A combined method of medium-length hole and large-diameter long hole blasting mining

Abstract

The application discloses a combined mining method of medium-length hole and large-diameter deep hole, and the implementation steps include setting a 55-72m stoping stage and dividing the stoping stage into upper and lower sections, setting an upper drilling roadway in the upper section and drilling large-diameter deep holes downward, interval charging and setting a 5m non-charging section at the hole mouth, setting one blasting cycle for three rows, and blasting hole by hole with a delay of 25ms; setting a lower drilling roadway in the lower section and drilling fan-shaped medium-length holes upward and continuously charging, setting one blasting cycle for three rows, setting a 5m non-charging section at the hole mouth of the last row of blast holes, fully charging the blast holes of the first row of blast holes in the second cycle, normally charging the middle row of blast holes, and blasting the blast holes in the same row with a delay of 20ms and the blast holes in the adjacent row with a delay of 65ms; the upper section is pre-blasted and the lower section is delayed-blasted during the blasting operation, and ore is discharged after single blasting. By jointly using the upward medium-length hole and the downward large-diameter deep hole, the stoping height is doubled compared with the single use of the medium-length hole, the preparation and mining engineering quantity is greatly reduced, the mining cost is low, the stoping efficiency is high, and the economic and safety benefits of enterprises are good.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mining, and particularly relates to a combined mining method of medium-length hole and large-diameter deep hole. BACKGROUND

[0002] In the process of underground mining, when thick or super-thick ore bodies are encountered, a medium-length hole blasting mining method is usually used for mining. When this method is used, in order to better control the hole deflection rate and blasting safety, an upward drilling method is usually used, and the sublevel mining height can only be set to 15-20 m, which results in the need to construct a sublevel development engineering (such as an upper and lower panel ventilation roadway, a transportation roadway, an intake and return air shaft, an inclined ramp, etc.), a support engineering and a mining preparation engineering every 15-20 m, which is large in construction quantity and is not conducive to cost control. In addition, the single medium-length hole blasting mining method has low single caving ore quantity and low recovery efficiency, which cannot meet the production needs of large mines.

[0003] In the prior art, some mines use a φ150 large-diameter deep hole mining method to try to solve the above problems, which can increase the sublevel mining height to a certain extent, but is limited by the drilling capacity of the existing drilling equipment. When the drilling depth exceeds 25 m, the deflection rate gradually increases. Even if a centralizer or other tool is used to assist drilling, the hole depth is difficult to exceed 55 m. In addition, the existing large-diameter deep hole mining method usually uses a large charge amount of explosive layer (such as filling 4 emulsion explosive strips) arranged at intervals, and a charge structure with a hole diameter of 2.2-2.5 m. The large blasting vibration easily causes the destruction of the stope boundary and the adjacent filling body, the sticking of ore, the dilution of ore, the instability of the stope edge and other phenomena. In addition, a large amount of ore is easily turned over during the blasting process, and personnel and equipment need to enter the stope for secondary processing, which is difficult to ensure the safety of the operation, seriously affects normal production, and restricts the safe and economic benefits of enterprises. SUMMARY

[0004] The present application aims to provide a combined mining method of medium-length hole and large-diameter deep hole to solve the problems of small sublevel mining height, large construction quantity, high investment cost, low recovery efficiency and low operation safety factor in the prior art.

[0005] The present application is implemented by the following technical scheme:

[0006] The present application provides a combined mining method of medium-length hole and large-diameter deep hole, which comprises the following implementation steps:

[0007] S1, determining a recovery stage: a plurality of recovery stages are arranged along the depth direction of the ore body to be mined, the mining height of each recovery stage is set to 55-72 m according to the lithology, each recovery stage is divided into an upper sublevel and a lower sublevel, and a mining roadway is arranged at the lower part of each recovery stage.

