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Cutholing blasting method for optimizing number of blast holes in rock roadway tunneling

A technology of blasting holes and quantity is applied in the field of undercutting and blasting to optimize the number of blasting holes in rock roadway excavation.

Pending Publication Date: 2022-07-15
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Domestic drilling and blasting methods mostly use hand-held hammers to drill holes, and the low efficiency greatly reduces the speed of rock roadway excavation

Method used

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  • Cutholing blasting method for optimizing number of blast holes in rock roadway tunneling
  • Cutholing blasting method for optimizing number of blast holes in rock roadway tunneling
  • Cutholing blasting method for optimizing number of blast holes in rock roadway tunneling

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Embodiment 1

[0031] The traditional ordinary wedge-shaped undercut blasting only arranges undercut holes in the area below the gang. After the groove cavity is formed, a free surface is formed for other blast holes to be detonated. At the same time, the number of blast holes is generally not less than 5 times the cross-sectional area. The reason for this arrangement is that the coal mine can only design 5 blasting sections for ordinary electric detonators. The new digital electronic detonator is not subject to this restriction, and theoretically it can have a total of 1000 segments from 0ms to 999ms to choose from. Therefore, in the actual excavation of rock tunnels, the advantages of digital electronic detonators can be fully utilized to spread the blasting section as far as possible. The shorter interval makes the energy fields generated during the blasting of the blastholes interact with each other, improving the energy utilization rate of the explosives, so that fewer explosives and bl...

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Abstract

The invention discloses a cut blasting method for optimizing the number of blast holes in rock roadway tunneling, and relates to the technical field of drilling blasting, which comprises the following steps: step 1, cut hole arrangement: dividing a tunneling section into an upper cut area and a lower cut area, arranging a plurality of symmetrical upper cut holes in the upper cut area, and arranging a plurality of lower cut holes in the lower cut area; three auxiliary slotting holes arranged in an equilateral triangle structure and three lower slotting holes arranged in an equilateral triangle structure are formed in the lower slotting area, a virtual circle where the auxiliary slotting holes are located and a virtual circle where the lower slotting holes are located are concentrically arranged, and an empty hole is formed in the circle center position; secondly, blasting is conducted, specifically, the lower slotting hole is detonated firstly, then the auxiliary slotting hole is detonated, and then the upper slotting hole is detonated; and finally, the auxiliary hole, the peripheral hole and the bottom hole of the coil are detonated in sequence. According to the method, two slotting blasting areas are designed on one tunneling section, and the overall punching number can be reduced by utilizing the advantages of the electronic digital detonators.

Description

technical field [0001] The invention relates to the technical field of drilling and blasting, in particular to an undercut blasting method for optimizing the number of blast holes in rock roadway excavation. Background technique [0002] Drilling and blasting method is one of the main construction methods for rock wells and roadways. Because of its simple operation and strong applicability, it currently accounts for more than 95% of rock wells and roadways. However, in practical engineering applications, compared with other excavation methods, drill-and-blast excavation can only maintain a low level of 70m / month. The low driving speed of wells has become a bottleneck restricting the efficient exploitation of mine resources. Therefore, it is of great significance to realize the high-efficiency excavation of rock shaft and roadway blasting for alleviating the tension and contradiction of mining, shortening the mine construction period and improving economic benefits. [0003...

Claims

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Application Information

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IPC IPC(8): F42D1/00F42D3/04
CPCF42D1/00F42D3/04
Inventor 杨仁树王雁冰鲍舟琦李成孝张航
Owner UNIV OF SCI & TECH BEIJING
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