Medium-hard rock deep-hole cut blasting method

A deep hole, hard rock technology, applied in the field of medium hard rock deep hole cut blasting, can solve the problems of small blasting volume, impact of blasting noise and vibration, and poor blasting operating conditions, so as to reduce clamping effect and absorb blasting noise , the effect of reducing blasting noise

Active Publication Date: 2015-03-04
CHINA UNIV OF MINING & TECH (BEIJING)
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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 r

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  • Medium-hard rock deep-hole cut blasting method
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  • Medium-hard rock deep-hole cut blasting method

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Embodiment Construction

[0040] A method for deep-hole cut blasting in medium-hard rock according to an embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0041] It should be clear that the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0042] see figure 1 and figure 2 , a method implementation of deep hole cutting blasting in medium-hard rock of the present invention, comprising steps:

[0043] S1, drill a central hole k1 at the center of the roadway section S with a drilling rig;

[0044] Drill a center hole on the working surface first, so that the working surface forms a second free surface, creating favorable conditions for the blasting of other blastholes and improving t...

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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...

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Application Information

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IPC IPC(8): F42D1/00F42D3/04
Inventor 杨仁树郭东明
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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