CN110030889B - Method for forming well by deep hole partition triangular net cut through one-time blasting - Google Patents
Method for forming well by deep hole partition triangular net cut through one-time blasting Download PDFInfo
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- CN110030889B CN110030889B CN201910306775.4A CN201910306775A CN110030889B CN 110030889 B CN110030889 B CN 110030889B CN 201910306775 A CN201910306775 A CN 201910306775A CN 110030889 B CN110030889 B CN 110030889B
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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
- 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 a method for forming a well by deep hole partition triangular net undermining one-time blasting, which researches a key technology of underground vertical shaft blasting excavation, solves the key problem in blasting excavation, provides a new construction method for forming a well by underground vertical shaft one-time blasting excavation-deep hole partition triangular net undermining one-time well, effectively improves the construction efficiency, liberates the productivity, has remarkable economic benefit and social benefit, and is suitable for large-scale popularization and application.
Description
Technical Field
The invention relates to a method for forming a well through one-time blasting, in particular to a method for forming a well through one-time blasting by deep hole partition triangular net undermining.
Background
As is known, there are two main methods of conventional shaft construction, i.e., a down-going construction method and an up-going construction method. The downward construction method comprises the steps of drilling, blasting, smoke discharging, danger eliminating, slag discharging, finishing, supporting, measuring and the like from top to bottom, and the steps are repeatedly circulated for many times, and gradually and hierarchically excavated downwards until the well is excavated. The construction method is used for excavating the vertical shaft in the broken rock body because the underground working face is narrow, the ventilation is difficult, the lifting is frequent, the working conditions are severe, the working efficiency is low, and underground working personnel can avoid everywhere when falling objects or other dangerous situations occur, so the method belongs to one of the operations with high labor intensity and difficult safety guarantee. Due to the fact that the clamping conditions of the surrounding rock of the well wall are determined, the damage disturbance of the surrounding rock is serious due to the blasting of the tunneling explosive loading amount of the downward construction method, and under the condition that the rock is broken, the well wall is often over-excavated or collapsed, so that a lot of difficulties are brought to follow-up construction. In addition, repeated blasting disturbance in the circulating excavation cannot neglect the accumulated influence of surrounding rocks of nearby tunnels, and can cause the broken rock mass to further loosen, so that the tunnel supporting structure which is originally under the complex stress action of the surrounding rocks is frosted on snow. The drilling and blasting operation of the construction method is also limited by the age of the supporting concrete in the previous cycle, so that the construction period is prolonged, and the requirement of the progress of shaft construction is difficult to meet.
Another conventional excavation method for a shaft is an ascending construction method, which is a bottom-up excavation construction by means of a suspension tank or a work platform. The construction method has the defects of the descending construction method except that the slag is discharged in the artificial well, and the danger is higher.
The underground shaft construction has a series of problems of high excavation difficulty, large safety risk, long construction period, high production cost and the like, and the problems directly affect the national engineering construction and also puzzle the construction unit all the time.
Disclosure of Invention
In order to overcome the defects in the background technology, the invention provides a method for forming a well by one-time blasting of deep hole partition triangular net undermining, which researches the key technology of blasting excavation of an underground vertical shaft, solves the key problem in blasting excavation, and provides a new construction method for forming a well by one-time blasting excavation of an underground vertical shaft, namely, the one-time well formation by deep hole partition triangular net undermining, thereby effectively improving the construction efficiency, liberating the productivity and having remarkable economic benefit and social benefit.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a method for forming a well by one-time blasting of deep hole partition triangular mesh undermining comprises the following steps:
step one, digging an underground chamber:
firstly, excavating a chamber at the bottom and the top of a shaft to be excavated, and when the top of the shaft to be excavated extends to the earth surface, the chamber does not need to be excavated at the top;
secondly, arranging blast holes and drilling holes:
