Cutting blasting method suitable for excavation of high-plasticity and low-strength rock tunnels

Abstract

The invention discloses a cutting blasting method suitable for excavation of high-plastic and low-strength rock tunnels, which is improved from two aspects of reducing the distance between the cutting holes and changing the charge structure of the cutting holes, and reduces the distance between the cutting holes. distance to ensure that the explosion stress wave energy produced by the explosive is much higher than the energy required for the plastic deformation of the plastic rock mass during the explosion, and the design of the auxiliary cut hole provides support for effectively expanding the cut cavity; the cut of the present invention The method is to arrange the nine holes of the main cutting hole, the center hole is filled with medicine, and the remaining eight holes are all empty holes. The auxiliary cutting holes are arranged in the upper, lower, left and right directions of the central nine holes and the four corners of the peripheral square. Cutting blasting is carried out by combining a small number of charging holes and a large number of empty holes, which improves the blasting efficiency, reduces the unit consumption of explosives, and improves the blasting effect of cut holes.

Description

technical field [0001] The invention relates to the field of tunnel excavation and blasting, in particular to a cutting and blasting method suitable for tunnel excavation of high-plasticity and low-strength rocks. Background technique [0002] For large-scale infrastructure and energy development projects such as water conservancy projects, tunnel projects, and mining projects, the primary construction process is the excavation of foundations and underground caverns. At present, tunnel excavation in water conservancy projects mainly adopts notch blasting. The function of notch blasting is to provide a free surface for the blasting of subsequent blastholes after the blasting of notch hole explosives throws rocks. Expansion provides compensation space. Therefore, whether the cutting is successful or not directly affects the blasting effect of the tunnel, and the depth of the cutting directly affects the cycle footage of the roadway excavation, which is the key to the success ...

AI Technical Summary

Problems solved by technology

[0018] The technical problem to be solved by the present invention is to provide a cutting blasting method suitable for tunnel excavation in high-plasticity and low-strength rocks, aiming at the failure of cutting or digging under the conditions of high-plasticity, low-strength or soft-hard rock formations by traditional cutting blasting methods. The disadvantages such as high cost of the slot, improve the blasting effect of the slot hole, improve the blasting efficiency, and reduce the unit consumption of explosives

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