Abstract：In order to find a reasonable construction scheme system for tunneling in crushing phyllite，the field tests and numerical simulations are combined to present the variation laws of the deformations around the tunnel，axis forces of anchors，contact pressures between surrounding rocks and primary support as well as between primary support and secondary lining，and the internal forces in arch frames and the secondary lining under 7 tunneling schemes. The study indicates that the schemes S1 and S2 are both unsuitable for the tunnel excavation because of the large deformation and other hazards. The excavation conditions are satisfied in scheme S3，but the supporting system should be reinforced. For schemes S4–S7，the deformations will be controlled effectively to maintain the tunnel stability. However，in addition to the heavy loads applied on the supporting system，the schemes S5 and S6 will result in numerous construction difficulties，long construction period and high cost. For scheme S7，the surrounding rocks are most frequently disturbed and the primary lining cannot be enclosed in time. For scheme S4，the deformations of the surrounding rocks can be well controlled，whilst the loads can be reduced and the supporting pressure can be provided for tunnel stability. Besides，scheme S4 can be transformed rapidly to schemes S6 and S7. It is beneficial to maintain the long-period stability of tunnels excavated in crushing phyllite or other soft rock layers.
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2013, Vol. 32 
