CN112211639A - One-step well completion method for high-depth large-section medium-deep hole - Google Patents
One-step well completion method for high-depth large-section medium-deep hole Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000005520 cutting process Methods 0.000 claims abstract description 33
- 238000010276 construction Methods 0.000 claims abstract description 18
- 239000002360 explosive Substances 0.000 claims description 37
- 239000011435 rock Substances 0.000 claims description 32
- 238000005553 drilling Methods 0.000 claims description 25
- 230000002093 peripheral effect Effects 0.000 claims description 25
- 238000005422 blasting Methods 0.000 claims description 19
- 230000000977 initiatory effect Effects 0.000 claims description 13
- 238000013461 design Methods 0.000 claims description 11
- 238000005065 mining Methods 0.000 claims description 8
- 238000005474 detonation Methods 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 7
- 239000003814 drug Substances 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 6
- 239000000839 emulsion Substances 0.000 claims description 6
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000009412 basement excavation Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000005641 tunneling Effects 0.000 description 3
- 210000003462 vein Anatomy 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
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- 239000010977 jade Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005312 nonlinear dynamic Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
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- 238000009423 ventilation Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D3/00—Raising shafts, i.e. working upwards from the bottom
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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Abstract
The invention belongs to the technical field of underground mine excavation, and particularly relates to a one-time well-forming construction process for a medium-length hole of an underground mine cutting raise (vertical well), which can replace manual construction of the cutting raise, in particular to a one-time well-forming method for a high-depth large-section medium-length hole.
Description
Technical Field
The invention relates to a high-depth large-section medium-deep hole one-step well completion method. Belongs to the technical field of underground mine excavation, in particular to a once-through well construction process for medium-length holes of underground mine cutting patios (vertical wells), which can replace manual construction cutting patios.
Background
The cut raise is a vertical upward roadway excavated to meet the requirement of having enough compensation space during blasting when a sill pillar-free sublevel caving method is used for mining. The construction process of the prior art is a common upward digging method, the width of a cutting raise is 2.2m, the length of the cutting raise is 3.5m, and the height of the cutting raise is 10.5-14 m, in the method, from bottom to top, in the operation and construction process, personnel firstly reach an operation position through a ladder stand, then cross round steel is penetrated on an anchor rod which is drilled on two walls of the raise along the length direction to be used as a supporting beam, a screen plate is laid on the supporting beam to erect a working platform, then perforation and charging operation are carried out, and the platform is required to be removed during blasting; once per cycle, a working platform needs to be erected. The caving ore directly falls on the floor of the roadway, and rock slag is shoveled out by using shoveling and transporting equipment, the construction method is simple, higher operation technology is not needed, and the method is still widely adopted by domestic mines at present.
The search literature discloses: (1) in the book of design and construction of shaft and drift published by 2008 published metallurgical industry press, Li chang' and Yang Jiang, workers enter a shaft to operate when a well construction method is adopted. The common method has a potential head of being eliminated … …' the common method is a well-established old method, and in order to avoid heavy rock loading work and drainage work, when the common method is adopted to dig the construction raise, the raise is generally dug from bottom to top. The working platform is required to be erected and dismantled in each cycle, and equipment are required to be carried, so that the labor intensity is high, the tunneling speed is low, the working efficiency is low, the material consumption is high, and the phenomena of mine gunfume poisoning and well falling are easy to occur. Obviously, the method cannot meet the requirement of ever-increasing development of the mining industry in China. The suspension method should be popularized and used rapidly, and the deep hole method should be used in the test. "is used herein. (2) The Wangqing and the ren Feng jade have the content of 'cutting raise groove, when the cutting drift is inconvenient to dig, only digging the cutting raise at the end part of a stoping roadway, and the section is a rectangle with the size of 1.5m multiplied by 2.5 m' in the book 'mining science' published by 2012 publication of metallurgy industry. (3) The 9-hole barrel-shaped cut primary well forming technology published by Zhao nationality, Zhao Jingqing and Li Jueyue in 2013 science and technology includes blasting well forming parameters including 4 hollow hole cutting modes, charge hole and hollow hole diameters of 0.11 and 0.25m, cut hole and hollow hole interval of 0.46m, numerical simulation of the key cut process of 9-hole barrel-shaped cut primary well forming process with nonlinear dynamic analysis software LS-DYNA to obtain visual 9-hole barrel-shaped cut cavity forming process, and final experiment with some open pit as free surface based on theoretical analysis and numerical simulation, a23.4 m raise is formed by one explosion, and the content of the raise section is expressed as 4m multiplied by 4m ".
