Blasting method based on joint control of hole inside energy accumulation blasting and smooth blasting

Abstract

The invention relates to a blasting method based on joint control of hole inside energy accumulation blasting and smooth blasting. The method comprises the steps of: (1) defining a peripheral profile line for a blasting excavation region, and arranging a micro-difference blasting hole in a main body blasting excavation region; (2) arranging a smooth blasting hole along the peripheral profile line in the blasting excavation region; (3) arranging a hole-inside-energy-accumulation blasting hole at one side of a reserved smooth layer close to the main body blasting excavation region in the peripheral profile line of the blasting excavation region; (4) performing hole inside energy accumulation blasting charge on a hole inside energy accumulation blasting explosive column with V-shaped grooves, and arranging low section detonators in the explosive column; (5) performing blasting charge on the micro-difference blasting hole, and arranging micro-difference blasting detonators; (6) performing blasting charge on the smooth blasting hole, and arranging the detonators; (7) blocking the blasting holes; (8) connecting a priming network for blasting; (9) deslagging; and (10) repeating the above steps until completion of excavation. According to the blasting method based on joint control of hole inside energy accumulation blasting and smooth blasting provided by the invention, the wall forming quality of a reserved rock body is improved while the damage and cracking of the reserved rock body are reduced to maximum extent.

Description

technical field [0001] The invention relates to a controlled blasting technology, in particular to a combined controlled blasting method of in-hole energy-gathering blasting and smooth surface blasting. Background technique [0002] Smooth surface blasting is to carry out correct drilling and charge on the contour line of the blasting excavation area, blast the rock mass in the main blasting excavation area, and then detonate the blasting hole charges arranged on the peripheral contour line to It is a kind of blasting technology that the reserved smooth surface layer is blasted to control the range 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. [0003] Utilizing the rule that the direction of movement of detonation products is perpendicular or roughly perpendicular to the surface of the charge, a special-shaped charge can be made, which can make the detonation prod...

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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