[0008] S2, arranging the mining engineering and drilling blast holes: dividing a plurality of ore rooms along the strike of the vein in the stoping stage, arranging an upper drilling roadway in the upper part of each ore room, and forming a plurality of rows of large-diameter deep holes in the upper sublevel by downward construction, the hole depth of the large-diameter deep holes being set to 30-55m; arranging a lower drilling roadway in the lower part of each ore room, and forming a plurality of rows of medium-deep holes in the lower sublevel by upward construction, the hole depth of the medium-deep holes being set to 15-20m; the hole bottoms of the large-diameter deep holes and the medium-deep holes being staggered;

[0009] Preferably, the upper drilling roadway is two rows, ore pillars are arranged between the upper drilling roadways, the large-diameter deep holes are vertically arranged, and the large-diameter deep holes are divided into pillar holes, intermediate holes and edge holes according to the positions of the blast holes; wherein the pillar holes are blast holes adjacent to the ore pillars, the edge holes are blast holes adjacent to the stope boundary, and the remaining holes are intermediate holes; the row spacing of the edge holes is set to 2.0-2.6m, the row spacing of the pillar holes and the intermediate holes is set to 3.0-3.5m, and the edge holes can be densely arranged to form a relatively flat blasting surface at the edge of the ore room, thereby avoiding under-mining or over-mining to the greatest extent.

[0010] Preferably, the medium-deep holes are fan-shaped, the row spacing is set to 2.0m, and the hole bottom distance of blast holes in the same row is set to 2.6-3.0m;

[0011] S3, arranging the charging structure: the large-diameter deep holes in the upper sublevel adopt an interval charging structure in which explosive layers and interval layers are arranged in sequence, the orifice is provided with a non-charging section of no less than 5m, and 3.0-3.5m of granular material is filled in the non-charging section; the medium-deep holes in the lower sublevel adopt a continuous charging structure, 3 rows are taken as one cycle, the orifice of the last row of blast holes in each cycle is provided with a non-charging section of no less than 5m and is blocked by 0.5m thick stemming, the first row of blast holes from the second cycle is fully charged to the orifice and is left with a length of 0.4-0.5m for stemming blocking, and the remaining rows of blast holes are normally charged according to full-height blasting; this charging structure can leave a section of rock as a brow line opening in each blasting cycle to protect the brow line opening, thereby facilitating the charging operation of the second blasting cycle and effectively ensuring the safety of the operation;

[0012] Preferably, the explosive layers of the large-diameter deep holes are all filled with emulsion explosive, when the large-diameter deep holes are divided into pillar holes, intermediate holes and edge holes, 4 emulsion explosives are filled in the explosive layers of the pillar holes, 3 emulsion explosives are filled in the explosive layers of the intermediate holes, 4 emulsion explosives are filled in the explosive layers of the edge holes close to the orifice, and 2 emulsion explosives are filled in the remaining explosive layers; the purpose of this design is to adjust the charge amount according to the vibration bearing capacity of different regions on the basis of ensuring the blasting effect, thereby reducing the charge amount and the input cost, and avoiding the accumulation of blasting energy caused by large charge amount to damage the surrounding filling body and further cause phenomena such as rib spalling, ore dilution, etc., thereby ensuring production safety;

[0013] S4, arranging initiation network: arranging electronic digital detonator in the explosive layer near the bottom of the upper sublevel large-diameter deep hole, arranging detonating cord through the large-diameter deep hole to form an electronic digital detonator-detonating cord mixed initiation network; arranging initiation bullet at the bottom of the lower sublevel medium-deep hole, arranging detonator lead wire through the medium-deep hole to form a parallel initiation network; wherein, the initiation bullet is assembled by half of emulsified explosive and a single electronic detonator;

[0014] S5, setting blasting period: the upper sublevel large-diameter deep hole is taken as one blasting period with 3 rows, the interval time between adjacent initiation holes is set as 25 ms, the hole at the center of a single row is initiated first, and the remaining holes are initiated in a left-right jumping manner, and adjacent rows are initiated in turn; the lower sublevel medium-deep hole is taken as one blasting period with 3 rows, the hole at the center of a single row is initiated first, and the remaining holes are initiated in a left-right jumping manner, and adjacent rows are set with an interval time of no less than 65 ms between the first holes;

[0015] S6, blasting operation: the blasting period set in step S5 is used to preferentially perform lateral blasting operation of the upper sublevel large-diameter deep hole, and then lateral blasting operation of the lower sublevel medium-deep hole is performed, and the distance difference between the upper sublevel free surface and the lower sublevel free surface is kept no more than 10 m during the blasting operation process, so as to avoid continuous ore falling of the brow line during blasting of the lower sublevel, and to ensure that there is no insufficient blasting compensation space due to too large upper ore pile during blasting of the lower sublevel; after each blasting operation is completed, ore drawing operation is performed once;

[0016] Preferably, the ore drawing amount after upper sublevel blasting is 20-25 m according to the reserved height of the ore pile to the bottom of the upper tunneling lane, so as to ensure that there is enough free surface during upper sublevel blasting; the ore drawing amount after lower sublevel blasting is according to the first row of holes of the next blasting period of the sublevel, so as to ensure that there is enough charging space in the lower sublevel, and to improve the blasting success rate.

