Deformation development characteristics of deep surrounding rock fracture circle and shallow surrounding rock in roadway
In order to comprehensively explore the surrounding rock instability problems such as the evolution of fracture cir-cle in deep surrounding rock of roadway,deformation of shallow surrounding rock and failure of mechanical structure of road-way support under disturbed conditions,taking Hancheng Coal Mine as an example,the development state of fracture circle in deep surrounding rock of roadway,deformation of shallow surrounding rock and failure characteristics of supporting struc-ture of roadway were analyzed and summarized by field test,numerical simulation and similar simulation methods.The ultra-sonic test and borehole observation show that the stress concentration caused by engineering excavation is much greater than the mechanical strength of the rock mass itself,and the loosening and failure degree of the deep surrounding rock of the roadway is much greater than that of the conventional roadway under the action of high and low stress.Numerical simulation and similar simulation show that the deformation of the shallow surrounding rock of the roadway has obvious zonal failure characteristics,which is easy to lead to the overall extrusion failure of the anchor solid.With the increase of support strength,the brittle failure of the surrounding rock of the roadway is gradually transformed from the brittle failure of tension cracks to the plastic failure mainly dominated by shear cracks,forming a discontinuous zonal failure feature of the supporting structure.According to the mechanical evolution of stope,the structural instability failure model of large structure movement-surrounding rock deterioration-plasticity,rheology-failure-rock mass expansion is proposed,providing engineering research basis for roadway support technology.
mining stresshigh ground stressroadway sur-rounding rocksurrounding rock deformationsupport struc-ture
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