Study on cross-section shape and excavation scheme of transportation roadway in Haishiwan coal mine

摘要

The affect of cross-section shape and excavation scheme of transportation roadway on the stability of surrounding rocks are analyzed by means of numerical simulation. The results show that: (1) The three centered arch section is better matched to the principal stress vector field and the surrounding rocks of three centered arch section roadway is much more stable than that of semicircle arch section roadway. (2) The double step excavation scheme of roadway is better than the full face excavation scheme.