Medium-length hole air isolation blasting method

Abstract

The invention discloses a medium-length hole air isolation blasting method, and the method comprises the following steps of (1) perforation: perforating a blast hole oin a target area; (2) production of air isolated explosive: insulating the middle section of the blast hole from the air, filling the explosive oin the air-insulated section, ensuring the length of the air insulation to be 25 to 33 percent of the depth of the blast hole, filling fillers above the air isolation section, and ensuring the length of the filler to be 36 to 40 percent of the depth of the blast hole; and (3) delay segmental detonation: adopting a millisecond shock-conducting tube to carry out the elementary-error detonation, segmenting an air-isolated column to detonate, and ensuring the delay time to be 25milliseconds to 35milliseconds. The method has the beneficial effects that the middle-section air isolation technique and the millisecond elementary-error blasting technique are comprehensively utilized, the defects of dependence on manual work or low mechanical degree can be solved, the block size and shape of the broken rock pile which is suitable for machines to transport also can be supplied, the one-step blasting and falling stonevolume meeting the digging and transporting progress requirement can be supplied, the blasting quality can be effectively improved, and the blasting cost can be reduced.

Description

technical field [0001] The invention relates to an air isolation blasting method for medium and deep holes, belonging to the technical field of blasting. Background technique [0002] The existing open-pit blasting technology mainly relies on manual or semi-mechanized blasting operations, which has low operating efficiency and great potential safety hazards. At the same time, it is prone to large blasting vibration, high explosive consumption, and large block rate during the blasting process. High and unsatisfactory blasting quality, etc., cannot meet the size and shape of the broken rock pile mechanically excavated and transported, and the one-time blasting volume required by the progress of excavation. Contents of the invention [0003] The object of the present invention is to provide a medium-deep hole air isolation blasting method, which can improve the operation efficiency and blasting quality, and reduce the blasting cost. [0004] The object of the present inventi...

AI Technical Summary

Problems solved by technology

[0002] The existing open-pit blasting technology mainly relies on manual or semi-mechanized blasting operations, which has low operating efficiency and great potential safety hazards. At the same time, it is prone to large blasting vibration, high explosive consumption, and large block rate during the blasting process. High and unsatisfactory blasting quality, etc., cannot meet the requirements of the size, shape and excavation progress of the mechanically excavated broken rock pile.