Stability analysis of vertical shaft surrounding rock and supporting system in deep fault fracture

The Convergence-Constraint method was applicated to the stability analysis of shaft supporting structure in Coal Mine. Through the investigation and numerical simulation method, it was calculated the ground reaction curves and longitudinal deformation profile by Hoek-Brown criterion. Combined with the parameters of supporting structural, drawing the support characteristic curves, analysis of the interaction in surrounding rock and supporting structure, the failure mechanism of supporting structure in the shaft was revealed. Introducing the idea of high strength prestressed anchor for high resistance before pressure allowing, through the establishment of three-dimensional numerical model to calculate the interaction curves in surrounding rock and support structure, a reasonable release amount of rock displacement was determined to guide the secondary support retaining of time. The results show that the results of Hoek-Brown model is in consistent with the actual situation, Convergence-Constraint method can more intuitively evaluate support system stability. The proposed design in the actual application achieved the desired effect.