Study the feasibility of the bolt support technology used in deep dip angle half-coal rock roadway in this paper,and analysis the effect on roadway's rock stress distribution and condition of maintenance when the vertex angle coal hold,finally,a bolting support design is suggested,and the research results have been applied to the project successfully.

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;

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.

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.