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;

Site measurement analysis on top-coal movement and displacement in a lower sub-slice isolated island fully mechanized top-coal caving face;

Optimization Study of Caving Fissure of Hard Top-coal and Coal Mining Technology;

In order to control the stability of surrounding rock mass and the capability of top-coal for overlength isolated fully-mechanized top coal caving face,the distribution characters of abutment pressure for the working face are analyzed contrastingly with finite element software.

Analysis on roof coal activity rule in compound mining face;

Analyses factors that affect cover caving ability of roof coal in sublevel caving mining method.

The paper discusses the roof coal breakage principle,deformation breakage and retrieval law and analyzes factors affecting cover caving ability.

From the influencing factors,the falling capability of roof-coal is studied systematically by finite element numerical analysis and observations in-situ.

This paper studies the failure mechanism of roof-coal in abutment presure according to the basic principle about rock deformation and roct mechanics.