[0017] Advantages

[0018] One of the above technical solutions has the following advantages or beneficial effects:

[0019] 1) By using the combined use of medium-deep hole blasting mining method and large-diameter deep hole, the mining height of a single mining stage is increased by at least one time, the development engineering, mining preparation engineering and support engineering quantity are reduced by half, the mining cost is greatly reduced, the mining efficiency is greatly improved, and the economic benefit of the enterprise is greatly improved;

[0020] 2) By dividing the large-diameter deep hole into pillar holes, intermediate holes and edge holes, and setting different charging structures respectively, and setting a non-charging section of no less than 5 m at the hole, the use of explosive is effectively reduced, and the phenomena of ore adhesion, ore dilution, and mine roof collapse are reduced, and the economic and safety benefits of the enterprise are effectively improved;

[0021] 3) By using the upper sublevel advanced blasting, the lower sublevel delayed blasting, and the distance between the upper and lower sublevel free surfaces being not greater than 10m, the blasting operation success rate and safety are effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments thereof, when read in conjunction with the accompanying drawings:

[0023] Figure 1 is a partial mine area plan view of the present application;

[0024] Figure 2 is a longitudinal section view of a mine area of the present application;

[0025] Figure 3 is a schematic view of an upper sublevel blast hole arrangement of the present application;

[0026] Figure 4 is a schematic view of a large diameter deep hole charge structure of the present application;

[0027] Figure 5 is a schematic view of a lower sublevel Nth blast cycle blast hole arrangement of the present application;

[0028] Figure 6 is a schematic view of a first and last row blast hole charge structure of the lower sublevel Nth blast cycle of the present application;

[0029] Figure 7 is a schematic view of a blasting operation of the present application;

[0030] In the figure: Mining stage 1; Upper sublevel 101; Lower sublevel 102; Mine chamber 2; Upper rock drilling roadway 21; Pillar 211; Lower rock drilling roadway 22; Large diameter deep hole 3; Pillar hole 301; Intermediate hole 302; Edge hole 303; Explosive layer 31; Spacer layer 32; Electronic digital detonator 33; Medium depth hole 4; Initiating bullet 41; Ore pile 5. DETAILED DESCRIPTION

[0031] The present application will be further described in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present application are not limited thereto.

[0032] The following embodiments are described by taking a 15m wide stope (i.e. one mine chamber width) as an example:

[0033] The present application provides a medium depth hole-large diameter deep hole combined blasting mining method, comprising the following implementation steps:

[0034] S1, determine the mining stage 1: as Figure 1As shown, multiple mining stages 1 are arranged along the depth direction of the ore body to be mined, the mining height of each mining stage 1 is set to 55-72 m according to the lithology, each mining stage 1 is divided into an upper sublevel 101 and a lower sublevel 102, the mining height of the upper sublevel 101 and the lower sublevel 102 is determined according to the preset hole depth of the blast hole arranged in the sublevel, and a mining roadway is arranged at the lower part of each mining stage 1; as shown, Figure 2 As shown, the mining stage 1 of the embodiment is a 24 m to 79 m ore body, and the specific mining height is 55 m;

[0035] S2, arranging the development engineering and drilling blast holes: as shown, Figure 2 As shown, multiple ore rooms 2 are divided along the strike of the ore vein in the mining stage 1, and the width of each ore room 2 is 15 m, two rows of upper drill drifts 21 are arranged at the upper part of each ore room 2, ore pillars 211 are arranged between the upper drill drifts 21 to strengthen the support capacity of the ore room 2, multiple rows of φ150 mm large-diameter deep holes 3 are formed vertically downward in the upper sublevel 101 from the floor of the upper drill drift 21, and the hole depth of the large-diameter deep hole 3 is set to 30-55 m; the same row of large-diameter deep holes 3 is divided into ore pillar holes 301, intermediate holes 302 and edge holes 303 according to the position of the blast hole, wherein the ore pillar hole 301 is the blast hole adjacent to the ore pillar 211, the edge hole 303 is the blast hole adjacent to the stope boundary, and the remaining holes are the intermediate holes 302; the edge holes 303 are arranged densely, and the row spacing is set to 2.0-2.6 m, so that the edge of the ore room 2 forms a relatively flat blasting surface, and the maximum degree of under-mining or over-mining is avoided, and the row spacing of the ore pillar hole 301 and the intermediate hole 302 is set to 3.0-3.5 m, so as to reduce the engineering quantity of drilling blast holes; as shown, Figure 3 As shown, 20 large-diameter deep holes 3 are arranged in one blasting period, including 6 intermediate holes 302, 6 ore pillar holes 301 and 8 edge holes 303;

