 m.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115680663A (en) * | 2023-01-03 | 2023-02-03 | 矿冶科技集团有限公司 | Mining method for steeply-inclined broken ore body |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115680663A (en) * | 2023-01-03 | 2023-02-03 | 矿冶科技集团有限公司 | Mining method for steeply-inclined broken ore body |
| CN115680663B (en) * | 2023-01-03 | 2023-02-28 | 矿冶科技集团有限公司 | Mining method for steeply-inclined broken ore body |
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