From the above information: the cutting raise (vertical well) mechanization is particularly important, and a one-time well forming technology is popularized and used, and needs continuous test improvement. The existing method is complicated and has high safety risk; the one-time well formation technology used by underground mines of domestic enterprises is low in height and small in section, and cannot meet the production requirements of most mines.
Disclosure of Invention
The invention aims to provide a high-depth large-section medium-length hole one-step well completion method, which can solve the problem of complicated working procedures of the traditional method, reduce the material consumption cost and the safety risk, avoid the occurrence of safety accidents, improve the operation conditions, reduce the labor intensity, greatly improve the tunneling speed and the working efficiency and provide favorable conditions for the continuous and balanced production of mines.
The high-depth large-section medium-deep hole one-time well completion method for achieving the purpose comprises the following steps:
(1) the rock drilling process adopts a DL2720 rock drilling trolley; the drill bit is improved: the charge hole drill bit uses an alloy drill bit with the diameter of phi 76mm to drill a hole with the diameter of phi 78 mm; the compensating hole drill bit adopts an alloy drill bit with the diameter of phi 100mm to drill a hole with the diameter of phi 102 mm;
(2) the blasting process comprises the following steps: the cutting mode adopts a hole distribution mode of angular column-shaped cutting;
1) and determining blasting parameters: the design section size is 3.2 multiplied by 4.2m, 2# rock emulsion explosive and rock expanded ammonium nitrate explosive are adopted, the specification of the cartridge is phi 32mm-300g and the cartridge is packed in a bag for 25 kg;
2) blast hole diameter and blast hole depth: the diameter of the blast hole is that a charging hole d =78mm and a compensation hole d =102 mm; depth of blast hole: the diameter of each blast hole depends on the design height of the raise, the utilization rate of the blast holes is 90-95%, the depth of each blast hole in an undercut hole is L =15m, the depths of the blast holes in the rest peripheral holes and auxiliary holes are L =14m, and the depth of each undercut hole is 1-1.5m deeper than that of each peripheral hole;
3) pitch of holes: and (3) cutting hole spacing: a =3-7r, wherein: r is the radius of the cartridge, the radius of the blast hole when the expanded explosive is adopted, a is the hole distance, the distance between the compensation large hole is 480mm, the distance between the compensation large hole and the central hole is 270mm, and the distance between the auxiliary hole and the peripheral hole is as follows: the holes are uniformly distributed, and the rock f = 12-18; the auxiliary hole is a =450 mm; taking a =550mm as a peripheral hole;
4) specific consumption of explosive: carrying out heavy planting on one cut raise with the unit consumption of the total explosive amount of 8-32 kg/m;
5) shot hole arrangement and number of shots: and (4) cutting holes: the device is designed into 23, 9 medicine-loading holes and 14 large-aperture compensation holes, the angle of each hole is 90 degrees, the holes are vertically upward, and the holes are uniformly arranged according to the principle that the formed cavities are not mutually extruded and punched; auxiliary holes: the number of the medicine containing holes is 26, the medicine containing holes are all arranged at the angle of 90 degrees and vertically face upwards, the minimum resistance lines are arranged at the distance of 500-600mm and are uniformly arranged around the cut holes; peripheral holes: 24 are designed, and the patios are uniformly distributed around the designed shape specification on the principle of ensuring the shape specification of the patio;
(3) the charge structure:
1) initiating explosive package: the position of the detonating explosive bag of the cut hole is 3m away from the hole opening, which is beneficial to slag discharge; the explosive consists of 3 sections of emulsion explosives, the energy-gathering holes of the detonators face to the hole bottom, and the positions of the auxiliary holes and the initiation explosive packages of the peripheral holes are positioned at the hole bottom, so that the ore rock is favorably crushed; laying a detonating cord in the blast hole, arranging a detonator at the position 3m from the orifice, and enabling the detonator energy-gathering hole to face to the bottom of the hole;
2) the charge structure: adopting columnar continuous charging, laying a detonating cord in the blast hole in full length, wherein the detonating cord exceeds the orifice by 0.5 m;
(4) a detonation network: adopting a non-electric initiation network, wherein the cut holes, the auxiliary holes and the peripheral holes are all initiated by adopting detonating tube detonators and detonating cords, the initiation mode adopts orifice forward initiation, a half-second detonating tube detonator is adopted, the interval time between the cut holes is 0.25-2.25s, and the interval time between the auxiliary holes and the peripheral holes is 2.26-4.75 s;
(5) filling: the blast hole is filled with stemming made of loess, and the blocking length is 0.2-0.5 m;
(6) section and height determination: and determining section specifications according to the hole distribution intervals, and determining the construction height of the raise according to the mining layering height and the ore body stoping height.
