Mine roadway advancing and undermining method and main blasting parameters

Abstract

The present invention relates to a method of tunneling and cutting in mine level roadway and the main parameters of blasting. Blast holes are arranged in the way of cracking and cutting with double ears. The nine cutting holes are perpendicular to the upright working surface and are lower and lower along the center of the working surface. 10-30cm cross arrangement, in which the center blast hole and the four end blast holes of the cross are the charge holes, and the holes between the center blast hole and the four end blast holes are empty holes: firstly, the vertical crack cut is detonated The hole forms a tortoise crack, and then detonates the amphora cut hole to form a prismatic cavity centered on the cross. The main parameters of tunneling and blasting include blast hole diameter, blast hole spacing, blast hole depth, blast hole number and unit explosive consumption. In the binaural crack cutting method, a free hole is added between the charging and cutting holes, and the millisecond differential blasting technology is adopted to increase the blasting free surface and reduce the sandwiching effect of ore rock, which can not only cut smoothly, It can also greatly improve the utilization rate of the blast hole.

Description

technical field [0001] The invention relates to a mine mining technology, in particular to a method for excavating and cutting a mine level roadway and main parameters of blasting. Background technique [0002] The tunneling method of rock drilling and blasting is adopted in the mine level entry. The charge blast hole in the center of the working face is blasted before the surrounding charge blast holes, commonly known as cutting, so as to create a blasting free surface of the peripheral blast holes and improve blasting efficiency. The barrel-cut method is traditionally used for tunneling of medium-hard ore rocks in the Kumeishan Tungsten Mine in Jiangxi. The cut is arranged along a cross 10-30 cm below the center of the working face, and the central blasthole of the cross is an empty hole. The blastholes at the four ends of the periphery are charging holes, and there is not enough free surface between the slotted holes, which cannot provide enough compensation space for the...

AI Technical Summary

Problems solved by technology

The barrel-shaped cutting method is traditionally used in the headway excavation of medium-hard ore rocks in the Kumeishan Tungsten Mine in Jiangxi. The cutting is arranged along a cross 10-30 cm below the center of the working face, and the central blast hole of the cross is an empty hole. The blastholes at the four ends of the periphery are charging holes, and there is not enough free surface between the slotted holes, which cannot provide enough compensation space for the broken ore rock, which increases the sandwiching effect of the ore rock, and makes slotting difficult.

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