CN113188388A - In-hole delay sectional detonating cut structure and method - Google Patents
In-hole delay sectional detonating cut structure and method Download PDFInfo
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- CN113188388A CN113188388A CN202110557985.8A CN202110557985A CN113188388A CN 113188388 A CN113188388 A CN 113188388A CN 202110557985 A CN202110557985 A CN 202110557985A CN 113188388 A CN113188388 A CN 113188388A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/04—Particular applications of blasting techniques for rock blasting
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Abstract
The invention relates to the technical field of tunneling, in particular to a structure and a method for in-hole delay sectional detonation cut, which comprises the following steps: a center hole provided on the heading face; the explosive loading holes are arranged on the tunneling operation surface and distributed on the periphery of the center hole; the explosive charging device comprises a charging hole, a blocking section and an explosive charging section, wherein the blocking section and the explosive charging section are arranged in the charging hole at intervals, the explosive charging sections are arranged from outside to inside at intervals for detonation, and the bottom of the blocking section is provided with a throwing explosive charging section for blasting and throwing broken stones after explosive explosion in the explosive charging hole; by means of alternate and segmented initiation in the hole, when the stress wave transmitted from the front-end explosive to the rear-section explosive is not completely eliminated, the rear-section explosive is initiated to enable the exploded rock body to receive bidirectional stress, so that the crushing effect is improved, and the interaction between broken stones is also increased; when delay blasting is adopted, the shock waves generated by blasting can interfere with each other and weaken, so that the shock effect on the surrounding environment is reduced, and the safe development of blasting operation is facilitated.
Description
Technical Field
The invention relates to the technical field of tunneling, in particular to a structure and a method for in-hole delay sectional blasting and cutting.
Background
The cut blasting is the first process of tunnel driving engineering, and its main action is to blast a new free surface to create favorable blasting conditions for other blast holes, and its blasting effect affects the blasting effect of full-section and the utilization rate of blast holes, and the cut quality determines the depth of single circulation advance.
In the prior art, a micro-differential initiation technology is generally used for carrying out among different holes, and a new free surface is formed around the adjacent holes, for example, the technical scheme provided by patent document 1, although sequential micro-differential initiation is adopted in the cut hole holes, the clamping effect of rocks is overcome, and the circulating depth of advance is improved; but the time interval among the prior art is fixed, only is adapted to the colliery in north Anhui dialect area, and when using different rock hardness, because the rock is torn and the disintegration time of blasting is different, and charge volume and blasting interval time can not be confirmed, then can't reach good undercutting effect, in addition, its technical scheme rock mass piles up easily when the undercutting, is unfavorable for the follow-up face that enlarges of whole operation face.
Prior art documents:
patent document 1: CN111256549A rock drift deep-hole multi-wedge straight-hole internal-segment differential undermining blasting method
Disclosure of Invention
The invention aims to provide a structure and a method for delayed subsection blasting cut in a hole, which utilize the blasting interval of each section to lead a rock body to have certain damage in the detonation action of explosive at the front end, form a crack with certain width and an additional free surface and provide a new blasting free surface for the explosive loaded at the rear section.
Preferably, in order to achieve the above object, the present invention provides an in-hole delayed staged blasting cut structure, including:
a center hole provided on the heading face;
the explosive loading holes are arranged on the tunneling operation surface and distributed on the periphery of the center hole;
the explosive charging device comprises a charging hole, a blocking section and a charging section, wherein the blocking section and the charging section are arranged in the charging hole at intervals, the charging section is arranged to be detonated at intervals from outside to inside, and a throwing charging section is arranged at the bottom of the blocking section and is used for blasting and throwing broken stones after explosive explosion in the charging hole.
Preferably, the diameter of the central hole is 100mm, the diameter of the medicine loading hole is 45mm, and the distance between the central hole and the medicine loading hole satisfies 1.5-1.7 times of the diameter of the central hole.
Preferably, the charging holes are arranged in four rhombus-shaped distribution, and the central hole is positioned in the center of the four charging holes.
Preferably, the charging hole is internally provided with a plugging section and a charging section which are distributed from the hole opening inwards at intervals.
