CN114033373B - Reverse well drilling machine-medium deep hole differential blasting collaborative primary grooving method - Google Patents
Reverse well drilling machine-medium deep hole differential blasting collaborative primary grooving method Download PDFInfo
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- CN114033373B CN114033373B CN202111233085.4A CN202111233085A CN114033373B CN 114033373 B CN114033373 B CN 114033373B CN 202111233085 A CN202111233085 A CN 202111233085A CN 114033373 B CN114033373 B CN 114033373B
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- 238000005422 blasting Methods 0.000 title claims abstract description 43
- 238000005553 drilling Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000005520 cutting process Methods 0.000 claims abstract description 50
- 239000002360 explosive Substances 0.000 claims abstract description 39
- 238000010276 construction Methods 0.000 claims abstract description 30
- 238000005192 partition Methods 0.000 claims abstract description 26
- 238000004880 explosion Methods 0.000 claims abstract description 6
- 238000005474 detonation Methods 0.000 claims description 15
- 239000004576 sand Substances 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 2
- 239000011707 mineral Substances 0.000 claims description 2
- 239000003999 initiator Substances 0.000 abstract description 5
- 239000011435 rock Substances 0.000 description 8
- 125000006850 spacer group Chemical group 0.000 description 6
- 238000009826 distribution Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 241000779819 Syncarpia glomulifera Species 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000002367 phosphate rock Substances 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 239000001739 pinus spp. Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229940036248 turpentine Drugs 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
The invention discloses a cooperative one-time grooving method for reverse well drilling machine-medium deep hole differential blasting, which comprises the following steps: step 1: in the upper and lower cutting tunnels, a construction chamber is excavated in the cutting tunnel positioned above; step 2: drilling down a guide hole communicated with a cutting roadway below by using a back-up drilling machine, wherein the guide hole is drilled from top to bottom firstly when the guide hole is drilled, and then reaming is performed by replacing a reaming bit from bottom to top to obtain the guide hole; step 3: drilling a plurality of medium-length holes which are communicated with the cutting roadway positioned below in the periphery of the guide hole by utilizing a medium-length hole trolley in the cutting roadway positioned above; step 4: two ends in each medium-length hole are respectively filled with a partition piece, and a plurality of explosive bags are filled in each medium-length hole between the two partition pieces at intervals along the up-down direction; step 5: a plurality of charges are electrically connected to the initiator. Thus not only can effectively control and reduce the explosive quantity, but also can reduce the explosion hazard.
Description
Technical Field
The invention belongs to the field of mining, and particularly relates to a method for forming grooves at one time by cooperation of a well reversing drill and medium-length hole differential blasting.
Background
In the phosphorite exploitation process, the cutting groove is the last link that needs to be prepared before exploiting the room, and its purpose is to provide initial free surface and compensation space for stope blasting, and its formation speed, formation quality directly influence ore blasting uniformity, ore recovery rate and stope's production efficiency.
The conventional cutting groove forming method includes: (1) a cutting gallery and cutting courtyard combined groove pulling method; (2) cutting a patio draw groove method; and (3) a blast hole blasting slot-drawing method. The first two methods need to draw a groove by taking a cutting courtyard as a blasting free surface, but the cutting courtyard is difficult to construct, the quality of the cutting groove is difficult to ensure, the construction progress is slow, the cost is high, and the ore recovery rate is seriously affected; the third method belongs to a cutting-free raise grooving method, and can be subdivided into a wedge-shaped slitting one-time blasting grooving method and a fractional blasting grooving method, wherein the method uses a cutting roadway to drill sector holes with different angles from bottom to top, and the cutting groove is formed by one or multiple blasting, but the method is difficult to construct, and the construction needs to be performed for multiple blasting to cause stratum disturbance, particularly roof fall accidents are easily caused in the construction of a mineral body with multiple joints and cracks, the mine operation safety is seriously influenced, and the construction cost is higher.
