Abstract: The method for calculating the progressive failure of surrounding rocks is proposed aimed to the deformation features of deep tunnel.Finite element calculation program based on progressive failure is compiled through secondary development to ANSYS.Then calculation and analysis are carried out based on the geological data of the tunnel in the Fourth Mine belonging to the Pingdingshan Colliery Group Co.Ltd.The change process of roof stress is obtained in case of supporting and no supporting, and the bearing structure evolution is comprehensively analyzed combined with siding-walls.The calculation result shows that the supporting structure evolution has distinct durative and stage features.And the change process without supporting can be divided into adjusting process, steady process, and accelerating process.While supported, the accelerating process is transformed into steady stage, and the siding-wall is the key position of bearing structure evolution.Thus the support of deep tunnel should be optimized through the principle of dynamic process control, and reinforcing supporting should be made in those key positions, to obtain long-time stability of the deep tunnel.

Key words: Deep roadway, Bearing structure, Progressive failure, Process control, Numerical simulation