The invention provides another technical scheme, and the cutting method of the in-hole delay sectional initiation cutting structure comprises the following steps:
step S1, drilling a center hole and four loading holes on the tunneling working face;
step S2, sequentially filling explosives and plugs in the explosive filling holes to ensure that the explosives are distributed at intervals;
and step S3, sequentially detonating the explosives in the explosive loading holes from outside to inside by using electronic detonators according to a preset time interval.
Preferably, the interval initiation time of the adjacent charge segments in the same charge hole
Wherein, td＝kh1；
In the formula, tdIs the time when the chassis rock mass starts to move, k is a constant related to lithology, cartridge diameter and cartridge resistance line, and in strongly altered phyllite and granite spanite with a rock hardness coefficient f of 10-12, k is 3.2ms/m, h1Is the resistance line of the cartridge chassis, S is the crack width required for the formation of a new free surface, which marks that the explosive body has been detached from the rock mass, and is defined as S10 mm, vcIs the average crack opening speed, v is the rock hardness coefficient f is 10-12 in the ore rockc＝3.3-3.4m/s。
Preferably, the bottom of the central hole is filled with explosive, an electronic detonator is used for initiation, and the initiation time of the electronic detonator is set to be later than that of the explosive in the explosive filling hole.
Preferably, the medicine loading quantity Q in the medicine loading hole is Q a h, wherein Q is 0.5-1.0 kg/m3The distance between two medicine charging holes distributed around the central hole is a, the distance between two medicine charging holes distributed around the central hole is b, and the depth of each medicine charging hole is h.
Preferably, four charging holes distributed around the center hole in sequence are defined as a charging hole A, a charging hole B, a charging hole C and a charging hole D, and a charging section in the charging hole A is defined as A from outside to inside1、A2···ANThe charging section in the charging hole B is defined as B from outside to inside1、B2···BNThe charging section in the charging hole C is defined as C from outside to inside1、C2···CNThe charging section in the charging hole D is defined as D from outside to inside1、D2···DNThe sequence in which the explosive is detonated is: a. the1、B1、C1、D1Simultaneous initiation, spaced by a predetermined time, A2、B2、C2、D2Initiating simultaneously,. cndot. at predetermined intervals, AN、BN、CN、DNAnd simultaneously detonating.
Preferably, the length of each section of explosive in the charging hole and the length of the plug are both 400 mm.
The invention has the advantages that:
because the rock is torn after blasting and can form the face of vacancy by separating from the rock mass for a certain distance, the invention provides a calculation formula of interval initiation time suitable for different rocks according to different rock hardness characteristics, sets corresponding charge amount and charge length, and can detonate at the rear section after the rock is separated to form a new face of vacancy after the initiation at the front section, thus deeper undercut depth can be achieved under rock strata with different hardness;
meanwhile, the bidirectional stress effect on the rock is large, the rock crushing effect is good, the interaction between broken stones is increased, the degree of fragmentation of the blasted rock body is high, in addition, a section of charging is arranged at the bottom of the central hole, after the blasting of the charging hole, the bottom charging of the center can throw the front section of rock block outwards, the hole cleaning and the field cleaning are facilitated, the workload is reduced, and the safety is improved;
in addition, during delayed blasting, the shock waves generated by blasting can interfere with each other to weaken, so that the shock intensity of the whole blasting is reduced, the method is friendly to the surrounding environment, and the safe development of blasting operation is facilitated.