The invention patent with the application number of CN202010297297.8 discloses a method for combining a vertical hole with a cutting-free raise-shaft slot pulling method. The groove pulling method comprises the following steps: s1, arranging a lower layered rock drilling lane, an upper layered rock drilling lane, a ore drawing lane and an ore loading access, and constructing a lower layered cutting horizontal lane by arranging the lower layered rock drilling lane on a lower plate of an ore body and perpendicular to the lower layered rock drilling lane; s2, constructing downward holes with preset inclination angles at positions corresponding to the upper layered rock drilling lane and the lower layered cutting horizontal lane by using a down-the-hole drill, wherein the blast holes of the downward holes incline towards two sides of the rock drilling lane and form a first included angle with a horizontal plane, the angle of the first included angle is adjusted according to the width of a falling area of a lower ore body, and the blast holes of the downward holes incline towards the rock drilling lane and form a second included angle with the horizontal plane; s3, after the construction of the downward holes in the step S2 is completed, using the lower ore body caving area and the lower layered cutting horizontal lane as blasting free surfaces, sequentially blasting towards the ore body lower disc according to the downward hole row surfaces, blasting face-discharging blastholes with 2 symmetrical hole sites each time, discharging ores after blasting to form a first blasting space, and using the first blasting space as a part of a cutting vertical groove; s4, constructing upward fan-shaped slotted holes in the lower layered cutting horizontal roadway according to plum blossom type arrangement; and S5, after the construction of the upward fan-shaped slotted hole in the step S4 is completed, performing sectional blasting by combining the first blasting space formed after the downward hole blasting in the step S3 and a lower layered cutting horizontal lane provided with the upward fan-shaped slotted hole in the step S4 to form a free surface, so as to form a complete cutting vertical slot. However, this method has problems: the multiple blasting vibration and impact of the upward and downward holes increase the blasting safety risk and the blasting cost; aiming at the top plate with multiple broken or joint surfaces, the upward hole construction safety is poor, the construction difficulty is high, and the construction period increment, the cost increment and the safety risk of operators caused by the processing of the suspended roof problem of the cutting groove are increased.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a reverse well drilling machine-medium deep hole differential blasting collaborative one-time grooving method which can quickly form a cutting groove and reduce the blasting operation times in the groove forming process.
In order to achieve the above object, the technical scheme of the present invention is as follows: a reverse well drilling machine-medium deep hole differential blasting collaborative one-time grooving method is used for providing an initial free surface and a compensation space for blasting in stope, and comprises the following steps:
step 1: in the upper cutting roadway and the lower cutting roadway, a construction chamber is excavated in the upper cutting roadway, and a concrete base is poured at the bottom of the construction chamber;
step 2: installing a back-up drilling machine on a concrete base of the construction chamber, and downwards drilling a guide hole communicated with the cutting roadway below by using the back-up drilling machine, wherein the guide hole is drilled from top to bottom firstly when the guide hole is drilled, and then a reaming bit is replaced to ream from bottom to top to obtain the guide hole;
step 3: drilling a plurality of medium-deep holes communicated with the lower cutting roadway in the upper cutting roadway by utilizing a medium-deep hole trolley at the periphery of the guide hole, and blowing high-pressure air flow into the medium-deep holes after the medium-deep holes are drilled for hole cleaning;
step 4: two ends in each medium-length hole are respectively filled with a partition piece, a plurality of explosive bags are filled in each medium-length hole between two partition pieces at intervals along the up-down direction, and a partition piece is arranged between two adjacent explosive bags for partition;
step 5: and (3) electrically connecting a plurality of explosive charges with an initiator, wherein the initiator controls the explosive charges in each medium-length hole to explode at intervals sequentially from bottom to top, and the explosion interval time of two adjacent explosive charges in the same medium-length hole is 10-50 milliseconds.
In the technical scheme, the compressive capacity of the concrete base in the step 1 is more than or equal to 240T, and the tensile capacity is more than or equal to 30T.
In the technical scheme, the aperture of the guide hole is 1200-1800mm.
In the technical scheme, the aperture d of the medium-deep hole is 90-123mm, the density coefficient is 0.8-1.1, and the minimum resistance line is 23-40d.
