Fractal Research on Relation between Coalfield Geological Tectonic and Gas Outburst

The relation between geological tectonics in certain coalfields and the outburst proneness of mining areas has been analyzed in China by means of fractal geometry, and the index of tectonic fractal dimension for outburst prediction has been optimized. All of the distribution of fault and fold tectonics in coalfields of each category mining area follow the fractal law, and the influence of distribution of geological tectonic in coalfield to hazard extent of coal and gas outburst can be described using fractal dimension. There is a positive correlation between fault fractal dimension and hazard extent of outburst, and between fold fractal dimension and hazard extent of outburst. Tectonic fractal dimension summation composed of fault and fold fractal dimensions is a well index for outburst zone prediction.