In order to reduce the resistance of the rock when the explosive charge close to the inside of the hole explodes, change the resistance line of the chassis of the explosive charge, detonate by sections at intervals in the hole, when the stress wave propagated to the rear section of the explosive charge by the front end explosive charge is not completely disappeared, and after the front section explosive charge and the rear section rock are separated by a certain distance, detonate the rear section explosive charge, so that the whole resistance of the rock close to the inside is small, the rock can be broken and moved by the explosive charge explosion energy fully, and the deeper depth of the depth can be reached inwards;
because the front blasting shock wave does not disappear, the blasted rock body is subjected to bidirectional stress, so that the crushing effect is improved, the interaction between the broken stones is also increased, the rock is loosened, the size of the rock block is smaller, and the broken stones cannot jump to a longer distance due to bidirectional stress, so that the broken stones can be conveniently loaded in the later period, and the safety is improved;
in addition, when delay blasting is adopted, the shock waves generated by blasting can interfere with each other and weaken, so that the shock effect on the surrounding environment is reduced, and the safe development of blasting operation is facilitated.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent. In addition, all combinations of claimed subject matter are considered a part of the presently disclosed subject matter.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic structural view of a delayed staged initiation cut structure in a hole of the present invention;
FIG. 2 is a schematic view of the charge configuration of the delayed staged initiation undercut configuration in a hole of the present invention;
FIG. 3 is a schematic view of the formation of a slotted hole in a hole with simultaneous initiation of the plunge cuts;
FIG. 4 is a schematic view of the formation of slotted holes for delayed staged initiation of a plunge cut in a hole;
FIG. 5 is a cloud of detonation damage for simultaneous detonation channeling within a hole;
FIG. 6 is a cloud of detonation damage for a delayed staged detonation plunge cut in a hole.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.
In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be understood that the various concepts and embodiments described above, as well as those described in greater detail below, may be embodied in any of numerous ways in any of the configurations and methods of delayed zone initiation undercutting within a hole, as the disclosed concepts and embodiments are not limited to any embodiment. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.
When the explosive in the hole is detonated, a blasting funnel can be generated, and due to the clamping effect of rocks in the cut blasting, the closer to the inside, the longer the minimum resistance line is, the poorer the blasting effect is, and the single tunneling depth is limited.
Referring to fig. 1 and 2, the embodiment provides an in-hole delayed staged blasting cut structure, which includes a central hole 3 and a charging hole 2, wherein the central hole 3 is arranged on a tunneling working face 1; the loading holes 2 are arranged on the tunneling working face 1 and distributed on the periphery of the center hole 3.
So, the centre bore 3 provides the buffer space when the rock is conquassated around, and after the explosive explosion of charge hole 2 inside, the detonation product began to act on the cliff, and the cliff takes place moulding deformation under the detonation wave effect at first. The detonation product particles are prevented from expanding outwards under the action of strong restraint generated by the rock wall, and the reflection and transmission of stress waves occur at the interface of the detonation product and the rock wall. And finally, under the pushing of detonation products, the pre-explosion rock moves towards the tunneling working face to generate a blasting groove.
Further, the blocking section 21 and the explosive charging section 22 are arranged in the explosive charging hole 2 at intervals, the explosive charging section 22 is arranged to be detonated at intervals from outside to inside, and the bottom of the blocking section 21 is provided with a throwing explosive charging section for blasting and throwing broken stones after explosive explosion in the explosive charging hole.
Therefore, by utilizing the detonation intervals of the sections, the rock body is damaged to a certain extent in the detonation action of the explosive at the front end, a crack with a certain width and an additional free surface are formed, and a new free blasting surface is provided for the rear section charging. The direction of the minimum resistant line of the back-end explosive-charging detonation is changed, so that the blasting width is effectively increased, and the deeper circulating depth of penetration can be achieved.
In order to form a better free surface, after the blasting of the front section of explosive charge, the broken body is separated from the original rock body, a new free surface is formed, but before the residual stress established by the quasi-static pressure of the detonation product of the front section of explosive charge is not disappeared, the rear section of explosive charge is detonated, so that the new free surface generated by the front section of explosive charge can be utilized, in addition, the stress of the front section of explosive charge and the stress of the rear section of explosive charge are superposed to achieve a good blasting effect, and preferably, the interval detonation time of the adjacent explosive charge sections 22 is optimized
Wherein, td＝kh1；
In the formula, tdIs the time when the chassis rock mass starts to move, k is a constant related to lithology, cartridge diameter and cartridge resistance line, and in strongly altered phyllite and granite spanite with a rock hardness coefficient f of 10-12, k is 3.2ms/m, h1Is the resistance line of the cartridge chassis, S is the crack width required for the formation of a new free surface, which marks that the explosive body has been detached from the rock mass, and is defined as S10 mm, vcIs the average crack opening speed, v is the rock hardness coefficient f is 10-12 in the ore rockc3.3-3.4 m/s. In the present embodiment, the interval initiation time is 12 ms.
