Supporting numerical simulation of roadway surrounding rock in deep high stress based on broken-expand deformation

According to large deformation and supporting problem of roadway surrounding rock under deep high stress caused by broken-expand deformation, supporting numerical simulation and optimization on a roadway were studied. Two primary support scheme of medium length anchor with self-drilling anchor and short pre-stressed anchor with self-drilling anchor and three secondary support scheme of 5m, 6m and 7m length cable were proposed based on roadway engineering characteristics; Calculation parameters of support structure parameters and surrounding rock were determined based on broken-expand deformation mechanism, and scheme were calculated respectively; Deformation, plastic zone and stable state of surrounding rock under different support were analyzed based on results individually, and optimal support scheme were opted. The results showed that roadway used 5.5 similar to 6.0m anchor cable as secondary support whose stability factor can be achieved 1.28 could meet productive requirement.