In the above technical solution, in each of the medium-deep holes in step 4, the length of the partition member located below is 0.5-0.6m, and the length of the partition member located above is 1.5-1.6m.
In the technical scheme, the partition piece is a sand bag.
In the above technical scheme, the plurality of medium-length holes are divided into a plurality of rows, each row is provided with at least two medium-length holes, and the plurality of medium-length holes are enclosed at the periphery of the guide hole.
In the above technical scheme, eighteen medium-length holes are arranged, and a plurality of medium-length holes are divided into five rows, wherein the third row is provided with two, the rest is provided with four, and the guide holes are positioned between the two medium-length holes in the third row.
In the above technical solution, the plurality of medium-deep holes in the second row, the third row and the fourth row are a first medium-deep hole group, the plurality of medium-deep holes in the first row and the fifth row are a second medium-deep hole group, wherein the detonation time of the explosive charges at the lowest end in each of the medium-deep holes in the first medium-deep hole group is the same, the detonation time of the explosive charges at the lowest end in each of the medium-deep holes in the second medium-deep hole group is the same, and the detonation time of the explosive charges at the lowest end in each of the medium-deep holes in the second medium-deep hole group is 10-50 ms later than the detonation time of the explosive charges at the lowest end in each of the medium-deep holes in the first medium-deep hole group.
The invention has the beneficial effects that: the inverted well drilling machine is utilized to realize the excavation of the guide hole, so that a larger compensation space is provided for bottom pulling blasting, the free surface is formed at a high speed, and the construction safety is high;
the medium-deep hole and the guide hole are blasted into the groove at one time, so that the safety risk of the operation under the suspended roof of the cutting groove is avoided, the construction period is shortened, and the construction cost is reduced;
the method has the advantages of simple process, flexible construction and one-step molding, can furthest reduce vibration and impact caused by multiple blasting, is beneficial to improving the quality of a cutting groove and reducing the accident probability caused by manual misoperation in blasting operation;
the explosive charges in the single medium-length hole are gradually blasted, and the plurality of medium-length holes are grouped and detonated successively, so that the explosive quantity can be effectively controlled and reduced, and the blasting hazard can be reduced.
Drawings
FIG. 1 is a vertical view distribution diagram of an upper and a lower cutting lanes and a guide hole;
FIG. 2 is a schematic view of a construction pilot hole;
FIG. 3 is a schematic diagram showing the distribution of medium-length holes and guide holes;
FIG. 4 is a schematic view of the inclination of five deep holes in the vertical plane;
FIG. 5 is a schematic view of the distribution of the partitions, spacers and charges within a single medium-deep hole.
In the figure: 1 cutting tunnel, 11 construction chamber, 12 concrete base, 2 guiding hole, 3 medium deep hole, 4 partition piece, 5 explosive package, 6 spacer.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention. The invention is more particularly described by way of example in the following paragraphs with reference to the drawings. Advantages and features of the invention will become more apparent from the following description and from the claims. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
As shown in fig. 1-5, the embodiment provides a method for collaborative primary grooving of reverse well drilling machine-medium deep hole differential blasting, which is used for providing a blasting initial free surface and a compensation space for stope, and comprises the following steps:
step 1: in the upper and lower cutting tunnels 1, a construction chamber 11 is excavated in the cutting tunnel 1 positioned above (the bottom plate of the construction chamber is to be flat without the loose stone scum), and a concrete base 12 is poured at the bottom of the construction chamber 11;
step 2: installing a well reversing drill on a concrete base 12 of the construction chamber 11, and downwards drilling a guide hole 2 communicated with the cutting roadway 1 positioned below by using the well reversing drill;
step 3: drilling a plurality of medium-length holes 3 penetrating through the cutting roadway 1 positioned below in the periphery of the guide hole 2 by using a medium-length hole trolley in the cutting roadway 1 positioned above, and blowing high-pressure air flow into the medium-length holes 3 after the medium-length holes 3 are drilled to perform hole cleaning treatment (removing rock slag in the medium-length holes);
step 4: two ends in each medium-length hole 3 are respectively filled with a partition member 4, a plurality of explosive cartridges 5 are filled in each medium-length hole 3 between two partition members at intervals along the up-down direction, and a partition member 6 is arranged between two adjacent explosive cartridges 5 for partition;
step 5: and (3) electrically connecting a plurality of explosive charges 5 with an initiator, wherein the initiator controls the explosive charges 5 in each medium-length hole 3 to sequentially explode at intervals from bottom to top, and the explosion interval time of two adjacent explosive charges 5 in the same medium-length hole 3 is 10-50 milliseconds.