In iron-containing quartzite with the rock hardness coefficient f of 16-18, k is 2.8ms/m and v iscThe value is 10m/s and the time interval is 10 ms.
k is a constant related to lithology, cartridge diameter and cartridge resistance line, and is generally 2-4 ms/m, and the value of k is determined by observation. v. ofcIs the average crack opening velocity.
In this embodiment, the diameter of the center hole 3 is 100mm, the diameter of the charge hole 2 is 45mm, and the distance between the center hole 3 and the charge hole 2 satisfies 1.5 to 1.7 times the diameter of the center hole 3, and in this embodiment, 1.5 times the diameter of the center hole 3 is 150 mm. The medicine loading holes 2 are arranged in a rhombus shape, and the central hole 3 is positioned at the center of the four medicine loading holes 2.
And evaluating the blasting load borne by each section of charge according to the single-cycle footage, thereby determining the section scheme in the hole. In the embodiment, the footage is 2.4m in a single circulation under three-level surrounding rock, three-section charging is divided in a hole, each section of charging is filled with 0.4m of explosive column length, 0.4m is filled in the hole, a throwing explosive charge is placed at the bottom of a central hole 3, and piled crushed stone generated by blasting of the previous three sections is thrown, wherein the length of the central hole 3 is 2.8 m. The central bore 3 is divided into a projectile charge section 32 and a cavity section 31.
In an alternative embodiment, shown in connection with figure 2, the loading hole 2 is provided with a plugging section 21 and a loading section 22 spaced inwardly from the hole. The explosive is emulsion explosive and adopts a non-coupling explosive charging mode.
In an alternative embodiment, the charge Q in the charge hole 2 is Q a b h, wherein Q is 0.5 to 1.0kg/m3Hard rock and bottom plate holes are large, the blast holes which are initiated first and are close to the cut holes are large, and conversely, the blast holes are small, but the maximum charge of each hole does not exceed the cut holes, and the holes are filled with concentrated charges at the bottoms of the holes, so that the holes are blocked. a is the distance between two medicine-loading holes which are distributed oppositely around the central hole, b is the distance between two medicine-loading holes which are distributed adjacently around the central hole, and h is the depth of the medicine-loading hole 2.
The invention provides another technical scheme, in particular to a method for in-hole delayed sectional detonating and cutting, which utilizes the in-hole delayed sectional detonating and cutting structure of the scheme and comprises the following steps:
drilling a center hole 3 and four loading holes 2 on the tunneling working face 1;
sequentially filling explosives and a plug in the explosive loading hole 2 to ensure that the explosives are distributed at intervals;
and (4) sequentially detonating the explosives in the explosive loading holes from outside to inside by using an electronic detonator according to a preset time interval.
Preferably, the bottom of the central hole 3 is charged with electricityThe sub-detonators are detonated, and the detonation time of the sub-detonators is set to be later than that of the explosives in the explosive charging holes. Intermittent initiation times of adjacent charge segments 22
Wherein, td＝kh1；
In the formula, tdIs the time when the chassis rock mass starts to move, k is a constant related to lithology, cartridge diameter and cartridge resistance line, and in strongly altered phyllite and granite spanite with a rock hardness coefficient f of 10-12, k is 3.2ms/m, h1Is the resistance line of the cartridge chassis, S is the crack width required for the formation of a new free surface, which marks that the explosive body has been detached from the rock mass, and is defined as S10 mm, vcIs the average crack opening speed, v is the rock hardness coefficient f is 10-12 in the ore rockc3.3-3.4 m/s. In the present embodiment, the interval initiation time is 12 ms.
In iron-containing quartzite with the rock hardness coefficient f of 16-18, k is 2.8ms/m and v iscThe value is 10m/s and the time interval is 10 ms.
k is a constant related to lithology, cartridge diameter and cartridge resistance line, and is generally 2-4 ms/m, and the value of k is determined by observation. v. ofcIs the average crack opening velocity.
Therefore, by controlling the initiation time, when the stress wave propagated from the front-end explosive to the rear-section explosive is not completely disappeared, the rear-section explosive is initiated to ensure that the exploded rock body receives bidirectional stress, thereby improving the crushing effect and increasing the interaction between the broken stones.
