| This paper based on discussion of the research present status that the tunnel structure stabilization, obtained from the tunnel adjacent formation pressure introduced the adjacent formation initial stress condition as well as the adjacent formation loose pressure definite method. Through mechanics analysis which mutually affects to support structure the structure and the adjacent formation, has established the adjacent formation and support structure the structure state of equilibrium. Then, representing the tunnel structure numerical simulation methods and the analyzing course of the finite element, and analyzing ANSYS application at the imitation of the tunnel construction. Based on Mo Zi Tan–No.III tunnel engineering of the Liu Qian highway in An Hui Province, establishing the tunnel calculation model by ANSYS, using the elastic–plastic method and yield criterion of Mohr-Coulomb to simulate the cutting and supporting on cross-section ZK58+210 of this tunnel, obtained motion stress graph of each cutting step and the changing regular of motion stress about the cutting fore and after.The results for a practical project showed the validity of the model and the numerical method , the combination construction model composed by plan stress and beam concomitance with those parameter choose by author can worked on the stress and distortion during the tunnel excavation and lining well. At the same time, extracti- ng the construction technical version and the attention things about Mo Zi Tan tunnel and supplying the credibility theory accordion of the safe tunnel construction, and will direct the likeness tunnel construction will have good references.
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