Determining the arrangement form and hole spacing of the angular cylindrical cut according to the performance of the existing explosive and determining the section and height of the cutting raise by combining the performance and production current situation of the existing medium-length hole drilling jumbo through the blasting and crushing mechanism of the rock and the stress wave principle in the rock; and optimizing and adjusting the detonation network according to the delay time of the half-second detonating tube detonator. The influence of perforation, hole plugging and filling on the effect of one-time well formation is analyzed, so that the hole distribution angle of the one-time well formation technology is optimally adjusted under the condition of limitation of specifications of roadways such as a vein-following roadway and a vein-penetrating roadway. Therefore, the method is applied to the high-mining process in different roadway specifications and different stages, and has great significance for optimizing the process of the cutting well (vertical well) and reducing the construction safety risk of the cutting well (vertical well).
Compared with the common method, the successful application of the construction technology of one-time well formation by high-depth large-section medium-length hole blasting shortens the construction period by 67 percent; the work efficiency is improved by more than 60 percent compared with the common method; the raise is 100% of the designed height, and the utilization rate of blast holes is 90-95%. The exploded ore rock falls by gravity, and toxic and harmful gases such as blast smoke and the like are discharged from the horizontal roadway, so that the ventilation time is reduced; the operations of rock drilling, charging, connecting, detonating and the like are all carried out in the horizontal roadway, the problems of complicated working procedures, reduced material consumption cost and safety risk are solved, and safety accidents are avoided. The production requirement of the underground mine and the technical requirement of cutting the pull groove are met, a finished mechanical operation line is formed, the operation condition is improved, and the labor intensity is reduced.
Detailed Description
A high-depth large-section medium-deep hole one-time well completion method comprises the following steps:
1. rock drilling process
1.1 drill jumbo
The DL2720 drilling jumbo is adopted, the drilling jumbo is high in drilling efficiency and few in faults, the maximum drilling height is 3.35m, and the drilling width is 6.11 m; the swing angle of the drill boom is +/-35 degrees; the drilling depth is 34m, the rock drilling aperture is 50-100mm, the average rock drilling efficiency is 210m, and the requirement of the tunneling raise for the height of 12-16m is met.
1.2 drill bit improvements
(1) Drill bit for charging hole
And (4) drilling holes by using an alloy drill bit with the diameter of 76mm, and forming the holes with the diameter of 78 mm. The drilling quality is good, the hole wall is smooth, the section is circular, the diameter of the blast hole changes uniformly, and the powder charging is facilitated.
(2) Compensation hole drill bit
In order to increase the free surface and the initial compensation space of the cut and improve the blasting effect, an alloy drill bit with the diameter of 100mm is adopted for drilling, and a hole is formed with the diameter of 102 mm. In order to prevent the deviation of hole positions during hole expansion, the drilling hole is formed by drilling once, so that the operation steps of expanding the hole and replacing a drill bit are reduced, and the drilling efficiency is high. When drilling rock with a large drill bit, care is taken to operate the drill opening to open gently, ensuring that the hole remains straight. The opening is continued until hard rock is contacted. During drilling, an operator can manually control the rotation speed and the propelling speed of the drilling machine through the operating rod.
