Method and device for segmental blasting in medium and deep holes

Abstract

The invention relates to the technical field of blasting processes, in particular to a segmented blasting method and device for medium-depth holes. The method includes the steps of determining the range of an actual hole net area S, wherein S is equal to or greater than 0.7 S and equal to or smaller than 0.9 S; on the basis of the single-hole explosive payload and the maximum single-segment explosive payload of a blasthole, determining the segmented explosive loading segment number of segmented explosive loading and blasting, and according to the segmented explosive loading segment number, determining the length L1 of a first filling segment, the length h1 of a first layer explosive loading segment, the length Li of the ith filling segment under the first layer explosive loading segment and the length hi of the ith layer explosive loading segment during segmented explosive loading and blasting, wherein the first filling segment, the first layer explosive loading segment, the ith filling segment and the ith layer explosive loading segment are sequentially disposed at the position close to the earth surface from top to bottom; setting the blasthole explosive payload of a hole net andthe quantity of solid fillers for filling according to the parameters above and setting short-delay interval blasting time of every two adjacent blastholes in each horizontal segment among horizontalrows and the short-delay interval blasting time among horizontal holes; according to the calculation value of the short-delay interval blasting time of one blasthole segment in the vertical direction, setting the actual value of the short-delay interval blasting time of the blasthole segment in the vertical direction to be 1.2-1.3 times higher than the calculation value. Therefore, the blasting quality is improved.

Description

technical field [0001] The invention relates to the technical field of blasting technology, in particular to a method and device for segmental blasting of medium and deep holes. Background technique [0002] In the blasting technology used in existing open-pit mines or geotechnical engineering, due to the large number of equipment and facilities used on site, the surrounding environment is also relatively complicated, and it is relatively difficult to control the blasting. [0003] The rock block with a diameter of about 10 cm was used for 10 times of push-and-drop tests, and the probability of falling on the adhesive tape was measured to be 50%, so the adhesive tape has no normal protective measures, safety and quality control is difficult, and blasting is difficult. [0004] In order to implement controlled blasting, it is required that the blasting should have no forward rush and collapse, no blasting flying rocks, and no vibration falling rocks. The 3-5m small-section hi...

AI Technical Summary

Problems solved by technology

Although the above objectives can be achieved, the number of layers required for perforation blasting and electric shovel mining is large, the operation efficiency is low, and it is uneconomical

In addition, in order to reduce the blasting vibration in the nearby area, measures such as reducing the hole network parameters, using small-aperture drilling rigs, and layered blasting were forced to take measures. Not only the operation efficiency is low and uneconomical, but also there are many large pieces after blasting and the quality is poor.

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