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Abstract The mechanical model and parameters of rock is the basis of calculating the stability of soft rock tunnel. A visco-elastic-plastic softening model for the long-term stability analysis was established through the experiments，theoretical analysis and empirical analogy on the long-term strength of mudstone. The artificial intelligence method was used to investigate the experimental and monitored data from a project and the values of the rheological parameters of rock were obtained. The rheological model and the experimental flow curve fit well. The prediction of the long-term stability of a large-span tunnel was made. The forces in the bolt and lining were found to vary similarly to the creep characteristics of rock. The stress was increased in the initial phase，and the stress in lining was essentially unchanged after 3–5 years and the supporting structure was safe.
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2015, Vol. 34 
