A mixed rock-breaking process of smooth blasting and split blasting

Abstract

The invention discloses a rock-breaking process combining smooth blasting and splitting blasting. The face (1) is divided into a blasting area (2) and a splitting area (3), and the splitting area (3) is surrounded by On the periphery of the blasting area (2), there is an air surface (7) between the blasting area (2) and the splitting area (3), and contour lines are set around the splitting area (3); inside the blasting area (2) there is a A plurality of blasting holes (5), and a plurality of splitting holes (6) are arranged on the contour line (4) of the splitting area (3); The splitting operation is performed on the contour line of the blasting area (2), and the cracked surface after blasting in the blasting area (2) is wrapped in the contour line of the splitting area. Compared with the conventional smooth blasting method for tunnel excavation, this construction method reduces the disturbance of the surrounding rock due to blasting, protects the surrounding rock to the maximum extent, and reduces the risk of rockfall and collapse during excavation.

Description

technical field [0001] The invention relates to the field of tunnel excavation construction, in particular to a rock-breaking technology in which smooth surface blasting and split blasting are mixed. Background technique [0002] At present, smooth blasting technology is mostly used in the construction of tunnels in rock excavation areas. During construction, the excavation contour line is smoothed through the drilling arrangement of blastholes around the excavation section, the control of charge amount and charge situation, and the final detonation method. It meets the requirements of over- and under-excavation required by the code, reduces the disturbance to the surrounding rock, and protects the self-supporting capacity of the rock. However, in actual construction, due to the dynamic changes of the surrounding rock and the heterogeneity of the surrounding rock, the blasting design cannot be refined, and it is difficult to control during construction. It cannot meet the s...

AI Technical Summary

Problems solved by technology

However, in actual construction, due to the dynamic changes of the surrounding rock and the heterogeneity of the surrounding rock, the blasting design cannot be refined, and it is difficult to control during construction. It cannot meet the specification requirements, disturb the surrounding rock, increase the safety risk of excavation, increase the amount of backfill concrete, and increase the project cost

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