A deep hole cutting blasting method in medium hard rock

Abstract

The invention discloses a medium-hard rock deep-hole cut blasting method, which relates to the field of shaft and drift cut blasting and can reduce the affection of blasting noise and vibration on surrounding environments. The method includes the following steps: a special drilling machine is used for drilling a big central hole at the center of the section of a roadway; cut holes are arranged around the central hole for rock breaking; supplementary holes and surrounding holes are then sequentially outwardly arranged around the cut holes with the central hole as a center; charges are loaded into the cut holes, the supplementary holes and the surrounding holes; blasting is carried out according to a cut hole-supplementary hole-surrounding hole blasting sequence, and thereby one-step blast excavation is realized. The medium-hard rock deep-hole cut blasting method is applicable to medium-hard rock deep-hole cut blasting in underground roadways.

Description

technical field [0001] The invention relates to a method for deep hole cutting blasting, in particular to a method for cutting and blasting deep holes (more than 3.5 meters) in medium-hard rock (the Platts coefficient f is greater than 7). Background technique [0002] At present, there are mainly two kinds of operation methods in coal mine rock roadway excavation in my country: one is drilling and blasting construction, and the other is mechanical excavation construction. The mechanized excavation of rock roadways in my country has slow speed, large loss of picks, high dust and poor adaptability, etc. The problem is that the drilling and blasting method is currently the main rock roadway excavation method in my country because of its good applicability. Coupled with the traditional small-circulation wedge-shaped cutting method, the coal mine rock roadways in my country have problems such as slow footage and high labor intensity. According to relevant data, at present, shallow...

AI Technical Summary

Problems solved by technology

[0002] At present, there are mainly two kinds of operation methods in coal mine rock roadway excavation in my country: one is drilling and blasting construction, and the other is mechanical excavation construction. The mechanized excavation of rock roadways in my country has slow speed, large loss of picks, high dust and poor adaptability, etc. The problem is that the drilling and blasting method is currently the main rock roadway excavation method in my country because of its good applicability. Coupled with the traditional small-circulation wedge-shaped cutting method, the coal mine rock roadways in my country have problems such as slow footage and high labor intensity. According to relevant data, at present, shallow-hole and multi-cycle drilling and blasting tunneling methods are mostly used in coal mine rock roadways in my country. This excavation method has a small amount of blasting at one time and many blasting times. At the same time, the blasting noise and vibration during the blasting operation also have an impact on the surrounding environment and residents. In the long run, it is not conducive to reducing the mining cost of investors and improving economic benefits.

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