Abstract: The deformation of the surrounding rock of the layered extraction roadway is severe, so it is so difficult to maintain the stability of roadway. The mechanical model of basic roof arc triangle block based on the analysis of the activity rules of the layered extraction roadway. The mechanical model is applied to do some research on the reasonable position arrangement of layered roadway along with the numerical simulation analysis. Take the supporting of Nan'aosi mine for instance, the high water quick-setting material is used to roof grouting so as to reinforce the broken zone. The hydraulic expansion bolt and rebar anchor are applied to the roof and the both sides respectively. The research results manifest that,the new technology in this paper can improve the integrity and the mechanical parameters of the broken surrounding rock. In addition, it is make the bearing capacity of surrounding rock strengthened and the deformation of surrounding rock controlled effectively, obtain the expected technical and economic effect.

Key words: Arc triangle block, Mechanical model, Layered extraction roadway, The hydraulic expansion bolt