Preferably, the vertical distance between the two cutting roadways is 18-22m.
In the above technical solution, the concrete foundation 12 in step 1 (the dimensions thereof are preferably 5-6m long, 2.2-2.8m wide and 280-400mm thick) has a compressive capacity of not less than 240T and a tensile capacity of not less than 30T.
In the above technical scheme, the aperture of the guide hole 2 is 1200-1800mm.
In the technical scheme, the aperture d of the medium-deep hole 3 is 90-123mm, the density coefficient is 0.8-1.1, and the minimum resistance line is 23-40d.
In the above technical solution, the length of the partition member located below in each medium deep hole 3 in the step 4 is 0.5-0.6m, and the length of the partition member 4 located above is 1.5-1.6m.
In the above technical solution, the partition member 4 is a sand bag.
In the above technical solution, the plurality of medium-deep holes 3 are divided into a plurality of rows, each row has at least two medium-deep holes 3, and the plurality of medium-deep holes 3 are enclosed at the periphery of the guide hole 2.
In the above technical solution, eighteen medium-deep holes 3 are provided, and a plurality of medium-deep holes 3 are divided into five rows, wherein the third row is provided with two, and the rest is provided with four, and the guiding holes 2 are located between the two medium-deep holes 3 in the third row, the distance between the two outermost medium-deep holes in the same row is about 2m, and the water distance between the first row and the fifth row is about 4 m.
Preferably, the middle deep holes of the first row and the middle deep holes of the fifth row, the middle deep holes of the second row and the middle deep holes of the fourth row are respectively and symmetrically distributed along the axial center of the guide hole, wherein the inclined included angles of the middle deep holes of the first row, the second row, the fourth row and the fifth row along the horizontal plane are 90 degrees to 80 degrees vertically, and the two middle deep holes of the third row are vertically arranged (namely, the inclined included angles with the horizontal plane are 90 degrees).
In the above technical solution, the plurality of medium-deep holes 3 in the second, third and fourth rows are a first medium-deep hole group, and the plurality of medium-deep holes 3 in the first and fifth rows are a second medium-deep hole group, where the detonation time of the explosive charges 5 at the lowest end in each of the medium-deep holes 3 in the first medium-deep hole group is the same, the detonation time of the explosive charges at the lowest end in each of the medium-deep holes 3 in the second medium-deep hole group is the same, and the detonation time of the explosive charges 5 at the lowest end in each of the medium-deep holes 3 in the second medium-deep hole group is 10-50 ms later than the detonation time of the explosive charges 5 at the lowest end in each of the medium-deep holes 3 in the first medium-deep hole group.
Wherein the spacer 6 is a sand bag or a lifting type gas spacer, and the length of the spacer is 0.5-0.6m.
