Tunnel millisecond blasting method

Abstract

The invention discloses a tunnel millisecond blasting method. The method comprises the following steps of 1, distributing of blast holes, the number of the blast holes and the blasting parameters of the blast holes are designed, wherein the blasting parameters of the blast holes comprise hole diameters, hole distances, resistance lines and depth of a periphery hole, an reliever hole and a cut hole; 2, the blast holes are drilled in a tunnel boring face to be blasted; 3, explosive loading is carried out on the blast holes drilled in the tunnel boring face; 4, blocking and compacting is carriedout on the blast holes filled with explosive; 5, time delay setting is carried out on digital electronic detonators in all the blast holes; and 6, after the time delay setting is finished, wire connecting is carried out, and sequential detonation is conducted after determining that no errors exist. Compared with an existing millisecond blasting technology which is complex in blasting mechanism anddoes not have explicit theory and practice supports, the tunnel millisecond blasting method has the advantages that the different cut blasting methods are adopted for different surrounding rocks andfield conditions, so that the purposes of improving blasting efficiency, reducing the vibration speed and saving financial resources are achieved.

Description

technical field [0001] The invention belongs to the field of underground engineering construction, and relates to a tunnel differential control blasting method. Background technique [0002] Guiyang is a karst landform. Because the construction tunnel section passes through the building, and the average rock hardness is about 120Mpa through core sampling, the rock hardness is extremely high, resulting in a very slow progress of cold excavation construction; in the disclosed technical plan, the blasting process As follows: firstly, all the cutout eyes are detonated by the same millisecond delay detonator, that is, all the cutout eyes are detonated at the same time; then, the auxiliary eye close to the cutout is detonated by the same millisecond delay detonator, and then the same millisecond delay detonator is used to detonate The remaining auxiliary eye close to the peripheral eye; finally, the peripheral eye is detonated with the same segment millisecond delay detonator. Th...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a tunnel differential control blasting method, to solve the problem that the traditional method cannot control and improve the effect of the blasting seismic stress wave interference and vibration reduction of differential blasting and the inability to realize high-efficiency excavation of ultra-hard rock micro-vibration under complex geological conditions technical issues

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