Efficient segmented blasting method in tunneling process

Abstract

The invention relates to the technical field of tunnel gun hole blasting vibration, in particular to an efficient segmented blasting method in a tunneling process. Gun holes are distributed according to a tunneling section, geological conditions, circulating footage and the like; the in-hole segmented millisecond blasting is performed by a digital electronic detonator; the millisecond time precision is improved; the first blasting of explosives at the upper parts of the gun holes is realized; and a free surface is provided for blasting of explosives at the lower parts, so that the blasting effect is guaranteed. The method adopts the in-hole segmented millisecond blasting, reduces the blasting vibration speed, and increases the circulating footage.

Description

technical field [0001] The invention relates to the technical field of tunnel blasting vibration, in particular to a high-efficiency segmental detonation method during tunnel excavation. Background technique [0002] With the continuous development of the transportation industry, road and railway tunnels will inevitably pass through towns during the excavation process, and the drill and blast method is most widely used in tunnel excavation, but large-span shallow tunnels may be excavated by blasting. Large blasting vibration, flying rocks and noise are generated, which have adverse effects on surrounding structures and high-voltage lines. Therefore, excavation in cities and towns requires high construction technology, which not only ensures the excavation progress of the tunnel, but also meets the relevant national safety standards. specification. [0003] There are many ways to reduce blasting vibration. The common ones are reducing the amount of single blasting charge, sh...

AI Technical Summary

Problems solved by technology

[0002] With the continuous development of the transportation industry, road and railway tunnels will inevitably pass through towns during the excavation process, and the drill and blast method is most widely used in tunnel excavation, but large-span shallow tunnels may be excavated by blasting. Large blasting vibration, flying rocks and noise are generated, which have adverse effects on surrounding structures and high-voltage lines. Therefore, excavation in cities and towns requires high construction technology, which not only ensures the excavation progress of the tunnel, but also meets the relevant national safety standards. specification

[0003] There are many ways to reduce blasting vibration. The common ones are reducing the amount of single blasting charge, shortening the cycle footage, blasting with millisecond differential time, etc. However, the expected vibration reduction effect cannot be achieved in complex environments. Currently, digital electronic detonators are widely used. Applied to the cutting hole blasting process in complex environments, the research shows that compared with ordinary nonels, digital electronic detonators have more accurate millisecond delay time, better vibration reduction effect and better blasting effect

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