2. The blasting process comprises the following steps:
2.1 slitting mode
The cutting form is one of important factors influencing the blasting efficiency and the blasting quality, and the feasibility of geological condition construction, the blasting effect and the economic rationality are considered. Meanwhile, the well formed by one-time explosive blasting is considered to reach the design height, and the reliability is required in the process. Through experimental comparison, the design adopts a hole distribution mode of an angular column-shaped cut.
2.2 determination of blasting parameters
The design section size is 3.2 multiplied by 4.2m, 2# rock emulsion explosive and rock expanded ammonium nitrate explosive (in bulk) are adopted, the specification of the cartridge is phi 32mm-300g, and the cartridge is packed in 25 kg.
(1) Blast hole diameter and blast hole depth: the diameter of the blast hole is that a charging hole d =78mm and a compensation hole d =102 mm; depth of blast hole: the diameter of the blast hole depends on the design height of the raise, and the utilization rate of the blast hole is 90-95%. The depth of blast holes of the cut hole is L =15m, and the depth of blast holes of the rest peripheral holes and auxiliary holes is L =14 m. The cut holes are 1-1.5m deeper than the peripheral holes.
(2) Pitch of holes: and (4) cutting holes: the smaller the compensation macropore distance is, the better the compensation macropore distance is, but in the rock drilling process, the mutual penetration phenomenon is frequent, and according to the blasting breaking mechanism of the rock and the stress wave principle in the rock, the distance is as follows: a =3-7r, wherein: r is the cartridge radius (the diameter of the blast hole is determined by adopting expanded explosive), and a is the hole interval. The distance between the compensation macropore and the central pore is 390mm, and the distance between the compensation macropore and the central pore is 270mm, the distance between the compensation macropore and the central pore is 480mm and is 250 mm through tests;
auxiliary holes and peripheral holes: the holes are uniformly distributed, so that not only is the explosive energy fully utilized, but also the explosive is guaranteed to collapse according to the designed contour line. Rock f = 12-18; the auxiliary hole is taken as a = 400-; taking a peripheral hole as a = 550-; according to experimental statistics: the auxiliary hole is a =450 mm; the perimeter hole was taken as a =550 mm.
(3) Specific consumption of explosive: total explosive charge of a cutting raise Q = qSLb eta (1-1)
Carrying out dry-end face excavation on the face of a square meter, wherein the face area of the excavation section of the S-roadway is obtained by taking S =13.44 square meters, the average depth of Lb-blast holes is taken, Lb =14.4m, and the utilization rate of the eta-blast holes is taken as 95 percent. The unit explosive consumption is related to factors such as ore rock properties, the section of the cutting raise, the sectional height, the explosive charging structure, the detonation mode and the like. Through field tests, under the condition of the Mongolian iron ore rock, the unit consumption of the raise (vertical well) is 8-32kg/m for carrying out the high-speed thin-wall steel planting.
Q =2206.3kg was calculated by the formula (1-1).
2.3 blast hole arrangement and number of blast holes
(1) And (4) cutting holes: the design is 23, 9 loading holes and 14 large-aperture compensation holes. The angle of each hole is 90 degrees, the holes are vertically upward and are uniformly arranged according to the principle that the formed slot cavities are not mutually extruded and punched.
(2) Auxiliary holes: the number of the medicine filling holes is 26, the medicine filling holes are all arranged in the medicine filling holes, the angle of each hole is 90 degrees, the hole is vertically upwards formed, and the principle of enlarging the cut area is taken as a principle. The minimum resistant line is arranged to be 500-600mm and is evenly arranged around the cut hole.
(3) Peripheral holes: the number of the designed raise shafts is 24, and the raise shafts are uniformly distributed around the designed shape specification on the principle of ensuring the shape specification of the raise shafts.