Example 1
Implementation background: the method comprises the following specific construction steps that a certain phosphorite-mining area is a steep inclined medium-thickness deposit, the inclination angle of a ore body is 51-82 degrees, the average thickness of the ore body is 71 degrees, the average thickness of the ore body in the mining area is 7.50m, the trend length of the ore body is 660m, the ore block length is 60m, the middle section height is 60m, the sectional height is 15m, the ore room length is 60m, no stud and top and bottom pillars are arranged, a reverse well drilling machine-medium deep hole differential blasting cooperative one-time grooving method is adopted, the number of draw grooves is 79, and the specific construction steps are as follows:
(1) Based on stope conditions, a construction chamber is dug in a cutting gallery positioned above, and a bottom plate of the construction chamber is leveled without turpentine scum; pouring concrete base at the midpoint of the hole site to enable the concrete base to be positioned on the bedrock surface, wherein the dimensions of the concrete base are 5.3m long, 2.5m wide and 300mm thick, the compressive capacity of the concrete base is not less than 240T, and the tensile capacity of the concrete base is not less than 30T;
(2) Installing a well reversing drilling machine on a concrete base, drilling a drill hole with the diameter of 241mm from top to bottom, and replacing a drill bit at the lower end of a drill rod to be a reaming bit with the diameter of 1400mm after the drill hole is communicated with a cutting gallery below, so as to ream the drill hole from bottom to top to obtain a guide hole;
(3) Using a medium-length hole trolley, drilling eighteen medium-length holes with the diameter d of 120mm, the hole depth of 15m, the density coefficient of 1.0 and the minimum resistance line of 30d at the periphery of a large guide hole 5, wherein eighteen medium-length holes are divided into five rows, wherein the third row is provided with two medium-length holes, the rest is provided with four medium-length holes, the guide hole is positioned between the two medium-length holes of the third row, preferably, the medium-length holes of the first row and the medium-length holes of the fifth row, the medium-length holes of the second row and the medium-length holes of the fourth row are respectively distributed symmetrically at the center of the axis of the guide hole, the included angles of the medium-length holes of the first row and the horizontal plane are all 87 degrees, the included angles of the medium-length holes of the third row and the horizontal plane are all 90 degrees, the included angles of the medium-length holes of the fourth row and the horizontal plane are all 89 degrees, the medium-length holes of the fifth row and the horizontal plane are all 87 degrees, the distance between the outermost two medium-length holes of each row is about 2m, and the left-right distance between the first row and the second row is 4 m;
(4) After the drilling is finished, the medium-deep holes are firstly subjected to high-pressure air hole cleaning, three explosive bags are arranged in each medium-deep hole at intervals along the up-down direction, two ends of each medium-deep hole are respectively blocked by cloth bags (sand bags) filled with fine sand, wherein the length of the sand bag at the upper end of each medium-deep hole is 1.5m, the length of the sand bag at the lower end of each medium-deep hole is 0.5m, and a lifting type gas spacer is adopted between every two adjacent explosive bags to partition (the length is 0.5 m).
(5) And connecting an explosion network, wherein a plurality of explosive charges in the same medium-length hole are sequentially detonated from bottom to top, the detonation time interval of two adjacent explosive charges is 10 milliseconds, wherein the explosive charges at the lowest end in each medium-length hole of the second row, the third row and the fourth row are detonated simultaneously, the explosive charges at the lowest end in each medium-length hole of the first row and the fifth row are detonated simultaneously, the detonation time is 10 milliseconds later than the detonation time of the explosive charges at the lowest end in the medium-length hole of the second row, and a cutting groove with the ore body thickness of about 2m is formed after the explosion.
