Water pressure blasting method used in tunnel construction

Abstract

The invention provides a water pressure blasting method used in tunnel construction, and relates to the blasting method used during tunnel construction. The method is mainly invented for solving the problems that at present, a conventional blasting method used in tunnel construction causes large rock ballast blocks and much raised dust and is wide in pile bottom diffusion range, low in residue loading work efficiency and low in work efficiency. Firstly, a shot hole is punched, a water bag is arranged at the bottom in the shot hole, charge is arranged above the water bag, two water bags are arranged above the charge, and finally the shot hole is refilled with and plugged by stemming. The method has the advantages that raised dust is little, rock ballast is well smashed, stone is small, the work environment is improved, the residue loading work is easily conducted, and time is saved by half an hour or longer.

Description

Technical field: [0001] The present invention relates to blasting methods used in the construction of tunnels. Background technique: [0002] The conventional blasting method applied when constructing tunnels at present refers to the blasting method that adopts the blasting hole without backfill plugging or only stuffs the blasting hole with paper rolls, etc. The fracture of the surrounding rock of the blasthole is the result of the joint action of the stress wave generated by the explosive explosion and the expansion of the explosive gas. Explosives lose energy due to air compression during the process of propagating in the air after blasting, and the stress wave is also weakened correspondingly when it is transmitted to the surrounding rock, so it is not conducive to the breaking of the surrounding rock; the explosive gas expands very quickly and rushes out of the eye opening, weakening Therefore, it is unscientific and undesirable to say that the blasthole has no backfil...

AI Technical Summary

Problems solved by technology

Explosives lose energy due to air compression during the process of propagating in the air after blasting, and the stress wave is also weakened correspondingly when it is transmitted to the surrounding rock, so it is not conducive to the breaking of the surrounding rock; the explosive gas expands very quickly and rushes out of the eye opening, weakening Therefore, it is unscientific and undesirable to say that the blasthole has no backfill plugging

The disadvantages of this conventional blasting method are that the stone slag blocks are larger, the dust is more, and the spread of the bottom of the pile is larger, the efficiency of slag loading operation is low, and the work efficiency is low.