System and method for charging peripheral hole in smooth blasting of tunnel

Abstract

The invention provides a system and a method for charging a peripheral hole in smooth blasting of a tunnel. The system comprises an elastic C-shaped pipe, curing foam, an explosive cartridge and a detonating apparatus, wherein the length of the C-shaped pipe is matched with the length of the to-be-charged peripheral hole; the curing foam is coated to the inner wall of the C-shaped pipe, the explosive cartridge fills the C-shaped pipe and is positioned by an elastic constraining force of the C-shaped pipe, and the detonating apparatus is inserted into the explosive cartridge. When the peripheral hole is charged, the C-shaped pipe filled with the explosive cartridge and the detonating apparatus is plugged into the peripheral hole and the outer wall of a part, coated by the curing foam, of the C-shaped pipe is attached to a hole wall, located on one side of a surrounding rock, of the peripheral hole. The system provided by the scheme plays roles of buffering the pressure to protect the wall and guiding energy release, so that the detonating damage to the surrounding rock is reduced effectively, the crushing action to an excavated rock body is enhanced, and differentiated action of peripheral hole blasting is achieved. The system and the method are particularly suitable for excavating the tunnel with a joint crushed zone.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a system and method for charging peripheral holes in tunnel smooth surface blasting. Background technique [0002] With the large-scale construction of high-speed railways, expressways, and urban comprehensive utility corridors in my country, there are more and more tunnel projects. Tunnel excavation operations have high requirements for peripheral contour shaping, and smooth blasting has become the most commonly used controlled blasting technology. [0003] At present, there are mainly the following problems in smooth blasting construction of tunnels: there is no special explosive for smooth blasting with excellent performance available on the construction site; the explosives in the peripheral holes are usually charged with "charge strings" made of powder rolls and bamboo chips, and detonating cords are used as transmissions. Explosive media, bamboo chip processing ...

AI Technical Summary

Problems solved by technology

[0003] At present, there are mainly the following problems in smooth blasting construction of tunnels: there is no special explosive for smooth blasting with excellent performance available on the construction site; the explosives in the peripheral holes are usually charged with "charge strings" made of powder rolls and bamboo chips, and detonating cords are used as transmissions. Explosion media, bamboo chip processing and charge roll binding procedures are cumbersome, time-consuming and labor-intensive; manual use of blasting sticks to charge charges at intervals roll by roll, subject to large human interference factors, it is difficult to accurately control the position and spacing of charge rolls, and cannot meet the blasting design requirements; The charges are charged at intervals, and over-excavation is likely to occur at the concentration of the charge rolls, which affects the effect of light blasting and the stability of the surrounding rock.

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