Deep-hole blasting construction technology in fractured rocks

Abstract

The invention discloses a deep-hole blasting construction technology in fractured rocks. The technology comprises the following steps: firstly finding out information such as joint fracture occurrence in the inner wall of a blasting hole, development degree, space position by utilizing a drilling camera shooting technology; and then carrying out optimization design for blasting parameters, such as explosive load of a blasting hole, explosive load structure, the length of an explosive roll, blasting sequences according to the storage condition of the joint fracture in each blasting hole, thus the aim to improve the blasting effect, reduce the effect of blasting quality by the fracture and reduce the blasting cost is realized. The technology provided by the invention is especially suitable for a medium-deep hole blasting construction technology of soft cracked crocks of joint fracture of underground metal ores, the effect degree for blasting quality by joint fracture of the crocks can be reduced effectively, the damage to surrounding rocks by the blasting shock is reduced, the damage caused by shock waves to surrounding drill holes is reduced, and the blasting cost is saved.

Description

technical field [0001] The invention relates to a medium-deep hole blasting construction technology of fissured rock mass, in particular, it is suitable for the medium-deep hole blasting construction technology of soft broken ore bodies with developed joints and fissures in underground mines. Background technique [0002] The destructive effect of cracked rock mass blasting technology on rock mass is mainly formed and developed along the structural crack surface and certain directions of the structure cut by it. When blasting in a rock mass with developed joints and fissures, the joints and fissures with the dominant fracture direction will guide the rock breaking. Therefore, the joints and fissures in the rock mass have an important influence on the blasting parameters, blasting energy utilization rate, blasting fragmentation, and the stability of surrounding buildings or structures. Therefore, eliminating (or utilizing) rock joints and fissures has theoretical guidance an...

AI Technical Summary

Problems solved by technology

However, due to the lack of understanding of the microstructure of the rock, especially the lack of understanding of the development of joints and fissures on the inner wall of the blasthole, it is difficult to judge and evaluate the degree of influence of joints and fissures on the blasting effect in the currently used medium and deep hole blasting technology, which cannot be effective. The influence of elimination (or utilization) of joint fissures on blasting quality

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