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Experimental study on surface protection support that uses polymer thin spray-on layer.

Han Liang1, Zedi Zhang2, Yunjing Shi1

  • 1College of Mining, Liaoning Technical University, Fuxin, 123000, China.

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|August 8, 2025
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Summary
This summary is machine-generated.

Thin spray-on liner (TSL) offers superior support in underground coal mines compared to traditional metal mesh. This innovative method enhances bearing capacity and reduces rock deformation, providing a safer and more effective solution for roadway support.

Keywords:
Bearing mechanismRestraintRoadway supportShell structureTSL

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Area of Science:

  • Mining Engineering
  • Materials Science
  • Geotechnical Engineering

Background:

  • Thin spray-on liner (TSL) is increasingly utilized in mine sealing.
  • TSL presents a novel, high-bearing capability alternative to metal mesh for underground coal mine roadway support.
  • Its advantages include rapid deployment, automation, and adaptability to diverse geological conditions.

Purpose of the Study:

  • To analyze the support theories of TSL based on its deformation process in soft rock roadways.
  • To experimentally evaluate and compare the effectiveness of TSL against traditional support methods.
  • To investigate the TSL thin shell structure's support mechanism on various rock masses.

Main Methods:

  • Analysis of TSL support theories during soft rock roadway deformation.
  • Large-scale experimental testing using briquette coal pillar samples and polymer TSL material.
  • Experimental study of TSL thin shell structure on lignite and sandstone samples.
  • Numerical analysis of TSL stress distribution and surrounding rock deformation.

Main Results:

  • TSL forms a bonding layer, providing confinement and a thin shell structure for support.
  • TSL demonstrated a greater confining effect than metal mesh, increasing sample bearing capacity by 28.3%.
  • TSL enhanced residual strength and energy dissipation by 44.1%; TSL shell structure increased lignite and sandstone bearing capacity by 44.6% and 20.4%, respectively.

Conclusions:

  • TSL effectively supports underground roadways by confining rock mass deformation and forming a load-bearing shell structure.
  • Experimental and numerical results validate TSL's superior performance over metal mesh.
  • This research provides a theoretical foundation and experimental methodology for TSL support engineering in mines.