A method for cutting roof and leaving roadway by using solid waste filling working face

By combining barrier nets and roof-cutting supports in coal mining, the problem of constructing roadway side supports has been solved, achieving stable roadway support and cost reduction, and improving the stability and economic benefits of roadway retention.

CN119933781BActive Publication Date: 2026-06-19CHINA UNIV OF MINING & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA UNIV OF MINING & TECH
Filing Date
2025-02-11
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

In existing technologies, the construction of roadway side supports for solid waste backfilling mining faces faces problems such as difficulty in roof connection of the backfill, complex construction processes, and high material costs. In particular, in the coal pillar-free roadway protection technology, it is difficult to effectively construct roadway side supports.

Method used

The method of combining barrier nets and roof-cutting supports is adopted. Barrier nets are installed in the reserved roadway and roof-cutting supports are set up. The roof-cutting supports relieve pressure on the rock strata below the basic roof and use the cut-off rock strata to form a roadway side support. Combined with shotcrete layer, stability is enhanced.

Benefits of technology

This achieved stable support for the tunnel, simplified the construction process, reduced costs, and improved the stability and economic benefits of the tunnel.

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Abstract

This invention relates to the field of coal mining technology and discloses a method for self-retaining roadway construction in a solid waste backfilling working face. The method includes the following steps: installing several barrier nets between the reserved roadway and the goaf; installing a roof-cutting support within the reserved roadway, with the bottom end of the roof-cutting support positioned on the bottom of the barrier nets and the top end of the roof-cutting support contacting the top end of the reserved roadway; filling the goaf with backfill material, cutting away the rock strata below the basic roof along the edge of the goaf, accumulating the cut-away rock strata on top of the backfill material to form a roadway-side support; and finally, dismantling the roof-cutting support. This invention facilitates the maintenance of the retained roadway, is simple in process, low in cost, provides high roadway stability, and yields significant economic benefits.
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