Technique Research on Test of Surrounding Rock Releasing Ring in Crushing Roadway Sight Method

摘要

According to severe deformation of crossheading surrounding rock of Xinshun Mine 15102# roadway. Sight instrument method is adopted to loose circle test of crossheading surrounding rock, and study the damage range. The study result indicates that the loose circle is about 2.5m～3.0m of 15102# roadway. The loose circle of sides is about 2.4m～2.8m; belong to typical large loose circle. And roof loose circle is a little more than sides. Surrounding rock has some engineering characteristics of soft rock, leading to loose circle rock fragment and expand severely. Increase supporting difficulty. It adopts unite supporting form in the case of surrounding rock.