CN-121994092-A - Segmented plugging blasting method for uplink drilling

CN121994092ACN 121994092 ACN121994092 ACN 121994092ACN-121994092-A

Abstract

The invention provides a sectional plugging blasting method for an uplink borehole, which comprises the steps of carrying out blasting engineering design according to engineering geological conditions and blasting effect requirements, determining borehole parameters, detonation time sequence and plugging requirements, selecting a charging structure with matched specifications according to the borehole parameters, assembling the charging structure filled with explosive outside the borehole according to the design interval, pushing the borehole, and plugging an orifice. And filling the space between the charging structure and the wall of the drilling hole with quick-setting slurry, and discharging the gas in the drilling hole through the exhaust pipe. And after the slurry in the hole is solidified, the final connection of the detonation network is completed in a safe area outside the hole, and after comprehensive inspection and warning are set, the network is excited by the command of the detonation station to realize detonation. The sectional plugging blasting method for the uplink drilling shortens the length of hole sealing, optimizes the axial distribution of blasting energy, effectively enhances the energy effect of an orifice area and reduces the large block rate.

Inventors

Ao Liangkai
WU YONGZHENG
LI JUNCHEN
HE SIFENG
Zu Guoli
ZHANG HENG

Assignees

中煤科工开采研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20260213

Claims (10)

1. A segmented plugging blasting method for up-hole drilling, comprising: According to engineering geological conditions and blasting effect requirements, blasting engineering design is carried out, and drilling parameters, detonation time sequence and blocking requirements are determined; According to drilling parameters, a charging structure with matched specifications is selected, the charging structure comprises an expansion section, a shrinkage connecting section and an exhaust pipe, the expansion section is connected with the shrinkage connecting section, the expansion section is used for loading explosive, the peripheral wall of the expansion section is provided with a barb structure, the shrinkage connecting section is used for loading a lead wire for connecting the explosive, the expansion section and the shrinkage connecting section are multiple, in the extending direction of the drilling, the expansion section and the shrinkage connecting section are sequentially and alternately arranged, the first end of the exhaust pipe penetrates through the charging structure and is adjacent to the bottom wall of the drilling, and the second end of the exhaust pipe is positioned at the outer side of the drilling; The explosive loading structure filled with the explosive is pushed into the drill hole according to the designed interval after the assembly outside the drill hole is completed; plugging the orifice; Filling quick-setting slurry into a space between the charging structure and the wall of the drilling hole, and discharging gas in the drilling hole through the exhaust pipe; And after the slurry in the hole is solidified, the final connection of the detonation network is completed in a safe area outside the hole, and after comprehensive inspection and warning are set, the network is excited by the command of the detonation station to realize detonation.
2. The segmented plug blasting method for up-stream drilling of claim 1, wherein the radial dimension of the enlarged segment is greater than the radial dimension of the constricted connecting segment and less than the radial dimension of the borehole.
3. The segmented plug blasting method for up-hole drilling of claim 2, wherein selecting a specification-matched charge structure comprises the steps of: According to the radial uncoupling coefficient I.e. , wherein, For the diameter of the borehole, And calculating the charging diameter for the charging diameter, wherein the inner diameter of the expansion section is larger than or equal to the charging diameter.
4. A segmented plug blasting method for up-hole drilling according to claim 3, wherein in the direction of extension of the drill hole, both ends of the charge structure are provided as enlarged segments.
5. The segmented plug blasting method for up-hole drilling of claim 4, further comprising the steps of: According to the axial decoupling coefficient I.e. , wherein, To sum the length of the charge in the borehole, The length of the expansion section and the length of the contraction connection section satisfy the relation of the sum of the lengths between two adjacent explosive loading points , wherein, In order to expand the length of the segment, To shrink the length of the connecting section, and 。
6. The segmented plug blasting method for up-hole drilling of claim 5, wherein the enlarged segment is detachably connected to the contracted connecting segment.
7. The segmented plugging blasting method for up-stream drilling according to claim 5, wherein the expansion segment comprises a first connecting segment, an extension segment and a second connecting segment connected in sequence, the first connecting segment and the second connecting segment are respectively connected with the shrinkage connecting segment, and at least one of the first connecting segment and the second connecting segment is detachably connected with the extension segment.
8. The segmented plugging blasting method for up-hole drilling according to claim 1, wherein the barb structure comprises a barb body and an elastic member, a first end of the barb body is connected with the enlarged section, a second end of the barb body extends toward the hole opening of the hole drilling, a first end of the elastic member is connected with the enlarged section, and a second end of the elastic member is connected with the barb body so that an angle is formed between an extending direction of the barb body and a human axis of the hole drilling.
9. The segmented plug blasting method for up-hole drilling according to claim 1, wherein in plugging the hole, comprising the steps of: and plugging the hole of the drilled hole by adopting a bag belt, wherein the second end of the exhaust pipe penetrates through the bag belt, and the bag belt is provided with a grouting port for conveying quick setting slurry into the bag belt so as to plug the hole of the drilled hole.
10. The segmented plug blasting method for up-stream drilling of claim 9, wherein the bladder is annular in shape and the second end of the exhaust tube extends from a central portion of the bladder, the length of the bladder being less than one third of the length of the drill.

