Application of combined supporting technique for composite roof;

Aiming at instability of coal seam and surrounding rock of gob-side entry driving with small pillar,combined supporting with bolt-mesh-cable is applied.

In fouth cola mine of Hebi coal power stock company,roadway of neighbouring goaf bear a large pressure,maintenance is very difficult ,it affects safety production,in order to solve this problem,this coal mine co-operates with jiaozuo university of engiveering,combined supporting technology of gob-side entry driving have been studied through test in 2118 2614 workface tood results are gained.

Analysis on results of combined support system with bolt,beam,steel mesh and anchor applied to large cross section mining gateway;

Instability analysis and the treatment of the combined support of the soil nail with the anchor;

Experience in combined supporting for use in large-span underground chamber under soft roof strata

The mechanical working mechanism research on the united supporting of prestressed soil anchor and soil nailing;

Application of the technology of the prestressed anchor and soil nailing united supporting in deep foundation pit;

After a simplified mechanics model for the internal force and deformation of the united supporting of bolt-shotcrete and steel arch has been put forward with the aid of the shell theory, the differential equations of the united supporting structure are derived, and the calculation formulas of its internal force and deformation are proposed.