To provide the theorical basis for electromagnetic emission (EME) forecasting dynamic disasters of the coal or rock mass

the relations between EME energy and loading mechanical energy are analyzed preliminarily by the theory of electromagnetic wave and damage mechanics. The coupling relations between EME and energy accumulation during the deformation and failure of coal under uniaxial compression are investigated by laboratory tests and the energy theory. The results show that: the relations between loading mechanical energy and EME energy during the deformation and failure of the coal sample is positive linearity

and the ratio is 0.1074 times with elastic modulus of coal samples; the EME energy is not only proportional to peak elastic strain energy of coal

but also proportional to the impact energy index of coal. The EME signal reflected the difficulty level of the coal dynamic damage

Therefore

the EME can forecast dynamic disasters of coal or rock mass.