Application of unloading and loading method in measuring bursting energy index

In order to measure the bursting energy index K_E of coal-rock samples, the method of unloading and loading was exploited and an experimental unit was designed based on it without loop electric-hydraulic servo-controlled fatigue testing machine and stiffness test machine.With this device, the bursting energy index K_E of samples collected from a coal mine of Tonghua Mining Administration was measured.The stress and strain curve was drawn according to experimental data, and it demonstrated the feasibility of the method of unloading and loading.In combination with elastic energy index W_ET, dynamic fracture duration DT and uniaxial compressive strength R_c, the rock burst of related mine would be judged.