Blasting method of driving, mining and cutting drift under ultrahard fault

Abstract

The invention discloses a blasting method of a driving, mining and cutting drift under an ultrahard fault and is characterized in that the method can be used to increase the blasting effect. The blasting method comprises the following steps: 1) drilling detonating cave blastholes on both sides of a fault plane 2) placing detonators and explosive in the detonating cave blastholes; 3) shooting the detonators and explosive in the detonating cave blastholes to obtain detonating caves; 4) drilling auxiliary blastholes around the detonating caves, drilling peripheral blastholes around the auxiliary blastholes; 5) placing detonators and explosive in the auxiliary blastholes and the peripheral blastholes; and 6) shooting the detonators and explosive in the auxiliary blastholes and the peripheral blastholes. During the blasting process of the mining and cutting drift, primary blasting is firstly performed to obtain free space for secondary blasting so that the mechanical property of country rocks can be changed and the mining and cutting drift with better smooth surface effect can be obtained after the next blasting; and the method is especially suitable to be used in the projects such as drift driving and mining approach road driving under special geological conditions.

Description

technical field [0001] The invention relates to a blasting method, in particular to a blasting method for excavating and cutting roadways under extremely hard fault conditions. Background technique [0002] At present, in the process of mining, mining roadway, cutting roadway, and medium and deep hole rock drilling are three important early steps in caving mining. Among them, the formation quality of the mining and cutting roadway will largely affect the rock drilling work of the medium and deep hole jumbo and the quality of ore collapse in the later stage. Therefore, the requirements for the section quality of the mining and cutting roadway are relatively high. How to quickly, efficiently and safely deliver the mining roadway to use on schedule has become an important issue. Especially under special conditions, the construction of rock drilling rigs will be greatly affected, and there are greater difficulties in safety management, quality management and progress managemen...

AI Technical Summary

Problems solved by technology

This sudden large stress may even cause the charging hole of the post-blasting to be "crushed", and part of the detonator explosives will fail to explode, making the blasting effect poor.

In this way, secondary blasting is still required, which not only wastes raw materials and man-hours, but also the section formed by blasting is extremely rough and cannot achieve the effect of light blasting.

Images