Description

Segmented plugging blasting method for uplink drilling Technical Field The invention belongs to the technical field of rock blasting engineering, and particularly relates to a segmented blocking blasting method for uplink drilling. Background In underground mine room-pillar mining, mine-leaving mining and tunnel engineering, a large number of upward sector-shaped holes or vertical upward holes are often required to be constructed. Because the gravity direction is opposite to the charging direction, the cartridge in the hole is very easy to slide along the hole wall under the action of dead weight or vibration, so that the charging structure is damaged and even the accident of falling the cartridge occurs. In the related art, the construction efficiency is extremely low and the positioning is inaccurate due to the fact that the construction efficiency is usually fixed by means of bamboo chips, wooden wedges or friction force of stemming. In order to prevent explosive from sliding off and explosive gas from rushing out, a long non-charging section is reserved in an orifice for multiple filling and fixing. This results in the aperture area (typically near the free surface) lacking sufficient blast energy coverage, which is highly prone to large pieces of rock (root or chunk), adding to the cost and safety hazards of subsequent secondary fracturing. In addition, it is difficult to fill the ascending holes with loose particles (e.g., sand) like the descending holes to achieve a coupled charge. A large air annular gap is usually formed between the explosive roll and the hole wall, so that explosion shock waves are seriously attenuated in the air and cannot be efficiently transmitted to the rock mass. Disclosure of Invention The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides a sectional plugging blasting method for uplink drilling, which shortens the length of hole sealing, optimizes the axial distribution of blasting energy, effectively enhances the energy effect of an orifice area and reduces the large block rate. The embodiment of the invention discloses a segmented plugging blasting method for uplink drilling, which comprises the following steps: According to engineering geological conditions and blasting effect requirements, blasting engineering design is carried out, and drilling parameters, detonation time sequence and blocking requirements are determined; According to drilling parameters, a charging structure with matched specifications is selected, the charging structure comprises an expansion section, a shrinkage connecting section and an exhaust pipe, the expansion section is connected with the shrinkage connecting section, the expansion section is used for loading explosive, the peripheral wall of the expansion section is provided with a barb structure, the shrinkage connecting section is used for loading a lead wire for connecting the explosive, the expansion section and the shrinkage connecting section are multiple, in the extending direction of the drilling, the expansion section and the shrinkage connecting section are sequentially and alternately arranged, the first end of the exhaust pipe penetrates through the charging structure and is adjacent to the bottom wall of the drilling, and the second end of the exhaust pipe is positioned at the outer side of the drilling; The explosive loading structure filled with the explosive is pushed into the drill hole according to the designed interval after the assembly outside the drill hole is completed; plugging the orifice; Filling quick-setting slurry into a space between the charging structure and the wall of the drilling hole, and discharging gas in the drilling hole through the exhaust pipe; And after the slurry in the hole is solidified, the final connection of the detonation network is completed in a safe area outside the hole, and after comprehensive inspection and warning are set, the network is excited by the command of the detonation station to realize detonation. According to the sectional plugging blasting method for the uplink drilling, disclosed by the embodiment of the invention, the falling of the charging structure can be prevented by utilizing the barb structure after the charging structure is placed into the drilling, and then plugging is carried out, so that the charging structure and the grouting space are completely sealed in the hole, and the technical problems of slurry backflow and hole sealing difficulty during the grouting of the uplink hole are solved. And the slurry is introduced into the drilled hole after hole sealing, and air in the hole is extruded out of the hole through a preset exhaust pipe along with the rising of the liquid level of the slurry, so that air stagnation is prevented. In some embodiments, the radial dimension of the enlarged section is greater than the radial dimension of the contracted connecting