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Mine Support, Radiation and Ventilation Control with Spray-on Barriers

by J. F. Archibald, Dep of Mining Engineering, Kingston, Canada,
E. M. De Souza, Dep of Mining Engineering, Kingston, Canada,



Document Type: Proceeding Paper

Part of: High Level Radioactive Waste Management 1993

Abstract:

The use of spray-on liner agents to provide localized excavation support in place of traditional techniques such as shotcrete or bolts-and-screen has been the subject of extensive investigation. Several agent materials have been assessed for use in underground excavation support situations, with optimal performance being shown by a polyurethane-based composition designated Mineguard^TM by its developer. In addition to demonstrating exceptional rock support capabilities, this material has also been shown to be capable of significantly reducing levels of radon flux and diffusion flow occurring from highly emanating source environments. The radon impermeability characteristics of Mineguard^TM offers potential for its use in creating effective barriers to naturally-occurring radon flows which typically develop both in underground uranium and non-uranium mines. Laboratory ventilation investigations have also provided detailed information concerning Mineguard^TM material friction factor, surface roughness and airflow resistance characteristics. The evaluation of friction factor conditions was used to determine potential power and ventilation cost reduction capabilities possible to be achieved when airways may be lined with such spray-on barrier materials.

Subject Headings: Ventilation | Radiation | Friction | Excavation | Air pollution | Linings | Hydraulic roughness

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