Shallow buried tunnels are commonly seen in engineering practice. To understand the failure mechanism of shallow buried tunnel is of significance in engineering practice. There is a reasonable judging index lacking in tunnel stability. The strength reduction method (SRM) gain limiting status of geotechnical materials by reducing the computation parameters. Then the failure zone can be obtained and showed. Finally, a safety factor can be obtained by this progress. This method has been used in slope stability analysis. The usage of this method is a new field. Based on shallow tunnel computation model under different cover depth, the SRM method is adopted in finding the safety factor of shallow buried tunnels. The displacement curve changing with the strength reduction factor is drawn and the catastrophe point is found as the safety factor. Further, by compared with the failure criteria of plastic zone connection and non-converge, also, compared with model tests, failure mechanism of shallow buried is analyzed. Specialty of these safety factors is discussed and it is proved that they maintain a accordance. This research is of significance for tunnels safety factors' study.
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