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| Numerical Analysis of Consolidation Deformation of Tunnel Foundation Under Effect of Long － term Train Load |
| ZHANG Xue － gang2 ; HUANG A － gang1 ; GUO Wang － jun2 |
| 1． Shaanxi Railway Institute，Weinan，714000，China; 2． Wuhan University of Science and Technology，Wuhan，Hubei 430070，China |
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Abstract Research purposes: The analysis is made for the dynamic response and deformation law of the foundation under the different loading quantities of train． The spatial FEM model is established in the numerical analysis． The exciting force corresponding to the irregularity management standard is adopted to simulate the train load and the M － C plastic constitutive model is used to present the load bearing characteristics of the tunnel foundation．
Research conclusions: During the the initial running of the train，the ground differential deformation along axial direction is big and the deformation change is variable． The settlements on the bottom and top of the tunnel lining trends to consistent． With the decrease of the buried depth of the tunnel，the foundation deformation increases． During loading of some times，the deformation on the middle part is big and decreases gradually along the longitudinal direction to the two ends． After long time running of the train，the deformation on the middle part increases，but its long － term effect should not ignored． Application of the plastic constitutive model can reasonably present the accumulation of foundation deformation under the effect of long － term load of the train．
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Received: 12 January 2011
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2011, Vol. 28 