the step is connected, a deep hole drilling machine is used for drilling holes along the whole section of the vertical shaft in the vertical shaft, all blast holes are constructed in place at one time, triangular mesh undermining crushing holes and empty holes are arranged in a central undermining crushing area of the vertical shaft, caving crushing holes are arranged in a caving crushing area between the central undermining crushing area and the edge of the vertical shaft, and pre-cracking holes are arranged on the digging edge of the vertical shaft;
thirdly, charging in blast holes:
carrying out coupled charging or uncoupled charging on the cut crushing hole and the burst crushing hole, wherein uncoupled charging is adopted for the pre-splitting hole, two precise delay detonating detonators are uniformly arranged in the central position in the blast hole which adopts a coupled charging and uncoupled charging structure, the distance between the two detonators is 800-1200 mm, the blocking length of two ends of the blast hole is 20-25 times the diameter of the blast hole, and when the coupled charging is carried out, the blast hole is filled with explosives which are in close contact with the wall of the blast hole; when the explosive is not charged in a coupling mode, the explosive in the blast hole is not fully charged, and a gap is reserved in the radial direction or the axial direction of the blast hole;
fourthly, setting a blasting network and detonating:
and (3) blasting by adopting a time delay control blasting technology, wherein the blasting sequence of each blast hole is as follows: firstly, detonating pre-splitting holes arranged at the edge of a vertical shaft, forming pre-splitting cracks along the excavation contour line of the vertical shaft, then detonating cut crushing holes of a cut crushing area, crushing rocks of the cut crushing area and forming a cut cavity in the cut crushing area; finally, detonating the caving crushing holes in the caving crushing area, wherein the caving crushing holes in the caving crushing area are detonated orderly one circle or hole by hole according to the sequence from the inner circle to the outer circle;
fifthly, deslagging and well wall supporting:
and (3) connecting the steps, after blasting is finished, blasting slag automatically falls in the shaft, a constructor in a roadway leaves out slag by using a rock loading machine, and along with the gradual falling of the blasting slag, the constructor brushes the wall and sprays an anchor net to support the vertical shaft by means of the slag surface, so that the repeated erection of a demolition operation platform can be avoided, the excessive stress release, the loosening and the collapse of surrounding rock of the shaft wall can be prevented, and the brushing of the wall and the support of the shaft wall can be finished immediately after the blasting slag is loaded and transported.
The arrangement method of blast holes comprises the steps that firstly, the center of a vertical shaft is selected as an undermining crushing area, the undermining crushing holes are arranged in an equilateral triangle arrangement mode, the center of the equilateral triangle is provided with a hollow hole, the undermining crushing holes are matched with the hollow hole, after the undermining crushing holes are detonated, a circular cavity with the same height as the vertical shaft is formed in the undermining crushing area, a free surface and an explosive slag containing space are provided for blasting of the caving crushing holes, the edge from the outside of the undermining crushing area to the excavation edge of the vertical shaft is a caving crushing area, the caving crushing area is provided with caving crushing holes, the caving crushing holes are circumferentially arranged between the excavation outline edge of the vertical shaft and a triangular net area formed by the undermining crushing holes, the caving crushing holes collapse and crush rocks in the caving crushing area, and pre-splitting holes are arranged on the excavation outline edge of the vertical shaft, and after the pre-cracking hole is detonated, forming a pre-cracking along the excavation contour line, and separating the rock mass in the excavation region in the shaft contour line from the rock mass outside the contour line.
The diameter of the cutting crushing hole is 75 mm-250 mm, preferably 80 mm-150 mm.
The diameter of the pre-splitting hole is 50-210 mm.
According to the method for forming the well by one-time blasting of the deep hole partition triangular mesh undermining, the diameter of the caving breaking hole is 75-250 mm.
According to the method for forming the well by one-time blasting of the deep hole partition triangular mesh undermining, the time interval of delayed detonation is 10-20 ms.
By adopting the technical scheme, the invention has the following advantages:
the invention researches the key technology of blasting excavation of the underground vertical shaft, solves the key problem in blasting excavation, provides a new construction method for once blasting excavation of the underground vertical shaft, namely a deep hole partition triangular net undermining once well completion, effectively improves the construction efficiency, liberates the productivity, has remarkable economic benefit and social benefit, and is suitable for large-scale popularization and application.
