A blasting method for anti-rejection blasting of layered rock mass with a gentle dip angle

Abstract

The invention discloses a blasting-proof blasting method for a layered rock mass with a gentle dip angle. Through geological forecasting and drilling process records, the distribution map of the rock formation in the blasting area is drawn; It is set on different rock layers, and a certain number of holes are arranged in the explosion area at the same time; a detonation point is set at the hole and the bottom of the hole, and the detonating cord runs through the entire charge. The upper and lower charge rolls are in close contact and in a straight line, and are detonated in a quincunx or V-shaped detonation manner. By improving the charge structure and optimizing the detonation mode, the present invention can solve the problem that the explosives fail to blast due to the mutual displacement of the rock layers during the blasting process of the layered rock mass with a slow dip angle, reduce the large block rate of the hard rock layer blasting, and avoid the lack of foundation surface. It not only improves the safety of the blasting network, but also facilitates rapid construction.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower engineering, and in particular relates to a blasting-proof blasting method for layered rock mass with a gentle dip angle, and is particularly suitable for blasting areas where there are layered rock masses with a gentle dip angle and part of the rock stratum with well-developed joint surfaces. Background technique [0002] Drilling and blasting, as an economical and efficient means of rock mass excavation, has been widely used in various basic engineering constructions and mining of mineral resources. With the continuous development of drilling equipment and transportation tools, the advantages of blasting excavation, such as high production efficiency, low cost and easy use of comprehensive mechanized construction, have gradually attracted people's attention. However, in step blasting, blastholes often pass through rock formations with different lithologies, as well as fa...

AI Technical Summary

Problems solved by technology

If the conventional hole layout method, charge method and detonation method are adopted, after the explosive is detonated, the explosion load pushes the surrounding rock mass, causing the rock mass around the subsequent blast hole to stagger. The distance easily exceeds the blasting distance, resulting in blast rejection; as a result, severe over-under-excavation occurs in the blast area, the rock mass is not fully broken, and the large-block rate is high, which poses a greater safety hazard in the subsequent cleaning process

In order to overcome the problem of blasting rejection in the prior art, the present invention intends to provide a blasting-proof blasting method for layered rock mass with a gentle dip angle, which can further improve the safety of the blasting network and reduce under-excavation of the foundation surface.

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