深部过断层巷道围岩稳定性及控制技术研究OA

The 14321 working face of Gubei Coal Mine has a large burial depth,high ground stress,well-developed fractures,and the surrounding rock of the roadway is difficult to control.To address the support challenges of the 14321 ventilation roadway passing through a fracture fracture zone,this study conducted a mechanical analysis of roof bending deformation.The maximum roof deflection and fracture zone width were calculated,with results corroborated by numerical simulations.Using the FLAC3D numerical simulation method,the entire process of the roadway traversing the fracture and the surrounding rock response was simulated.The analysis focused on the dynamic evolution of the advanced abutment stress,plastic zone,and displacement field within 10 meters ahead of and behind the F14321-1 fracture.The results indicate that:(1)The peak value of the working face's advanced abutment stress initially increases and then decreases;(2)In the section 10 to 5 meters from the fracture,the plastic zone range in the roadway ribs is larger than that in the roof and floor;(3)When excavation reaches 5 meters from the fracture,the degree of plastic failure in the roof and floor significantly intensifies;(4)During fracture crossing,the convergence of the ribs consistently exceeds that of the roof and floor,with a sudden change in surrounding rock convergence occurring at the fracture,where the increase in roof displacement is most pronounced.Following the implementation of combined bolt-mesh-cable support,roadway roof subsidence decreased by 34 mm,rib convergence reduced by 21 mm,and floor heave decreased by 44 mm.This confirms the effectiveness of this support system in controlling surrounding rock deformation and ensuring the stability control of the roadway traversing the fracture.