Stress concentration due to overlying strata weight on pillar will make downward coal seam mining difficult.

To solve the difficulties of mining the coal seams underlie the-115 main entry without destroying the main entry in the Quangou coal mine,the simulation analysis of surrounding rock movement regularities of the main roadway with the underlie coal seams mined was carried out.

Study on structural stability of deep buried highway tunnel with underlying coal bed exploiting;

This paper introduces the working principles of high density resistivity method and the field work method,probes into some problems that should pay attention to in detecting the multi-layer goaf by using the high density resistivity method,and expounds the concrete steps of detecting the multi-layer goaf of underground coal seam.

Measures for preventing and controlling gas in deep coal bed;

The deep coal bed in Xingbei is one of the best targets to exploit availably with large reserve and medium burial depth.

In the paper,the mechanical mechanism of gas Emission is revealed by the force analysis of surrounding coal of deep vertical shaft and the research on ground pressure and gas pressure during vertical shaft crossing deep coal bed.