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Elasto-viscoplastic Finite Element Analysis of the Installation Time of a Secondary Lining
1 School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070
2 Key Laboratory of Road & Bridge and Underground Engineering of Gansu Province, Lanzhou 730070
3 China Railway Northwest Research Institute Co., Ltd, Lanzhou 730000
Abstract Based on the actual condition of large deformation in soft rock tunnels on the Lanzhou-Chongqing railway, a simulation analysis by elasto-viscoplastic finite element was performed regarding the installation of a secondary lining when the deformation rate reached 2mm/d (the maximum compression stress in the secondary lining was 20.25MPa and the maximum tensile stress was 1.68MPa). The results indicate that strength failure will not occur to the lining if a C35 reinforced concrete lining is installed when the deformation rate is 2mm/d.
Abstract：
Based on the actual condition of large deformation in soft rock tunnels on the Lanzhou-Chongqing railway, a simulation analysis by elasto-viscoplastic finite element was performed regarding the installation of a secondary lining when the deformation rate reached 2mm/d (the maximum compression stress in the secondary lining was 20.25MPa and the maximum tensile stress was 1.68MPa). The results indicate that strength failure will not occur to the lining if a C35 reinforced concrete lining is installed when the deformation rate is 2mm/d.
2012, Vol. 49 