ABSTRACT
In hard coal mines in Poland, the use of filling of caving is widespread. Mixtures of water and fly ash from coal combustion in power plants are used for this purpose. In addition to many other benefits, attention has been paid to this technology’s usefulness in reducing water hazards. For this purpose, laboratory tests have been undertaken on fly ash-water mixtures samples conductivity using a falling-head permeameter. The results showed that the mixtures achieve permeability values range from 8x10-7 m/s to 1,2x10-9 m/s. Additionally, caved zone structure and flow of fill mixtures in longwall cavings have been discussed.
