According to force characteristic of top-coal body in coal face with sublevel caving,using strain-equivalent principle of Damage Mechanics,the authors set up bearing mechanical model for top-coal body within face width.

Based on key block theory,laws between multiset fissure′s distributing features and block top coal caving were disccussed.

Research on loose blasting technology for top coal;

Analysis on three feature deformation parameters and multi damage of top coal in fully mechanized caving mining;

Determination of working resistance of support under different top coal conditions;