2.4 charging structure
(1) Initiating explosive package: the position of the detonating explosive bag of the cut hole is 3m away from the hole opening, which is beneficial to slag discharge; the explosive consists of 3 sections of emulsion explosive, and the energy-gathered holes of the detonator face to the bottom of the hole. The positions of the auxiliary holes and the initiation explosive packages of the peripheral holes are positioned at the bottom of the holes, so that ore rock crushing is facilitated; a detonating cord is laid in the blast hole, a detonator is arranged at the position 3m away from the hole opening, and the detonator energy-gathering hole faces to the bottom of the hole.
(2) The charge structure: in order to improve the cutting quality, columnar continuous charging is adopted, a detonating cord is laid in the blast hole in the full length, and the detonating cord exceeds the orifice by 0.5 m.
2.5 detonation network
And a non-electric initiation network is adopted, and the cut hole, the auxiliary hole and the peripheral hole are initiated by adopting a detonating tube detonator and a detonating cord. The detonation mode adopts orifice positive detonation. Because the section is large and the types of the stored detonators are limited, half-second detonating tube detonators are adopted, the interval time of the cut holes is 0.25-2.25s, and the interval time of the auxiliary holes and the peripheral holes is 2.26-4.75 s.
2.6 tampons
The blast hole is filled with stemming made of loess, and the blocking length is 0.2-0.5 m.
3. Section and height determination
And determining section specifications according to the hole distribution intervals, and determining the construction height of the raise according to the mining layering height and the ore body stoping height.
Example 1: the shape of the ore body is like a layer, irregular vein and parallel side-row vein, the ore body is inclined to NE, the thickness is 6-7m, the subsection height is 17m, according to the mining method and the upper and lower layering relation, the ore body is firstly mined and layered, the raise is designed at the end part of a roadway along the vein, and the design height is 14m;
1. the cutting well is designed to have the height of 14m, the section size of 3.2 x 4.2 and the total number of 71 holes, wherein 57 medicine-loading holes are provided with the hole depth of 14m, and 14 large-aperture empty holes are provided with the hole depth of 15 m.
2. After construction, the average depth of the loading holes is 14.4m and the average depth of the compensation holes is 15.3m through inspection and acceptance.
3. The cutting center is provided with 1 section, 3 sections, 5 sections and 7 sections of half-second detonating tube detonators, the auxiliary holes are sequentially provided with 8 sections and 9 sections of half-second detonating tube detonators, the peripheral holes are provided with 10 sections of half-second detonating tube detonators, and the drill way is adopted for forward detonating. The cut hole is connected with a detonating cord detonating blast hole through a half-second detonating tube detonator, and expanded ammonium nitrate explosive is bulked in the detonating blast hole.
After blasting, the height of the cutting raise after blasting is 14.2m, and the cutting raise height required by the extraction process is met.
Claims (1)
1. A high-depth large-section medium-deep hole one-step well completion method is characterized by comprising the following steps:
(1) the rock drilling process adopts a DL2720 rock drilling trolley; the drill bit is improved: the charge hole drill bit uses an alloy drill bit with the diameter of phi 76mm to drill a hole with the diameter of phi 78 mm; the compensating hole drill bit adopts an alloy drill bit with the diameter of phi 100mm to drill a hole with the diameter of phi 102 mm;
(2) the blasting process comprises the following steps: the cutting mode adopts a hole distribution mode of angular column-shaped cutting;
1) and determining blasting parameters: the design section size is 3.2 multiplied by 4.2m, 2# rock emulsion explosive and rock expanded ammonium nitrate explosive are adopted, the specification of the cartridge is phi 32mm-300g and the cartridge is packed in a bag for 25 kg;
2) blast hole diameter and blast hole depth: the diameter of the blast hole is that a charging hole d =78mm and a compensation hole d =102 mm; depth of blast hole: the diameter of each blast hole depends on the design height of the raise, the utilization rate of the blast holes is 90-95%, the depth of each blast hole in an undercut hole is L =15m, the depths of the blast holes in the rest peripheral holes and auxiliary holes are L =14m, and the depth of each undercut hole is 1-1.5m deeper than that of each peripheral hole;
