To explore the energy dissipation of coal-rock combinations failure

uniaxial compression experiments were conducted to investigate the failure process characteristics in terms of the energy. Meanwhile

the relationships of failure and acoustic emission signal were discussed based on fractal dimension. Method for evaluating the risk of rock burst was proposed

based on the investigation of the different combination structures influence on energy dissipation of coal-rock combination. The results show that when the rock height increases

the strength and elastic modulus increase

and the softening process decreases. The raise of rock height could increase the impact risk

as well as the reduction of difference between the elastic modulus of rock and coal. In addition

a new decision method was proposed based on the analyses of height and mechanical properties of coal-rock combination

compared with the “four index” of traditional fuzzy evaluation. The result of assessing the rock burst index by the decision method has higher accuracy and practicability. These results provide the data and theoretical support for further development study of rock burst risk in coal-rock combinations.