Based on the characteristics of rock deformation around roadway under mining influence, the regularity of resistance change of point and fullyanchoraged rockbolts in the process of deformation and damage of rocks is investigated.

The spot observation research on the surrounding-rock deformation laws of roadway in fully-mechanized sub-level caving mining face;

Research on Destruction Mechanism and Supporting in Roadway of the Steep Coal Seam of Taiping Coal Mine;

The roadway deformation mechanism and establishment of mechanical model of thick seam

Stability analysis of the mining roadways with bolt supporting;

Study on the strata and fracture features of surrounding rocks and the bolting effect in actual mining roadways;

Theoretical determination of bolt pre-tightening force on the bolt combined effect in the roof of mining roadway

Coupling support technology with bolt/steel mesh/anchor for deep mining gateway in Jining No.2 Mine;

Practices on floor heave prevention and control technology of mining gateway in Wuyang Mine;

Practices on bolt support for mining gateway under geological conditions of broken surrounding rocks;

Influenced of coal pillar width on deformation and fracture of gateway surrounding rocks in fully mechanized top-coal caving mining;

Numerical simulation on stability of gateway under the influence of the thickness of immediate roof;

Study on taking shotcrete precautions against gateway fire in fully mechanized mining with sublevel caving;