Research on failure mechanism and control technology of surrounding rock in mining roadway
Roadway excavation causes the stress of the roadway surrounding rock to be redistributed,and the plastic zone also continues to expand.In order to determine the deformation and damage of the roadway surrounding rock in Kunda Coal Mine to determine the roadway support plan,theoretical analysis was used to establish a stress model for circular roadways with non-uniform stress fields,and the boundary equation for the plastic zone of the surrounding rock of the circular roadway was derived.Numerical simulation of the plas-tic zone distribution of surrounding rock failure in mining roadways under the influence of mining,and proposing optimized support schemes for roadways based on the depth of plastic zone failure.Numerical simulations were conducted on the deformation of the sur-rounding rock of the roadway in both the original and optimized support schemes.It was found that the optimized support significantly re-duced the range of damage,the displacement of the roof and floor,and both sides,and controlled the deformation of the surrounding rock.Through industrial tests and inspection results,it was found that the roof subsidence increases with the advancement of the working face,and the roadway received the most severe mining impact within the range of 25～35 m from the working face.After optimizing the support,the deformation of the surrounding rock in the roadway after mining is not significant,which meets the requirements of the road-way support design,proving that the optimized support design of the working face mining roadway is scientific and reasonable.
non-uniform stress fieldnumerical simulationsurrounding rock deformationsupporting parameter optimization
万方数据
维普
