Segmented plugging blasting method for upward drilling

By employing a segmented sealing blasting method in the upward drilling, and using a charge structure with alternating expansion and contraction connecting sections and barbed structures, the problems of charge slippage and insufficient energy were solved, thus achieving optimized distribution of blasting energy and improved safety.

CN121994092APending Publication Date: 2026-05-08CCTEG COAL MINING RES INST
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Patent Information

Application Number
CN202610212496.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-13
Publication Date
2026-05-08

AI Technical Summary

Technical Problem

In upward drilling, the charge structure is prone to slippage, resulting in uneven charge distribution, insufficient explosive energy, and severe attenuation of the explosive shock wave in the air, which cannot be effectively transmitted to the rock mass, increasing the risk of large rock fragments and construction costs.

Method used

The segmented sealing blasting method is adopted, using a charge structure with alternating expansion and contraction sections, combined with barbed structures and vent pipes, to ensure the stability of the charge structure in the borehole. The charge is filled and solidified with grout to form a multi-stage sealing, preventing gas escape and optimizing the axial distribution of blasting energy.

Benefits of technology

It effectively prevents the explosive charge structure from falling, ensures that the blasting energy is enhanced in the orifice area, reduces the proportion of large pieces, improves blasting efficiency and safety, and reduces construction costs.

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Abstract

The blasting method comprises the steps that according to engineering geological conditions and blasting effect requirements, blasting engineering design is carried out, drilling parameters, a detonating time sequence and plugging requirements are determined, according to the drilling parameters, a charging structure matched with the specification is selected, and a blasting process is carried out according to the selected charging structure. And the explosive charging structures filled with the explosives are assembled outside the drill hole according to the designed interval, the drill hole is pushed, and a hole opening is blocked. And the space between the charging structure and the hole wall of the drill hole is filled with rapid hardening slurry, and gas in the drill hole is exhausted through the exhaust pipe. And after the slurry in the hole is solidified, final connection of the detonating network is completed in a safe area outside the hole, and after comprehensive inspection and warning setting, a detonating station commands to excite the network to achieve detonating. According to the segmented plugging blasting method for the ascending drill hole, the hole sealing length is shortened, the axial distribution of blasting energy is optimized, the energy effect of a hole opening area is effectively enhanced, and the boulder rate is reduced.
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