Drawings
FIG. 1 is a schematic illustration of a single shot well of the present invention;
FIG. 2 is a schematic view of the arrangement of blastholes in the present invention;
FIG. 3 is a schematic view of a coupled charge of the present invention;
FIG. 4 is a schematic illustration of an uncoupled charge of the present invention;
Detailed Description
The present invention will be explained in more detail by the following examples, which are not intended to limit the invention;
the method for forming the well by one-time blasting of deep hole partition triangular mesh undermining with reference to the attached drawings 1-4 specifically comprises the following steps:
step one, digging an underground chamber:
as shown in fig. 1, firstly, excavating chambers at the bottom and the top of the shaft to be excavated, and when the top of the shaft to be excavated extends to the earth surface, the chambers do not need to be excavated at the top;
secondly, arranging blast holes and drilling holes:
the step is connected, a deep hole drilling machine is used for drilling holes along the whole section of the vertical shaft in the vertical shaft, all blast holes are constructed in place at one time, triangular mesh undermining crushing holes and empty holes are arranged in a central undermining crushing area of the vertical shaft, caving crushing holes are arranged in a caving crushing area between the central undermining crushing area and the edge of the vertical shaft, and pre-cracking holes are arranged on the digging edge of the vertical shaft; the diameter of the cutting crushing hole is 75 mm-250 mm, preferably 80 mm-150 mm; the diameter of the pre-splitting hole is 50-210 mm; the diameter of the caving and crushing hole is 75-250 mm;
in specific implementation, as shown in fig. 2, the arrangement method of the blast holes includes that the center of the vertical shaft is selected as an undercut crushing area, the undercut crushing holes are arranged in an equilateral triangle arrangement mode, the hollow holes are arranged at the centroid positions of the equilateral triangle and matched with the hollow holes, after the undercut crushing holes are detonated, a circular cavity with the same height as the vertical shaft is formed in the undercut crushing area to provide a free surface and an explosive slag containing space for blasting of the collapse crushing holes, the collapse crushing area is arranged outside the undercut crushing area and along the excavation edge of the vertical shaft and is a collapse crushing area, the collapse crushing area is provided with collapse crushing holes, the collapse crushing holes are arranged between the excavation edge line of the vertical shaft and a triangular mesh area formed by the undercut crushing holes in a circumferential mode, the collapse crushing holes crush rocks in the collapse crushing area, and the pre-splitting holes are arranged on the excavation edge line of the vertical shaft, after the pre-cracked holes are detonated, pre-cracks are formed along an excavation contour line, rock masses in an excavation area in a shaft contour line are separated from rock masses outside the contour line, and the like;
thirdly, charging in blast holes:
after the previous step, as shown in figures 3 and 4, carrying out coupled charging or uncoupled charging on the cut crushing holes and the burst crushing holes, carrying out uncoupled charging on the pre-splitting holes, wherein two precise delay detonating detonators are uniformly arranged in the central positions in the holes in the coupled charging and uncoupled charging structures, the distance between the two detonators is 800-1200 mm, the blocking length of two ends of each hole is 20-25 times the diameter of each hole, and when carrying out coupled charging, the holes are filled with explosives which are in close contact with the walls of the holes; when the explosive is not charged in a coupling mode, the explosive in the blast hole is not fully charged, a gap is reserved in the radial direction or the axial direction of the blast hole, and when the blast hole is not fully charged in the radial direction and is continuously charged in the axial direction, the charge is called as radial uncoupled charge; when the blast hole is filled in the radial direction and is not charged continuously in the axial direction, the blast hole is called as axial uncoupled charge; when the blast hole is not filled in the radial direction and is not continuously charged in the axial direction, the blast hole is called as radial and axial non-coupled charge; the non-coupled explosive charges of the cut crushing blast holes, the caving crushing holes and the pre-splitting blast holes can adopt any one of the three non-coupled explosive charge structural forms according to the explosive quantity and the diameter of the blast holes;
fourthly, setting a blasting network and detonating:
and (3) blasting by adopting a time delay control blasting technology, wherein the blasting sequence of each blast hole is as follows: firstly, detonating pre-splitting holes arranged at the edge of a vertical shaft, forming pre-splitting cracks along the excavation contour line of the vertical shaft, then detonating cut crushing holes of a cut crushing area, crushing rocks of the cut crushing area and forming a cut cavity in the cut crushing area; finally, detonating the caving crushing holes in the caving crushing area, wherein the caving crushing holes in the caving crushing area are detonated orderly one circle or hole by hole according to the sequence from the inner circle to the outer circle; the time interval of the delayed detonation is 10-20 ms; the reasonable delay time of the delay control blasting is as follows:
in the formula:
w-line of least resistance, kg/m3；
Theta-top angle of cone and radian of blasting funnel;
Cp-the speed of propagation of the stress wave in the rock, m/s;
b-minimum crack width required to form a new free face by crack propagation, typically zone 0.01 m;
Vs-the speed of crack propagation, about 1 m/s;
the invention adopts the precise time delay control blasting technology to effectively control the energy of the blasting earthquake waves and greatly reduce the blasting vibration. The energy of seismic waves generated by the instantaneous explosive blasting mode is maximum, the energy of seismic waves generated by the millisecond accurate delay row-by-row blasting mode is suddenly reduced to 42% of the energy of seismic waves generated by the instantaneous explosive blasting mode, and the energy of seismic waves generated by the millisecond accurate delay row-by-row blasting mode is smaller to 18% of the energy of seismic waves generated by the instantaneous explosive blasting mode.