In a preferred embodiment, four charging holes distributed around the central hole in sequence are defined as a charging hole A, a charging hole B, a charging hole C and a charging hole D, and a charging section in the charging hole A is defined as A from outside to inside1、A2···ANThe charging section in the charging hole B is defined as B from outside to inside1、B2···BNThe charging section in the charging hole C is defined as C from outside to inside1、C2···CNThe charging section in the charging hole D is defined as D from outside to inside1、D2···DNThe sequence in which the explosive is detonated is: a. the1、B1、C1、D1Simultaneous detonation, interval 12ms, A2、B2、C2、D2Simultaneous firing at intervals of 12ms, AN、BN、CN、DNAnd simultaneously detonating.
In an alternative embodiment, a spiral burst mode, i.e. A, may also be used1、B1、C1、D1、A2、B2、C2、D2···AN、BN、CN、DNAnd (3) sequentially detonating, wherein each detonating point is separated by 12 ms.
Referring to fig. 2, the charge in the charge hole a, the charge hole B, the charge hole C and the charge hole D are all three sections. The length of each section of explosive in the charging hole 2 and the length of the plug are both 400 mm.
Referring to fig. 3 and 4, the evolution process of the undercut formation under the simultaneous initiation of the sectional charges (fig. 3) and the delayed initiation (fig. 4) is shown, respectively. As can be seen from figure 4, after the explosive is detonated, the explosion cavity begins to expand, the rock mass on one side close to the empty face begins to move outwards, the outermost layer of the empty face and the blocking section are subjected to oblique tension cracking, dense cracks appear on the rock mass on the empty face and the blocking section along with the continuous expansion of the explosion cavity, the rock mass close to the empty face and the blocking section is thrown out in a block form along with the continuous rapid expansion of the cracks, and the crack distribution with different densities exists in the reserved rock mass.
After each section of explosive column is detonated, product particles bombard the rock wall to form a strong detonation product particle flow, the detonation product particles expand and bombard on the hole wall, and the blast hole wall bears load and starts to generate damage. With the continuous expansion of the detonation products in the cut-out space, the internal particles continue to be pulled apart and move forward as the subsequent supplement of the product particle flow, and the rock mass in the direction of the free surface is further damaged.
Referring to fig. 5 and 6, fig. 5 and 6 show the final cavitation of simultaneous initiation and staged initiation plunge cut blasting, respectively, with the staged initiation plunge cut blasting area increased by 20-30% compared to simultaneous initiation. Therefore, the segmented delay blasting actually plays an obvious cavity expanding role, and the damage of the rock is more concentrated in the cut cavity compared with the simultaneous detonation.
By combining the above embodiment, due to the segmented charging in the hole, the pre-explosion rock body borne by the single-segment explosive column is reduced, the front-end charging can provide a new free surface for the rear-end charging, the clamping effect of the rock in the cut blasting is reduced, and the cut effect is obvious due to the equal-dosage continuous charging blasting. Compared with the delayed initiation of multi-section charging, the delayed initiation of the rear-end charging obviously reduces the maximum throwing speed of the outer rock mass and effectively reduces the throwing distance.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.
Claims (10)
1. The utility model provides an downthehole time delay segmentation detonating undercutting structure which characterized in that includes:
a center hole provided on the heading face;
the explosive loading holes are arranged on the tunneling operation surface and distributed on the periphery of the center hole;
the explosive charging device comprises a charging hole, a blocking section and a charging section, wherein the blocking section and the charging section are arranged in the charging hole at intervals, the charging section is arranged to be detonated at intervals from outside to inside, and a throwing charging section is arranged at the bottom of the blocking section and is used for blasting and throwing broken stones after explosive explosion in the charging hole.
2. The structure of claim 1, wherein the diameter of the central hole is 100mm, the diameter of the charge hole is 45mm, and the distance between the central hole and the charge hole is 1.5-1.7 times the diameter of the central hole.
3. An in-hole delayed segmented initiation plunge cut structure as claimed in claim 1, wherein said charge holes are arranged in four diamond-shaped distributions, said central hole being located in the center of the four charge holes.
4. A delayed staged initiation plunge cut structure in a hole according to claim 1, wherein the charge hole is provided with a plugging section and a charging section which are spaced inwardly from the hole opening.
