This method with a simple production system,is of lower cost But problems such as methods of tunnel support and feedback and expanding roadway,and designs of ratio of extraction to reservation,should be still studied in the extraction through tunnel.

Study on observations on underground pressure of special thick seam at full seam gateway in high stress area;

The deformation feature of deep shaft coal roadway is analyzed,and the reason for many kinds of support failures is studied.

The phenomenon of underground pressure and principle of surrounding rock control of deep shaft coal roadway are introduced.