The invention increases the number of the initiation sections with millisecond delay, can effectively improve the vibration reduction probability of the blasting seismic waves and obtains good vibration reduction effect.
Therefore, in actual blasting excavation, in order to reduce damage caused by blasting vibration, 10-20 ms is most suitable for delay time interval, the number of the initiation sections is small, the number of the initiation sections is large, and the number of the initiation sections is small.
Fifthly, deslagging and well wall supporting:
and (3) connecting the steps, after blasting is finished, blasting slag automatically falls in the shaft, a constructor in a roadway leaves out slag by using a rock loading machine, and along with the gradual falling of the blasting slag, the constructor brushes the wall and sprays an anchor net to support the vertical shaft by means of the slag surface, so that the repeated erection of a demolition operation platform can be avoided, the excessive stress release, the loosening and the collapse of surrounding rock of the shaft wall can be prevented, and the brushing of the wall and the support of the shaft wall can be finished immediately after the blasting slag is loaded and transported.
In the specific implementation of the invention, the rock blasting sequence is as follows:
(1) the method comprises the steps of firstly detonating a pre-splitting blast hole arranged on the edge of a vertical shaft, blasting a pre-split along a to-be-excavated side line, wherein the pre-split can effectively cut off the damage of stress waves generated during blasting of other explosive packages to surrounding rocks due to the existence of the pre-split.
(2) Then the rock in the cutting and crushing area in the center of the shaft is blasted, and a cavity with the same height as that of the shaft is formed in the cutting and crushing area. The cut crushing area is provided with cut crushing holes and empty holes. In the construction process of the new construction method for forming the well by one-time blasting of the deep hole partition triangular mesh undermining, blasting of an undermining crushing area is the most critical, in the area, the explosive loading of undermining crushing holes is large, empty holes can provide sufficient compensation space and free blasting surface, after the undermining crushing holes are detonated, rocks in the undermining crushing area are crushed, crushed rock residues can be thrown out under the action of self gravity and detonation gas, a cavity with the same height as a vertical shaft is formed, and the cavity provides free surface and rock crushing space for the subsequent blasting of collapse crushing holes;
(3) and finally, blasting the rocks in the caving and crushing area. The collapse crushing area is an annular area from a side line of the cut crushing area to a side line of the shaft to be excavated. And arranging the caving crushing holes in the caving crushing area, wherein the caving crushing holes are arranged in a circular ring shape around the cut crushing area, and the caving crushing holes are blasted one by one according to the sequence from the inner ring to the outer ring until the blasting of the whole vertical shaft is finished, and the blasted rock fragments slide to the bottom of the shaft. The rock in the caving and crushing area is blasted circle by circle according to the sequence from the inner circle to the outer circle, and the sequence is as follows: circle 1 (first → circle 2 (second → third), as shown in fig. 1.
Through the implementation of the invention, the key technical problems in six aspects in the construction process of once blasting, excavating and well-forming of the underground vertical shaft are effectively solved:
1. through studying traditional undercutting theory and undercutting mode, the thought of deep hole crushing undercutting is proposed to the new undercutting mode of triangular net blasting undercutting has been proposed for the first time, has solved the difficult problem of undercutting blasting in the once blasting excavation well-forming technique of underground shaft.
2. Through C-J detonation theory, rock shock wave, stress wave propagation theory and Mises criterion research, the law of forming the distance between a continuous crushing belt and a blast hole and the distance between blast hole charging by blasting under the condition of adjacent deep hole columnar charging is obtained, the maximum blast hole distance formula of forming the continuous crushing belt under the condition of adjacent deep hole coupled charging and non-coupled columnar charging in unconfined rock is provided, and the key technical problems of the charging amount and the arrangement mode of the cut crushing holes in shaft excavation in a new construction method are solved.
3. Through C-J detonation theory, rock shock wave, stress wave propagation theory and Mises criterion research, the rule of forming a through fracture zone and a blast hole distance by blasting under the condition of adjacent deep hole columnar charging and the rule of charging of the blast hole are obtained, the maximum blast hole distance formula of forming the through fracture zone under the condition of adjacent deep hole non-coupled columnar charging in infinite rock is provided, and the key technical problem of pre-fracture hole charging amount and arrangement distance in shaft excavation in the new construction method is solved.
