Abstract：Many tunnels have been constructed in phyllite rock and the displacement criteria in safety control for phyllite tunnels has become an urgent problem to be solved. The Dujiashan tunnel of Guang(Yuan)—Gan(Su) expressway passing through the Wenchuan earthquake zone was studied. The deformation under different buried depths，construction methods and supporting parameters in broken phyllite of grade V was studied with indoor model tests and field tests. The results indicated that the depth influenced the tunnel deformation more than the construction methods and the supporting pattern did. The vault settlement was considered as the main control indicator，and the line cracking was considered as the symbol of stability of the broken phyllite tunnel. The field dada was analyzed statistically. A displacement criteria of safety control during the construction under the conditions of the buried depth＜300 m，three benches(reserved core soil) and supporting pattern of F3–F5 in broken phyllite tunnel was established.
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2016, Vol. 35 
