Channeling method in rapid roadway explosion

Abstract

The invention discloses a channeling method in rapid roadway explosion. The arrangement structure of channeling holes is as follows: a large-diameter central hole of which the diameter is phi 100-120mm and the depth is more than 4m is drilled in the central position of a channeling area at a roadway cross section; 4-6 smashing swelling holes are formed around the central hole; a row of smashing holes are formed among the smashing swelling holes; a row of auxiliary throwing holes at intervals of 0.5m are further formed below the smashing swelling holes at the lowermost part; the drilling direction of the auxiliary throwing holes inclines towards to a position above a roadway, so as to form an inclined angle which is less than 85 degrees with the roadway cross section; and subsequently explosive is filled for exploding to form channel cavities. The channeling method utilizes the minimum resistance line theory, and the central hole enlarges the smashing free surface and the smashing swelling space of a drilled channel, deeper channel cavities are formed, and the depths of the ordinary auxiliary holes and the ordinary around holes are further deepened to 4m, so that the explosion efficiency is improved, and the once explosion depth is increased.

Description

technical field [0001] The invention belongs to mine excavation technology, in particular to a blasting excavation method. Background technique [0002] In the excavation of underground roadways and rock tunnels, the drilling and blasting method is generally used. During drilling and blasting, blastholes are generally divided into cut holes, auxiliary holes, peripheral holes, and bottom holes; The contour line of the top and two sides is the peripheral eye, and the contour line of the bottom edge is the bottom eye. Since the cut hole is blasted first, a second free surface must be created for the blasting of the auxiliary hole, so the blasting effect of the cut hole is the key to the rapid blasting of the shaft. In the previous cut eye design, the cut eye has various forms, such as wedge cut, tapered cut, straight eye cut and so on. With the development of medium and deep hole blasting technology and the application of drilling jumbo, straight hole cutting is the most com...

AI Technical Summary

Problems solved by technology

Restricted by the drilling equipment, the diameter of the cutting hole is equal to that of other blasting holes, generally 32-40mm. Since there is only one free surface during the cutting blasting, and it is affected by the clamping force of the surrounding rocks, the blasting depth is limited to a certain extent. Generally, each blasting is less than 3m, and a lot of dense cutting holes are arranged, which affects the speed of excavation

At present, with the development of drilling equipment, especially the emergence of down-the-hole drills, it is no longer a problem to drill blastholes with a diameter of more than 100mm; therefore, the use of large-diameter straight hole cutting can solve the problem of low cutting blasting efficiency

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