The cutting groove formed by the method is good in operation environment, short in operation period, good in blasting forming and good in economic effect, and safe production is effectively ensured.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (6)
1. The method for forming the groove at one time by cooperation of the reverse well drilling machine and medium-length hole differential blasting is used for providing an initial blasting free surface and a compensation space for stope of a mineral room and is characterized by comprising the following steps of:
step 1: in the upper cutting roadway (1) and the lower cutting roadway (1), a construction chamber (11) is excavated in the upper cutting roadway (1), and a concrete base (12) is poured at the bottom of the construction chamber (11);
step 2: installing a well reversing drilling machine on a concrete base (12) of the construction chamber (11), and downwards drilling a guide hole (2) communicated with the cutting roadway (1) below by using the well reversing drilling machine;
step 3: drilling a plurality of medium-length holes (3) communicated with the cutting roadway (1) positioned below in the periphery of the guide hole (2) by utilizing a medium-length hole trolley in the cutting roadway (1) positioned above, and blowing high-pressure air flow into the medium-length holes (3) after the medium-length holes (3) are drilled for hole cleaning;
step 4: two ends in each medium-length hole (3) are respectively filled with a partition member (4), a plurality of explosive bags (5) are arranged in each medium-length hole (3) between two partition members at intervals along the up-down direction, and a partition member (6) is arranged between two adjacent explosive bags (5) for partition;
step 5: the explosive charges (5) are electrically connected with an exploder, the exploder controls the explosive charges (5) in each medium-length hole (3) to explode at intervals sequentially from bottom to top, and the explosion interval time of two adjacent explosive charges (5) in the same medium-length hole (3) is 10-50 milliseconds;
the medium-length holes (3) are divided into a plurality of rows, each row is provided with at least two medium-length holes (3), and the plurality of medium-length holes (3) are arranged around the periphery of the guide hole (2);
eighteen medium-length holes (3) are arranged, a plurality of the medium-length holes (3) are divided into five rows, two of the three rows are arranged, four of the rest rows are arranged, and the guide holes (2) are positioned between the two medium-length holes (3) of the third row;
the medium-deep holes (3) in the second row, the third row and the fourth row are first medium-deep hole groups, the medium-deep holes (3) in the first row and the fifth row are second medium-deep hole groups, wherein the detonation time of the explosive charges (5) at the lowest end in each medium-deep hole (3) in the first medium-deep hole group is the same, the detonation time of the explosive charges at the lowest end in each medium-deep hole (3) in the second medium-deep hole group is the same, and the detonation time of the explosive charges (5) at the lowest end in each medium-deep hole (3) in the second medium-deep hole group is 10-50 milliseconds later than the detonation time of the explosive charges (5) at the lowest end in each medium-deep hole (3) in the first medium-deep hole group.
2. The reverse well drilling machine-medium deep hole differential blasting collaborative one-time grooving method according to claim 1, wherein the compressive capacity of the concrete foundation (12) in the step 1 is more than or equal to 240T, and the tensile capacity is more than or equal to 30T.
3. The reverse well drilling machine-medium deep hole differential blasting collaborative primary grooving method according to claim 1, wherein the aperture of the guide hole (2) is 1200-1800mm.
4. The reverse well drilling machine-medium deep hole differential blasting collaborative one-time grooving method according to claim 1, wherein the aperture d of the medium deep hole (3) is 90-123mm, the density coefficient is 0.8-1.1, and the minimum resistance line is 23-40d.
5. The reverse well drilling machine-medium deep hole differential blasting collaborative primary grooving method according to claim 1, characterized in that the length of the partition member located below in each medium deep hole (3) in the step 4 is 0.5-0.6m, and the length of the partition member (4) located above is 1.5-1.6m.
6. The reverse well drilling machine-medium deep hole differential blasting collaborative primary grooving method according to claim 1, characterized in that the partition (4) is a sand bag.
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| WO2016205935A1 (en) * | 2015-06-22 | 2016-12-29 | Norvent Mine Systems Inc. | Controlled directional blasting |
| CN106761757A (en) * | 2016-12-07 | 2017-05-31 | 江西理工大学 | A kind of full stage combination chisel it is quick-fried fall the efficient mining methods of ore deposit |
| CN108132005A (en) * | 2017-12-07 | 2018-06-08 | 长春黄金研究院 | A kind of method of short-delay blasting in medium-length hole upward hole |
| CN109539915A (en) * | 2018-12-27 | 2019-03-29 | 攀钢集团工程技术有限公司 | Slot raise blasting construction method |
| CN111005720A (en) * | 2019-11-22 | 2020-04-14 | 铜陵有色金属集团股份有限公司 | Mining method for combined application of multiple apertures of medium-thickness ore body inclined to gentle dip |
| CN112031771A (en) * | 2020-09-18 | 2020-12-04 | 玉溪矿业有限公司 | Groove cutting and pulling method for safe construction |
| CN112796758A (en) * | 2021-01-15 | 2021-05-14 | 贵州化工建设有限责任公司 | High-segmentation non-cutting raise broaching and medium-length hole stage open stoping subsequent filling mining method |
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