Partition and grading paste filling treatment and construction structure of open pit connecting underground goaf

The application of a three-stage filling structure and a Y-shaped diversion device has solved the problems of unreasonable load-bearing capacity and low solid waste utilization rate in open-pit to underground mining, achieving safe, economical and efficient management and ecological restoration of the goaf, and improving resource recovery rate and mining safety.

CN122215849APending Publication Date: 2026-06-16CHIFENG CNMC BAIYIN NUOER MINING CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHIFENG CNMC BAIYIN NUOER MINING CO LTD
Filing Date
2026-04-30
Publication Date
2026-06-16

AI Technical Summary

⚠Technical Problem

Existing technologies cannot effectively solve the problems of unreasonable bearing structure, high filling cost, uneven diversion, disconnect between underground and open-pit management, low solid waste utilization rate and insufficient ecological restoration in complex goaf areas during the conversion from open-pit to underground mining. This results in poor safety and economic efficiency, making it difficult to meet the needs of deep mining.

⚗Method used

By adopting a three-stage filling structure (high-strength rigid isolation, medium-strength flexible buffer, and low-strength high-efficiency compaction) and a Y-shaped multi-path independent diversion device, synchronous, zoned, precise, and efficient filling of underground voids and open pits is achieved, constructing a stable load-bearing system. Solid waste is used as a low-strength filling material, combined with surface transportation and underground graded filling processes, forming a complete process management system from surface preparation, pipeline transportation, precise diversion, to underground graded filling.

🎯Benefits of technology

It has achieved safe, reliable, economical and efficient management of goaf areas, reduced backfilling costs, improved resource recovery and solid waste utilization rates, protected the safety of the underlying ore body, improved mining conditions, and achieved the integrated goal of ecological restoration and safety management.

✦ Generated by Eureka AI based on patent content.

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Abstract

A kind of open pit communicates with underground goaf's partition grading paste filling treatment and construction structure belongs to the technical field of mine goaf disaster treatment and green mine construction, including surface conveying structure, shunt distribution structure, underground filling structure, open pit filling structure four parts.Each part is connected with each other, and cooperates, constitutes the whole process management system from surface preparation, pipeline transportation, accurate shunt, underground grading filling to open pit overall backfilling, and builds stable and reliable bearing and waterproof safety isolation system for underground ore body safe mining.The advantage is that it can significantly improve the filling density, reduce the comprehensive cost, improve the construction efficiency, eliminate the risk of goaf instability and surface subsidence, effectively protect the integrity of the lower ore body, improve the stress environment of underground surrounding rock, create stable conditions for safe and efficient mining of underground ore body, realize solid waste resource utilization and mine ecological restoration, and is suitable for safe and efficient treatment of complex goaf in metal and non-metal mines.
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