4. Through the Rivenston theory research, the rule of the charging amount and the arrangement distance of the caving broken holes and the caving rock mass is obtained, the calculation formula of the charging amount and the arrangement distance of the caving broken holes is provided, and the key technical problem of the arrangement of the caving broken holes in the shaft excavation in the new construction method is solved.
5. The method is researched aiming at the formation mechanism of the secondary diagenesis, the relation between the secondary diagenesis and the void fraction is obtained, a calculation formula for avoiding generating a secondary diagenesis compensation space is provided, and the key problem of deep hole blasting secondary diagenesis is solved.
6. The method is researched aiming at the deep-hole columnar charging accurate time-delay controlled blasting, provides measures for reducing blasting vibration and improving blasting effect, provides a reasonable delay time selection formula, solves the key technical problem of the accurate time-delay controlled blasting, and provides theoretical support for the deep-hole columnar charging accurate time-delay controlled blasting necessary for realizing the one-time blasting well-forming technology.
The invention has the following advantages:
the deep hole partition triangular mesh cut primary blasting well forming technology applies a controlled blasting technology, only one time of detonation is needed, the whole vertical well is blasted in sequence according to a pre-designed sequence, and the primary blasting is successful.
The deep hole partition triangular mesh cut-out one-time blasting well forming technology is simple in construction, and the whole vertical shaft can be constructed by only one working cycle. The new construction method adopts a deep hole drilling machine to construct all blast holes in place at one time, namely, all the blast holes are drilled at one time, and the depth of each blast hole is equal to the height of a vertical shaft; the blasting slag automatically falls in the well so as to replace the slag loading operation in the artificial well by a rock loading machine in a roadway; along with the gradual falling of the blasting slag, personnel can brush the wall and support the anchor-spraying net by the slag surface, so that the repeated erection and dismantling of the operation platform can be avoided.
The deep hole partition triangular mesh cut primary blasting well forming technology is characterized in that ordered blasting of each partition rock body in a shaft is realized through in-hole delay or hole extension, continuous or discontinuous charging is carried out in each blast hole, stemming and blocking separation are not needed in the middle, each blast hole is only initiated by two detonators, and the charging structure is simple; each hole is blasted once, and the probability of sympathetic explosion and dummy cannon is very small.
The deep hole partition triangular net cut primary blasting well forming technology avoids the damage of surrounding rocks of a well wall due to multiple blasting disturbances; after explosion, the explosion slag is left in the well to be used as a temporary support body, so that the wall rock of the well wall is prevented from loosening and collapsing; and the excessive stress release, the loose expansion and the collapse of the wall surrounding rock can be prevented.
In a word, the deep hole subregion triangulation network undercutting once explodes the well-forming technique and has overcome the not enough of traditional shaft blasting construction technique, has the advantage, has wide application prospect.
The present invention is not described in detail in the prior art.
The embodiments selected for the purpose of disclosing the invention, are presently considered to be suitable, it being understood, however, that the invention is intended to cover all variations and modifications of the embodiments which fall within the spirit and scope of the invention.
