Energy collecting blasting and smooth surface blasting combined control blasting method

Abstract

The invention relates to an energy collecting blasting and smooth surface blasting combined control blasting method. The method comprises the following steps: (1) defining a periphery contour line for a blasting excavation region, and laying millisecond blasting holes in a main body blasting excavation region; (2) laying smooth surface blasting holes along the periphery contour line for the blasting excavation region; (3) laying a linear energy collecting blasting cutter and a low-section detonator above or in front of the rock mass to be cut for forming a plane penetrating through crack at one side, close to the main body blasting excavation region, of a reserved smooth surface layer within the periphery contour line of the blasting excavation region; (4) carrying out blasting and explosive charging on the millisecond blasting holes in the main body blasting excavation region, and laying a millisecond blasting detonator; (5) carrying out blasting and explosive charging on the smooth surface blasting holes, and laying a detonator; (6) blocking the millisecond blasting holes and the smooth surface blasting holes; (7) connecting a blasting circuit, and implementing blasting; (8) deslagging; and (9) repeating the steps above until finishing the excavation. According to the invention, the damage and fracture to the reserved rock mass are reduced, and at the same time, the forming quality of the wall surface at the periphery of the excavation region is improved.

Description

technical field [0001] The invention relates to a controlled blasting technology, in particular to a combined controlled blasting method of energy-gathering blasting and smooth surface blasting. Background technique [0002] Smooth surface blasting is a typical controlled blasting technology. It conducts correct drilling and charging on the peripheral contour of the excavation project, blasts away the rock mass in the main blasting excavation area, and then blasts and arranges it on the peripheral contour. The blasting charge on the smooth blasting hole on the upper surface blasts away the reserved smooth surface layer to control the scope and direction of the blasting, so that the contour of the excavation surface of the rock mass meets the design requirements and forms a flat and smooth wall surface. [0003] By using the law that the movement direction of detonation products is perpendicular or roughly perpendicular to the surface of the charge, it can be made into specia...

AI Technical Summary

Problems solved by technology

However, with the improvement of engineering construction requirements for blasting technology, such as partial demolition of precision machine piers, excavation of special underground projects, excavation of permanent tunnels, and slope cutting of major slope projects, very strict protection measures must be taken. Damage to the retained rock mass is not allowed, and it is required to strengthen the protection of the retained rock mass. However, smooth blasting or energy-concentrating blasting alone cannot meet the requirements of strict protection of the preserved rock mass and the surrounding environment.

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