The numerical calculation verified the feasibility of numerical modeling of stability of compressive bar using FLAC3D, and the influence of the background ambient horizontal stress and the parameters of the contact surface to the roof stability were further studied. The critical pressure for roof stability and roof bending moment and deflection under combined axial and lateral load was deduced using the theory of compressive bar stability. The model has been tested and verified on accuracy and feasibility while applied on a roadway case. We have founded a critical pressure calculation model, on the theory of compressive bar, for the rectangle coal roadway stability. The analysis of roof stability is mainly based on numerical calculation and on-site observation, while the basic theory of the bearing mechanism is relatively weak. The roadway roof is a key factor to the roadway stability.
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