A method for reducing surface subsidence in goaf-overburden delamination three-dimensional filling mining

The surface subsidence reduction mining method using three-dimensional filling of goaf and overlying strata delamination resolves the contradiction between existing goaf and overlying strata delamination grouting mining methods, achieving efficient and low-cost subsidence control, improving resource recovery rate and mining efficiency, and protecting the ecological environment.

CN120889616BActive Publication Date: 2026-05-26ANHUI UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ANHUI UNIV OF SCI & TECH
Filing Date
2025-09-03
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing methods for filling mining areas and grouting mining methods for overburden separation each have their own contradictions regarding cost, efficiency, and subsidence control effects, making it difficult to form an efficient, low-cost, and highly reliable integrated mining technology system, thus limiting the large-scale application of surface subsidence control.

Method used

The surface subsidence reduction mining method of goaf-overburden separation three-dimensional filling is adopted. By designing a longwall mining system, goaf filling and separation grouting are implemented in stages. Differentiated grout ratios and precise filling step distances and grouting hole spacings are used to form a three-dimensional control structure of lower support and upper sealing. Combined with numerical simulation and dynamic control of grouting pressure, the precise diffusion and rapid molding of grout are achieved.

Benefits of technology

It significantly enhances subsidence control capabilities, improves resource recovery rate and process efficiency, reduces surface subsidence, protects the ecological environment, lowers land reclamation costs, and optimizes mining continuity.

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Abstract

This invention discloses a method for surface subsidence reduction mining using three-dimensional backfilling of goaf-overburden separation, belonging to the field of rock strata mining. It includes mining area planning and working face design, surface backfilling system construction, backfilling parameter design, goaf backfilling operation, overburden separation grouting operation, and cyclic operation. This invention significantly enhances subsidence control capabilities. Goaf backfilling forms a rigid support layer that directly absorbs roof pressure, while overburden separation grouting creates a hydraulic barrier below the key layer, inhibiting separation expansion. The two work together to construct a three-dimensional control structure of lower support and upper sealing, greatly reducing surface subsidence, increasing coal resource recovery rate, and reducing resource waste. Coal gangue is used as the main backfilling material. Goaf backfilling and separation grouting are implemented in stages: goaf backfilling at the first mining face, and separation grouting at the two working faces, reducing interference of backfilling operations on the mining cycle.
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