One-time blasting method for large section of rock roadway

A one-time, large-section technology, applied in the field of blasting, can solve problems affecting blasting effects, threats to safety production, and slow excavation speed, so as to improve blasting safety, prevent technical throwing of shots, and reduce the size of rock blocks.

Inactive Publication Date: 2011-11-30
安徽恒源煤电股份有限公司钱营孜煤矿
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For coal mine medium-hard rock and large-section tunnels, domestic and foreign mainly adopt the method of shallow holes and serial blasting operations. Due to shallow blastholes and many blasting times, the phenomenon of blind blasting generally does not occur, but this blasting operation method is efficient. Low, slow tunneling speed
If the coal mine has a large cross-section rock roadway and adopts a large-section one-time blasting operation, if the rock encountered is relatively hard and the blastholes are arranged more, even if the 200 blasters allowed in the coal mine are used, the phenomenon of blasting often occurs during the blasting process, which not only affects the blasting effects, waste of materials, and more seriously, a great threat to safe production
[0003] Improper handling of frequently lost guns can easily lead to explosion accidents

Method used

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  • One-time blasting method for large section of rock roadway
  • One-time blasting method for large section of rock roadway
  • One-time blasting method for large section of rock roadway

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] see figure 1 , 2 , when the lithology of the rock roadway in the mine section is 1-5, the lithology is mainly mudstone and explosive rock, the suitable roadway section is 13-15 square meters, the number of detonators used is 90-110, and the type of blasting detonator is selected as iron Detonator, the length of the foot line is 3 meters, and the practical resistance value of the detonator is 4.5-5.5ζ;

[0064] Determine the technological parameter of the blast hole as the drill diameter The depth of the blasting hole is 2.4m, the diameter of the explosive is 27mm, and the length is 400mm or 250mm. The distance between the holes around each blasting hole is 450-550mm, and the distance between the auxiliary holes is 600-700mm. Drilling is carried out;

[0065] According to the type, model and quantity of explosives determined by each blast hole, uncoupled charge is used to fill explosives, 2 rolls per hole for peripheral blast holes, 300g per roll, 3 rolls per hole for...

Embodiment 2

[0070] see figure 1 , 2 , when the lithology of the rock roadway in the mine section is 5-10, the lithology is mainly siltstone, which is relatively difficult to blast, and the suitable roadway section is 16-20 square meters. The length is 3 meters, and the resistance value of the practical detonator is 4.5-5.5ζ;

[0071] The process parameters for determining the blast hole are: peripheral hole and auxiliary hole drilling diameter Cutting hole diameter The depth of the blast hole is 2.4m. The peripheral eye and auxiliary eye use water gel explosives with a diameter of 27mm and a length of 400mm. The cutting hole uses water gel explosives with a diameter of 35mm and a length of 250mm. The spacing is 500-600mm;

[0072] According to the type, model and quantity of explosives determined by each blast hole, uncoupled charge is used to fill explosives, 2 rolls per hole for peripheral blast holes, 300g per roll, 3 rolls per hole for auxiliary blast holes, 250g roll per hole, ...

Embodiment 3

[0077] see figure 1 , 2 , when the lithology of the rock roadway in the mine section is 10-19, the lithology is mainly medium-fine sandstone, which is relatively difficult to blast, and the suitable roadway section is 18-22 square meters. The line length is 3 meters, and the practical detonator resistance value is 2.8-3.3ζ;

[0078] The process parameters for determining the blast hole are: peripheral hole and auxiliary hole drilling diameter Cutting hole diameter The depth of the blast hole is 2.4m. The peripheral eye and auxiliary eye use water gel explosives with a diameter of 27mm and a length of 400mm. The cutting hole uses water gel explosives with a diameter of 35mm and a length of 250mm. The spacing is 400-450mm;

[0079] According to the type, model and quantity of explosives determined by each blast hole, uncoupled charge is used to fill explosives, 2 rolls per hole for peripheral blast holes, 300g per roll, 3 rolls per hole for auxiliary blast holes, 250g roll...

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Abstract

The invention relates to a large-section one-time blasting method of a rock roadway, which is characterized in that: the blasting steps are: (1) selecting the blasting detonator type according to the lithology of the rock roadway in the mine section and the size of the blasting section; (2) determining the blasting method (3) According to the type, model and quantity of explosives determined for each blasting hole, uncoupled charges are used to fill explosives; (4) Initiating detonators are installed in each blasting hole, and each blasting hole is installed. The sequence of detonation adopts the series-parallel connection mode in which every four rounds of detonators are connected in parallel and then connected in series, and each detonator is connected to the detonator with the detonating wire of the detonator; (5) Seal the blast hole; (6) Test the network outside the cordon Resistor, when the measured resistance value is consistent with the estimated resistance value, it will start to detonate. The invention adopts the connection mode of optimized blasting and the effective method to reduce the resistance value of the network, effectively increase the number of blasting detonators, improve the blasting effect, and conduct large-section blasting at one time according to the blasting parameters of the lithological arrangement, which not only reduces unnecessary waste of chemical doses , and also reduce the labor intensity, save time and effort, and facilitate the transfer belt conveyor transportation.

Description

technical field [0001] The invention relates to a blasting method in the construction process of a rock roadway in mining, in particular to a large-section one-time blasting method of a rock roadway. Background technique [0002] For coal mine medium-hard rock and large-section tunnels, domestic and foreign mainly adopt the method of shallow holes and serial blasting operations. Due to shallow blastholes and many blasting times, the phenomenon of blind blasting generally does not occur, but this blasting operation method is efficient. Low, the tunneling speed is slow. If the coal mine has a large cross-section rock roadway and adopts a large-section blasting operation at one time, if the rock encountered is relatively hard and the blastholes are arranged more, even if the 200 blasters allowed in the coal mine are used, the phenomenon of blasting often occurs during the blasting process, which not only affects the blasting effect, waste of materials, and more seriously, a gr...

Claims

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Application Information

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IPC IPC(8): F42D1/00F42D3/04
Inventor 殷召元廖志强罗昆徐培铭戴成杰解波阚磊
Owner 安徽恒源煤电股份有限公司钱营孜煤矿
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