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《Chinese Journal of Underground Space and Engineering》 2009-02
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Exploring the Safety Factors of Unlined Loess Tunnel by ANSYS

QIU Chen-yu,ZHENG Ying-ren,SONG Ya-kun(Department of Civil Engineering,Logistical Engineering University,Chongqing 400041,P.R.China)  
Through analyzing the failure mechanism of loess tunnel,applying the idea of strength reduction finite element method,the definition of shear safety factor and tensile safety factor can be got during the stability analysis of loess tunnel.With the c-tanφ reduction,the plastic zones of rock mass keep expanding.When the value of the nodal displacement or plastic strain has a big jump compared with that before failure,this means that the loess tunnel reaches shear failure,the reduction factor is just the shear safety factor.With the tensile reduction,loess tunnel reaches tensile failure when the first element of rock mass around loess tunnel free face fails in tension except for the bottom free face.The reduction factor is just the tensile safety factor.In order to ensure the safety of loess tunnel,two kinds of safety factors should be calculated when it is designed.
【CateGory Index】: U451.4
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