| The question of solid mechanics is nonlinear substantially．Ingeotechnical engineering,the stress and deformation of structurecould be reflected more truly through nonlinear theory and method． The deformation and movement of soft rock tunnel has importantaffection to the stability of structure．Whether we can caculate andimitate the fluid change character of surrounding rock or not,whichhas more important meaning in selecting the project of timbering andcontrol． The three dimensional emulation and caculation is an importantmethod in modeling the stress and deformation of the spatialstructure．It is more objective,accurate and imaginable in relationto the method that simplity the structure into plane model． In the paper,the author built the three dimensional nonlinearmodel of a soft rock tunnel and analyzed its fluid change characterthrough the theory of nonlinear finite element．The author emulatedand analyzed the structure by the large general purpose finiteelement analysis software ANSYS5．6,in postprocess,the results ofanalysis were displayed by many ways．The author also improved themodel to analyze it in relation to the former and drew someconclusion．...
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