[0036] A lower drill drift 22 is arranged at the lower part of each ore room 2, and multiple rows of fan-shaped arranged medium-deep holes 4 are formed upward in the lower sublevel 102 from the roof of the lower drill drift 22, the hole depth of the medium-deep hole 4 is set to 15-20 m, the row spacing of the medium-deep hole 4 is set to 2.0 m, and the hole bottom distance of the same row of blast holes is set to 2.6-3.0 m, the number of each row of medium-deep holes 4 can be the same, or as shown, Figure 5 As shown, the odd and even rows are staggered to reduce the blasting interference of adjacent rows, that is, the number of blast holes of adjacent rows is different by one, and the number of blast holes of the interval row is the same; the hole bottom positions of the large-diameter deep hole 3 and the medium-deep hole 4 are arranged in a staggered manner, as shown, Figure 7 As shown, the hole depth of the medium-deep hole 4 is set to 20 m, the hole depth of the large-diameter deep hole 3 is set to 34 m, and 0.8-1.0 m thick ore body is reserved between the hole bottoms of the medium-deep hole 4 and the large-diameter deep hole 3 as a separation layer to prevent the blast holes arranged in the upper and lower sublevels from penetrating each other;

[0037] S3, arranging the charging structure:

[0038] As Figure 4 shown, the large-diameter deep hole 3 drilled in the upper section 101 in step S2 adopts a spaced charging structure with the explosive layer 31 and the interval layer 32 arranged in sequence, the explosive layer 31 is filled with emulsion explosive, the orifice is provided with a non-charging section not less than 5m, and 3.0-3.5m of granular material is filled in the non-charging section to avoid a large amount of ore turning over at the orifice and thus causing secondary processing; wherein, four emulsion explosives are filled in the explosive layer 31 of the ore pillar hole 301 (the height of the explosive layer 31 after filling is 1.26m), three emulsion explosives are filled in the explosive layer 31 of the middle hole 302 (the height of the explosive layer 31 after filling is 0.95m), four emulsion explosives are filled in the explosive layer 31 of the edge hole 303 close to the orifice (the height of the explosive layer 31 after filling is 1.26m), and two emulsion explosives are filled in the remaining explosive layer 31 (the height of the explosive layer 31 after filling is 0.63m); on the basis of ensuring the blasting effect, the charge amount is adjusted according to the vibration bearing capacity of different regions, compared with the traditional charging structure, the explosive amount can be greatly reduced, the input cost is reduced, at the same time, the blasting energy accumulation caused by large charge amount can be avoided to damage the surrounding filling body, and further to cause the phenomena of slice collapse, ore dilution and the like, and the production safety is improved; in the embodiment, the explosive amount required by the traditional charging structure in a single blasting cycle is 6776Kg, and the explosive amount required by the charging structure of the embodiment is 5392Kg, about 20% of the explosive amount is saved;

[0039] As Figure 5 and Figure 6 shown, the medium-deep hole 4 in the lower section 102 in step S2 adopts a continuous coupling charging structure, with 3 rows as one cycle, the orifice of the last row of blast holes in each cycle is provided with a non-charging section not less than 5m and is blocked by 0.5m thick stemming, the first row of blast holes from the second cycle is fully charged to the orifice, a length of 0.4-0.5m is reserved for stemming blocking, and the middle row of blast holes is normally charged in full-height blasting mode, that is, the charging structure is set according to the minimum resistance line of blasting, which can reserve a section of rock as a brow line to protect the orifice, so as to facilitate the charging operation of the second blasting cycle and effectively ensure the safety of the operation;

