Electromagnetic emission multi-fractal characteristic of coal and gas outburst

The EME multi-fractal dimension of coal or rock is calculated using fixed-mass method, and the multi-fractal characteristic of EME series is verified. The steep degree of multi-fractal dimension Dq-q curve of EME can reflect the varying degree of EME series which is expressed by means of ?Dq. Based on the analysis of in-situ EME series, the better consistency between the index of EME multi-fractal dimension and the criticality of coal and gas outburst is gotten, and an advanced technology for coal and gas outburst forecast is given.