THE ENERGY COMPENSATION PRINCIPLE OF HARD COAL CRACK AND ITS APPLICATIONS
硬煤裂隙能量补偿原理与应用

The development and propagation conditions of top coal damage crack are systematically analysed in theory. The design principle and parameters of prerelaxation are used to promote the energy compensation for fissure extension in order to improve the character of top coal fall. Finally, the application effects and prospects of energy compensation principle are illustrated with two practical examples.