Influence of Tunnel Cross-section on Stability of Jurassic 4^# Coal Seam Excavation Roadway in Dongsheng Mine

In view of the problem that the tunneling roadway in Dongsheng Mine Jurassic 4^# coal seam needs to remain top and bottom coal to maintain stability of roadway under ordinary anchor net supporting condition, taking subsidiary transport gateway in Shuangxin Coal Mine 414108 working face as the engineering background, with the integrated use of theoretical analysis, numerical simulation and field measurement method, we study and analyze the instability causes of roadway surrounding rock under the original tunnel cross-section, and determine that using section form to calculate reasonable section parameters to solve the problem of tunneling roadway caving. The results show that the deformation conditions of different sections present the change process of fast change - slow change - stable change; the deformation of straight wall semicircle arch is samaller than that of original rectangular roadway; changing roadway cross section to arch section in the caving zone can improve the long-term stability of surrounding rock.