3) pitch of holes: and (3) cutting hole spacing: a =3-7r, wherein: r is the radius of the cartridge, the radius of the blast hole when the expanded explosive is adopted, a is the hole distance, the distance between the compensation large hole is 480mm, the distance between the compensation large hole and the central hole is 270mm, and the distance between the auxiliary hole and the peripheral hole is as follows: the holes are uniformly distributed, and the rock f = 12-18; the auxiliary hole is a =450 mm; taking a =550mm as a peripheral hole;
4) specific consumption of explosive: carrying out heavy planting on one cut raise with the unit consumption of the total explosive amount of 8-32 kg/m;
5) shot hole arrangement and number of shots: and (4) cutting holes: the device is designed into 23, 9 medicine-loading holes and 14 large-aperture compensation holes, the angle of each hole is 90 degrees, the holes are vertically upward, and the holes are uniformly arranged according to the principle that the formed cavities are not mutually extruded and punched; auxiliary holes: the number of the medicine containing holes is 26, the medicine containing holes are all arranged at the angle of 90 degrees and vertically face upwards, the minimum resistance lines are arranged at the distance of 500-600mm and are uniformly arranged around the cut holes; peripheral holes: 24 are designed, and the patios are uniformly distributed around the designed shape specification on the principle of ensuring the shape specification of the patio;
(3) the charge structure:
1) initiating explosive package: the position of the detonating explosive bag of the cut hole is 3m away from the hole opening, which is beneficial to slag discharge; the explosive consists of 3 sections of emulsion explosives, the energy-gathering holes of the detonators face to the hole bottom, and the positions of the auxiliary holes and the initiation explosive packages of the peripheral holes are positioned at the hole bottom, so that the ore rock is favorably crushed; laying a detonating cord in the blast hole, arranging a detonator at the position 3m from the orifice, and enabling the detonator energy-gathering hole to face to the bottom of the hole;
2) the charge structure: adopting columnar continuous charging, laying a detonating cord in the blast hole in full length, wherein the detonating cord exceeds the orifice by 0.5 m;
(4) a detonation network: adopting a non-electric initiation network, wherein the cut holes, the auxiliary holes and the peripheral holes are all initiated by adopting detonating tube detonators and detonating cords, the initiation mode adopts orifice forward initiation, a half-second detonating tube detonator is adopted, the interval time between the cut holes is 0.25-2.25s, and the interval time between the auxiliary holes and the peripheral holes is 2.26-4.75 s;
(5) filling: the blast hole is filled with stemming made of loess, and the blocking length is 0.2-0.5 m;
(6) section and height determination: and determining section specifications according to the hole distribution intervals, and determining the construction height of the raise according to the mining layering height and the ore body stoping height.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113983883A (en) * | 2021-10-27 | 2022-01-28 | 湖南柿竹园有色金属有限责任公司 | Deep hole internal subsection energy-gathering detonation once-through well completion method |
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| CN103306679A (en) * | 2013-05-21 | 2013-09-18 | 马钢(集团)控股有限公司 | '|'-shaped free surface holing one-step well completion technology |
| CN103758524A (en) * | 2013-12-30 | 2014-04-30 | 安徽水安建设集团股份有限公司 | Stage blasting tunneling vertical shaft construction method |
| CN105466292A (en) * | 2015-12-29 | 2016-04-06 | 大同煤矿集团有限责任公司 | Medium-length hole blasting technology used in semi-coal-rock roadway |
| CN108374661A (en) * | 2018-02-06 | 2018-08-07 | 浙江省隧道工程公司 | A kind of middle pilot shaft shaft formatting by one blasting method |
| CN109341449A (en) * | 2018-10-22 | 2019-02-15 | 临沂会宝岭铁矿有限公司 | A kind of high courtyard primary drilling Discrete control explosion well completion method of big section |
| CN110671979A (en) * | 2019-08-19 | 2020-01-10 | 西北矿冶研究院 | Controlled blasting method for forming cutting well by deep hole extrusion blasting |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113983883A (en) * | 2021-10-27 | 2022-01-28 | 湖南柿竹园有色金属有限责任公司 | Deep hole internal subsection energy-gathering detonation once-through well completion method |
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