[0040] S4, arranging an initiation network: the electronic digital detonator 33 is arranged in the explosive layer 31 close to the bottom of the large-diameter deep hole 3, the detonating cord is arranged through the large-diameter deep hole 3 to form an electronic digital detonator-detonating cord mixed initiation network; the initiation bullet 41 is arranged at the bottom of the medium-deep hole 4, and the detonator leg wire is arranged through the medium-deep hole 4 to form a parallel initiation network; wherein, the initiation bullet 41 is assembled by half emulsion explosive and a single electronic digital detonator;

[0041] S5, setting a blasting cycle:

[0042] The upper segment 101 large-diameter deep hole 3 is set as a blasting cycle with 3 rows, the interval time between adjacent initiation blast holes is set as 25 ms, the blast hole located in the center is initiated first, the rest of the blast holes are initiated in a left-right jumping manner, the adjacent rows of blast holes are sequentially initiated, as shown in Figure 3 one of the first row of blast holes 301 is set as 0 ms initiation, the other blast hole 301 in the same row is delayed for 20 ms, the third row of blast holes is adjacent to the first row of blast holes, after the first row of large-diameter deep holes 3 are completely blasted, the second row and the third row are sequentially blasted in the order described above;

[0043] The lower segment 102 medium-depth hole 4 is set as a blasting cycle with 3 rows, the blast hole located in the center is initiated first, the rest of the blast holes are initiated in a left-right jumping manner, the interval time between the first blast hole of adjacent rows is set as no less than 65 ms; as shown in Figure 5 the blast hole located in the center of the first row is set as 0 ms initiation, the rest of the blast holes are sequentially initiated in a left-right jumping manner with a delay of 20 ms, the blast holes located in the center of the middle row and the last row are respectively delayed for 65 ms and 130 ms, the rest of the blast holes are sequentially initiated in a left-right jumping manner with a delay of 20 ms from the initiation time of the first blast hole in the same row;

[0044] S6, blasting operation: as shown in Figure 7 the blasting cycle set in step S5, the lateral blasting operation of the upper segment 101 large-diameter deep hole 3 is performed first, and then the lateral blasting operation of the lower segment 102 medium-depth hole 4 is performed, each round of blasting operation includes a large-diameter deep hole 3 blasting cycle and a medium-depth hole 4 blasting cycle, the distance difference between the free surface of the upper segment 101 and the free surface of the lower segment 102 is kept no more than 10 m during the blasting operation, so as to avoid the continuous ore falling of the brow line during the blasting of the lower segment 102, and to ensure that there is enough blasting compensation space during the blasting of the lower segment 102 due to the large upper ore pile, after each blasting operation, the ore is discharged, the discharge amount after the blasting of the upper segment 101 is 20-25 m according to the reserved height of the ore pile 5 to the bottom plate of the upper drilling roadway 21, so as to ensure that there is enough free surface during the blasting of the upper segment 101; the discharge amount after the blasting of the lower segment 102 is according to the first row of blast holes of the next blasting cycle of the segment, so as to ensure that there is enough charging space during the next cycle charging operation of the lower segment 102, thereby improving the blasting success rate.

[0045] The above is only a preferred embodiment of the present application, and does not limit the technical scope of the present application in any way, so any slight modification, equivalent change and modification made according to the technical essence of the present application to the above embodiment still belongs to the protection scope of the present application.

