A Method for Uniform Energy Blasting of Peripheral Holes in Roadway Excavation

Abstract

The invention discloses a drivage peripheral hole homoenergetic blasting method. Peripheral holes (6) are dug on a roadway contour line of a surrounding rock (1) at the end part of a roadway; explosives (4) and cushioning materials (3) are alternatively arranged in each peripheral hole (6) from inside to outside; the explosives (4) in the adjacent peripheral holes (6) are distributed in a shape of a Chinese character pin; detonators (5) are arranged in sections along the explosives (4); nonel tubes (9) of the detonators (5) are led out of the holes along the hole walls of the peripheral holes (6); hole orifices of the peripheral holes (6) are plugged by stemming (2); then detonation is carried out according to a designed detonation network connecting line. According to the method disclosed by the invention, the explosives (4) and the cushioning materials (3) are distributed symmetrically, so that energy is more uniformly distributed, an energy utilization rate of the explosives is improved, a contour of a roadway section is well controlled, the back break phenomenon is avoided, and roadway supporting cost is reduced; meanwhile, the uniformly distributed explosive energy can enable a fragment size for blasting to be uniform, obviously improve a blasting effect and improve shovel-loading efficiency after blasting.

Description

technical field [0001] The invention relates to a blasting method for surrounding holes in roadway excavation, which is suitable for underground mine roadway excavation, stope mining, tunnel blasting and excavation, etc., can make the energy distribution of explosives uniform, improve the energy utilization rate of explosives, and form a smooth roadway The contour surface can better maintain the stability of the surrounding rock and improve the safety of construction operations. Background technique [0002] In underground roadway excavation and blasting, the peripheral holes are mainly to control the shape, size and contour of the roadway section after blasting to make it meet the design requirements. In the traditional blasting technology, due to the unreasonable charge structure of the peripheral eye, the uneven distribution of explosives, and the large damage to the surrounding rock, the phenomenon of overbreak and underbreak is very serious. The cost of surrounding roc...

AI Technical Summary

Problems solved by technology

However, the length of the air column in this technology is difficult to accurately control, and the charging process is complicated, and the manpower workload is large. When charging the peripheral eye, the water cannon mud is sent into the hole 300mm, and the cotton rope is held still with one hand, and the clay is used with the other hand. The hole is sealed by the gun mud to ensure that the length of the mud seal is 300mm, which is not suitable for large-scale industrial application

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