Mine roadway advancing and undermining method and main blasting parameters

Abstract

The invention relates to a mine roadway advancing and undermining method and main blasting parameters. The mine roadway advancing and undermining method is characterized in that blast holes are arranged in a double-lug cracking undermining mode, the nine undermined blast holes are perpendicular to an upright working face and are arranged along an area which is below the center of the working face and separated from the center of the working face by the distance ranging from 10cm to 30cm, and form a cross, the central blast hole and the four end blast holes are charging holes, and holes among the central blast hole and the four end blast holes are empty holes; and vertical cracking undermined holes are detonated at first to form a cracking seam, and then the double-lug undermined holes are detonated, so that a prismatic slot cavity centered at the cross is formed. The main roadway advancing blasting parameters include the diameter of each blast hole, the pitch between each two blast holes, the depth of each blast hole, the number of the blast holes and specific explosive consumption. The empty holes used as free faces are added among the charging undermined holes arranged by the double-lug cracking undermining method, the millisecond blasting technology is adopted, and the blasting free faces are added, so that a clamping effect of ore rock is relieved, smooth undermining can be realized, and blast hole utilization rate can be increased to a great extent.

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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