Claims

1. A combined medium-length hole-large diameter long hole blasting mining method, characterized in that, The method comprises the following steps: S1, determining the stoping stage: arranging a plurality of stoping stages along the depth direction of the ore body to be mined, setting the mining height of each stoping stage to 55-72 m according to the lithology, dividing each stoping stage into an upper sublevel and a lower sublevel, and setting a mining gateway at the lower part of each stoping stage; S2, arranging the mining preparation engineering and drilling and blasting holes: dividing a plurality of ore rooms along the strike of the ore vein in each stoping stage, arranging an upper drilling gateway at the upper part of each ore room, and forming a plurality of large-diameter deep holes in the upper sublevel by downward construction, wherein the hole depth of the large-diameter deep holes is set to 30-55 m; arranging a lower drilling gateway at the lower part of each ore room, forming a plurality of medium-deep holes in the lower sublevel by upward construction, wherein the hole depth of the medium-deep holes is set to 15-20 m; and the hole bottoms of the large-diameter deep holes and the medium-deep holes are arranged in a staggered manner; S3, arranging the charging structure: the large-diameter deep holes in the upper sublevel adopt an interval charging structure in which explosive layers and interval layers are arranged in sequence, the orifice is provided with a non-charging section of not less than 5 m, and 3.0-3.5 m of granular material is filled in the non-charging section; the medium-deep holes in the lower sublevel adopt a continuous charging structure, 3 rows are taken as one cycle, the orifice of the last row of blast holes in each cycle is provided with a non-charging section of not less than 5 m and is blocked by 0.5 m thick stemming, the first row of blast holes from the second cycle is fully charged to the orifice and is blocked by 0.4-0.5 m long stemming, and the remaining rows of blast holes are normally charged according to full-height blasting; S4, arranging the detonation network: electronic digital detonators are arranged in the explosive layer close to the hole bottom of the large-diameter deep holes in the upper sublevel, and detonating cords are arranged through the large-diameter deep holes to form an electronic digital detonator-detonating cord mixed detonation network; detonation bullets are arranged at the hole bottoms of the medium-deep holes in the lower sublevel, and detonator leads are arranged through the medium-deep holes to form a parallel detonation network; S5, setting the blasting cycle: the large-diameter deep holes in the upper sublevel take 3 rows as one blasting cycle, the interval time between adjacent detonation blast holes is set to 25 ms, the blast holes located at the center of a single row of blast holes are detonated first, the remaining blast holes are detonated in a left-right jumping manner, and adjacent rows of blast holes are detonated in sequence; the medium-deep holes in the lower sublevel take 3 rows as one blasting cycle, the blast holes located at the center of a single row of blast holes are detonated first, the remaining blast holes are detonated in a left-right jumping manner, and adjacent rows of blast holes are set with an interval time of not less than 65 ms between the first blast holes; S6, blasting operation: the blasting cycle set in step S5 is used to preferentially perform lateral blasting operation of the large-diameter deep holes in the upper sublevel, and then perform lateral blasting operation of the medium-deep holes in the lower sublevel, and the distance difference between the free surfaces of the upper sublevel and the lower sublevel is maintained to be not greater than 10 m during the blasting operation; after each blasting operation is completed, one mining operation is performed.

2. The combined medium-length hole-large diameter deep hole blasting mining method according to claim 1, characterized in that: The large-diameter deep holes are vertically arranged, and the medium-deep holes are fan-shaped arranged in step S2.

3. The combined medium-length hole-large diameter hole blasting mining method according to claim 2, characterized in that: The row spacing of the medium-deep holes is set to 2.0 m, and the hole bottom distance of the same row of blast holes is set to 2.6-3.0 m.

4. The combined medium-length hole-large diameter deep hole blasting mining method according to claim 1, characterized in that: The upper drilling gateway in step S2 is two rows, and ore pillars are arranged between the upper drilling gateways.

5. The combined medium-length hole-large diameter hole blasting mining method according to claim 3, characterized in that: The large-diameter deep holes are divided into ore pillar holes, intermediate holes and edge holes according to the positions of the blast holes in step S2.

6. The combined medium-length hole-large diameter deep hole blasting mining method according to claim 5, characterized in that: The row spacing of the edge holes is set to 2.0-2.6 m, and the row spacing of the ore pillar holes and the intermediate holes is set to 3.0-3.5 m.

7. The combined medium-length hole-large diameter hole blasting mining method according to claim 4, characterized in that: The emulsion explosive is filled in the explosive layer of the large-diameter deep hole in step S3, wherein 4 emulsion explosives are filled in the explosive layer of the pillar hole, 3 emulsion explosives are filled in the explosive layer of the middle hole, 4 emulsion explosives are filled in the explosive layer close to the orifice of the side hole, and 2 emulsion explosives are filled in the remaining explosive layers.

8. The combined medium-length hole-large diameter deep hole blasting mining method according to claim 1, characterized in that: The detonator head in step S4 is assembled by half emulsion explosive and single electronic detonator.

9. The combined medium-length hole-large diameter hole blasting mining method according to claim 1, characterized in that: In step S6, the ore output after the upper segment blasting is 20-25 m in the emptying height from the ore pile to the floor of the upper drilling roadway, and the ore output after the lower segment blasting is the first row of blast holes exposed to the next blasting period of the segment.

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