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Reduction of surface subsidence risk by fly ash exploitation as filling material in deep mining areas

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Abstract

The possibility of filling empty underground spaces, which exist owing to the extraction of mineral raw materials, with fly ash and cement fly ash mixes has been studied for the purpose of reducing the impact of deep mining on the surface. The method of physical modelling was used to study the behaviour of fly ash mixes deposited in extracted mine spaces. The models were constructed for two different geometries of underground extracted mine spaces: into cavities of the type of large slits created in the course of mining in steeply lode deposits without subsequently filling the empty space and in vertical shafts of rectangular or circular cross-section with horizontal side headings that have partly caved in due to mine shocks or other seismic events.

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Authors and Affiliations

  1. Institute of Rock Structure and Mechanics, Academy of Sciences of the Czech Republic, V Holešovičkách 41, 182 09, Prague 8, Czech Republic

    Trčková Jiřina & Šperl Jan

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  1. Trčková Jiřina
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  2. Šperl Jan
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Correspondence to Trčková Jiřina.

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Jiřina, T., Jan, Š. Reduction of surface subsidence risk by fly ash exploitation as filling material in deep mining areas. Nat Hazards 53, 251–258 (2010). https://doi.org/10.1007/s11069-009-9425-9

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  • DOI: https://doi.org/10.1007/s11069-009-9425-9

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