Strip mine blast hole charging structure above goaf and layered explosion control system

By employing a segmented charging structure, shaped charge tubes, and buffer layers within the blast holes of open-pit mines, combined with a layered blast control system using foam blocks and rigid plates, the problems of stress wave reflection and structural instability in goaf areas were solved, thereby improving blasting efficiency and safety.

CN224285679UActive Publication Date: 2026-05-26GUANGDONG PROVINCE DABAOSHAN MINING CO LTD +1
View PDF 1 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
GUANGDONG PROVINCE DABAOSHAN MINING CO LTD
Filing Date
2025-07-03
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

During open-pit blasting, the goaf leads to the reflection of blasting stress waves and low energy utilization. The overlying strata of the goaf are prone to forming large hard rock areas. Blasting vibrations cause structural instability, which may trigger goaf collapse and chain collapses. Traditional support structures cannot actively compensate for blasting stress.

Method used

It adopts a segmented charge structure, uses air columns to separate the explosive sections, and sets up blasting energy-concentrating tubes and honeycomb structure buffer layers in the blast holes. Combined with the main stress compensation layer and auxiliary buffer layer of foam blocks and rigid plates, it is fixed by detachable anchoring components. The foam blocks are monitored and adjusted in real time to absorb and disperse the blasting impact energy.

Benefits of technology

Effective control of blasting energy transfer reduces disturbance to the goaf, improves blasting efficiency and safety, reduces the risk of goaf collapse, and achieves directional energy release and uniform stress transfer.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN224285679U_ABST
    Figure CN224285679U_ABST
Patent Text Reader

Abstract

The utility model discloses a strip mine blast hole charging structure above a goaf and a layered explosion control system, which adopt a subsection charging structure, adjacent explosive sections are separated by an air column, a buffer layer with a honeycomb structure is arranged between the explosive section at the bottommost layer and the bottom of a blast hole, the air column is arranged above the explosive section at the topmost layer, and the hole is sealed by stemming; the explosive section is filled in the blasting energy gathering pipe and is separated from the wall of a blast hole, a main stress compensation layer and an auxiliary buffer layer are sequentially and fixedly arranged close to the wall of a goaf top plate, the main stress compensation layer is laid by foam blocks, the auxiliary buffer layer is a hard plate, direct friction between the foam blocks of the main stress compensation layer and the goaf top plate is reduced, and local stress concentration is dispersed. According to the utility model, through directional energy release of the blast hole charging structure of the strip mine at the upper part and cooperation of active stress compensation and vibration monitoring in the goaf at the lower part, dual improvement of blasting efficiency and safety under the condition that the goaf exists is realized.
Need to check novelty before this filing date? Find Prior Art