5. A method for conducting in-hole delayed staged initiation plunge cutting according to any one of claims 1-4, characterized in that: the method comprises the following steps:
step S1, drilling a center hole and four loading holes on the tunneling working face;
step S2, sequentially filling explosives and plugs in the explosive filling holes to ensure that the explosives are distributed at intervals;
and step S3, sequentially detonating the explosives in the explosive loading holes from outside to inside by using electronic detonators according to a preset time interval.
6. A method of delayed staged initiation undercutting from within a hole as claimed in claim 5, wherein the interval initiation time of adjacent charge segments within the same charge hole
Wherein, td＝kh1；
In the formula, tdIs the time when the chassis rock mass starts to move, k is a constant related to lithology, cartridge diameter and cartridge resistance line, and in strongly altered phyllite and granite spanite with a rock hardness coefficient f of 10-12, k is 3.2ms/m, h1Is the resistance line of the cartridge chassis, S is the crack width required for the formation of a new free surface, which marks that the explosive body has been detached from the rock mass, and is defined as S10 mm, vcIs the average crack opening speed, v is the rock hardness coefficient f is 10-12 in the ore rockc＝3.3-3.4m/s。
7. A method for conducting undermining with a delayed staged initiation undermining structure as claimed in claim 6, wherein the bottom of the central hole is charged with explosive and the initiation is conducted using an electronic detonator, the initiation time of which is set to be later than the initiation time of the explosive in the charging hole.
8. A method for conducting delayed staged initiation cut-out structure in a hole according to claim 6, wherein the charge Q in the charge hole is Q a b h, wherein Q is 0.5-1.0 kg/m3The distance between two medicine charging holes distributed around the central hole is a, the distance between two medicine charging holes distributed around the central hole is b, and the depth of each medicine charging hole is h.
9. The method for delayed staged blasting cut in hole as claimed in claim 7 or 8, wherein four charging holes distributed in sequence around the central hole are defined as charging hole A, charging hole B, charging hole C and charging hole D, and the charging section from outside to inside in charging hole A is defined as A1、A2···ANThe charging section in the charging hole B is defined as B from outside to inside1、B2···BNThe charging section in the charging hole C is defined as C from outside to inside1、C2···CNThe charging section in the charging hole D is defined as D from outside to inside1、D2···DNThe sequence in which the explosive is detonated is: a. the1、B1、C1、D1Simultaneous initiation, spaced by a predetermined time, A2、B2、C2、D2Initiating simultaneously,. cndot. at predetermined intervals, AN、BN、CN、DNAnd simultaneously detonating.
10. A method of delayed staged initiation and plunge cutting within a hole according to claim 9, wherein the length of each section of explosive and the length of the plug in the charge hole are both 400 mm.
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| CN202110557985.8A CN113188388A (en) | 2021-05-21 | 2021-05-21 | In-hole delay sectional detonating cut structure and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113686215A (en) * | 2021-09-09 | 2021-11-23 | 昆明理工大学 | Rock roadway large-diameter double-hole charging accurate time-delay hole-by-hole vertical cut blasting method |
| CN115468464A (en) * | 2022-09-08 | 2022-12-13 | 北京科技大学 | Deep metal mine full-section deep hole blasting method based on accurate time delay of electronic detonator |
-
2021
- 2021-05-21 CN CN202110557985.8A patent/CN113188388A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113686215A (en) * | 2021-09-09 | 2021-11-23 | 昆明理工大学 | Rock roadway large-diameter double-hole charging accurate time-delay hole-by-hole vertical cut blasting method |
| CN113686215B (en) * | 2021-09-09 | 2022-06-21 | 昆明理工大学 | Rock roadway large-diameter double-hole charging accurate time-delay hole-by-hole vertical cut blasting method |
| CN115468464A (en) * | 2022-09-08 | 2022-12-13 | 北京科技大学 | Deep metal mine full-section deep hole blasting method based on accurate time delay of electronic detonator |
| CN115468464B (en) * | 2022-09-08 | 2023-11-03 | 北京科技大学 | Deep metal mine full-section deep hole blasting method based on accurate time delay of electronic detonator |
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Application publication date: 20210730 |