Claims (7)
1. A method for forming a well by one-time blasting of deep hole partition triangular mesh undermining is characterized by comprising the following steps: the method specifically comprises the following steps:
step one, digging an underground chamber:
firstly, excavating a chamber at the bottom and the top of a shaft to be excavated, and when the top of the shaft to be excavated extends to the earth surface, the chamber does not need to be excavated at the top;
secondly, arranging blast holes and drilling holes:
the step is connected, a deep hole drilling machine is used for drilling holes along the whole section of the vertical shaft in the vertical shaft, all blast holes are constructed in place at one time, triangular mesh undermining crushing holes and empty holes are arranged in a central undermining crushing area of the vertical shaft, caving crushing holes are arranged in a caving crushing area between the central undermining crushing area and the edge of the vertical shaft, and pre-cracking holes are arranged on the digging edge of the vertical shaft;
thirdly, charging in blast holes:
carrying out coupled charging or uncoupled charging on the cut crushing hole and the burst crushing hole, wherein uncoupled charging is adopted for the pre-splitting hole, two precise delay detonating detonators are uniformly arranged in the central position in the blast hole which adopts a coupled charging and uncoupled charging structure, the distance between the two detonators is 800-1200 mm, the blocking length of two ends of the blast hole is 20-25 times the diameter of the blast hole, and when the coupled charging is carried out, the blast hole is filled with explosives which are in close contact with the wall of the blast hole; when the explosive is not charged in a coupling mode, the explosive in the blast hole is not fully charged, and a gap is reserved in the radial direction or the axial direction of the blast hole;
fourthly, setting a blasting network and detonating:
and (3) blasting by adopting a time delay control blasting technology, wherein the blasting sequence of each blast hole is as follows: firstly, detonating pre-splitting holes arranged at the edge of a vertical shaft, forming pre-splitting cracks along the excavation contour line of the vertical shaft, then detonating cut crushing holes of a cut crushing area, crushing rocks of the cut crushing area and forming a cut cavity in the cut crushing area; finally, detonating the caving crushing holes in the caving crushing area, wherein the caving crushing holes in the caving crushing area are detonated orderly one circle or hole by hole according to the sequence from the inner circle to the outer circle;
fifthly, deslagging and well wall supporting:
and (3) connecting the steps, after blasting is finished, blasting slag automatically falls in the shaft, a constructor in a roadway leaves out slag by using a rock loading machine, and along with the gradual falling of the blasting slag, the constructor brushes the wall and sprays an anchor net to support the vertical shaft by means of the slag surface, so that the repeated erection of a demolition operation platform can be avoided, the excessive stress release, the loosening and the collapse of surrounding rock of the shaft wall can be prevented, and the brushing of the wall and the support of the shaft wall can be finished immediately after the blasting slag is loaded and transported.
2. The method for forming the well by one-time blasting of the deep hole partition triangular mesh cut according to claim 1, which is characterized in that: the arrangement method of the blast holes comprises the steps that firstly, the center of a vertical shaft is selected as an undermining crushing area, the undermining crushing holes are arranged in an equilateral triangle arrangement mode, hollow holes are arranged at the centroid positions of the equilateral triangle and are matched with the hollow holes, after the undermining crushing holes are detonated, a circular cavity with the same height as the vertical shaft is formed in the undermining crushing area, a free surface and an explosive slag containing space are provided for blasting of the caving crushing holes, the edge of the vertical shaft from the outside of the undermining crushing area to the excavation edge of the vertical shaft is a caving crushing area, the caving crushing area is provided with the caving crushing holes, the caving crushing holes are centered on the central crushing area and are circumferentially arranged between the excavation outline edge of the vertical shaft and a triangular mesh area formed by the undermining crushing holes, the caving crushing holes crush the rocks in the caving crushing area, the pre-cracking holes are arranged on the excavation outline edge of the vertical shaft, after the pre-cracking holes are detonated, pre-cracks are formed along, and separating the rock mass of the excavation region in the shaft contour line from the rock mass outside the contour line.
3. The method for forming the well by one-time blasting of the deep hole partition triangular mesh cut according to claim 1, which is characterized in that: the diameter of the cutting crushing hole is 75 mm-250 mm.
4. The method for forming the well by one-time blasting of the deep hole partition triangular mesh cut according to claim 1, which is characterized in that: the diameter of the cut crushing hole is 80 mm-150 mm.
5. The method for forming the well by one-time blasting of the deep hole partition triangular mesh cut according to claim 1, which is characterized in that: the diameter of the pre-splitting hole is 50 mm-210 mm.
6. The method for forming the well by one-time blasting of the deep hole partition triangular mesh cut according to claim 1, which is characterized in that: the diameter of the collapse and crushing hole is 75-250 mm.
7. The method for forming the well by one-time blasting of the deep hole partition triangular mesh cut according to claim 1, which is characterized in that: the time interval of the delayed detonation is 10-20 ms.
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| CN111156019B (en) * | 2019-12-26 | 2021-07-27 | 临沂会宝岭铁矿有限公司 | Drilling device for blasting and inclined drop shaft one-step forming segmented blasting method |
| CN111521082A (en) * | 2020-04-08 | 2020-08-11 | 西部矿业股份有限公司 | One-time well completion method by matching high-pass shaft and medium-length hole sectional blasting in raise-boring construction |
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| CN104594903A (en) * | 2014-11-19 | 2015-05-06 | 攀钢集团工程技术有限公司 | Ore breaking method for whole-section high combination rock drilling blasting |
| CN107131806A (en) * | 2017-05-09 | 2017-09-05 | 深圳市中金岭南有色金属股份有限公司 | Service shaft is disposable into well blasting method |
| 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 |
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