Finite Element Analysis for the Displacement Characteristics of Loess Tunnel with Weak Surrounding Rock

Qian Zhang; Hai Xia Zhang; Jin Xing Lai

doi:10.4028/www.scientific.net/AMR.487.64

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 487Finite Element Analysis for the Displacement...

Finite Element Analysis for the Displacement Characteristics of Loess Tunnel with Weak Surrounding Rock

Abstract:

Backed up by Dayoushan loess tunnel of Xining in Qinghai province, the displacements of vault settlement, peripheral convergence, surface deformation and post-construction settlement caused by tunnel construction are numerically simulated and analyzed. First, 2-D elastic-plastic model is founded to simulate the tunnel excavation process with up and down steps method. Second, considering the rheological characteristics of loess, 2-D visco-elastic-plastic constitutive model is founded to simulate the creep deformation of rock displacement characteristics. Finally, combined with the serious collapsible feature of loess foundation in supported project, the post-construction settlements under different conditions are simulated to obtain the settlement values of tunnel vault and bottom. The results can explain the deformation laws of tunnel displacement characteristics reasonably and show the importance of foundation reinforcement measures for loess tunnel.

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Periodical:

Advanced Materials Research (Volume 487)

Pages:

64-68

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.487.64

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Online since:

March 2012

Authors:

Qian Zhang, Hai Xia Zhang, Jin Xing Lai

Keywords:

Displacement Characteristics, Elastic-Plastic Model, Loess Tunnel with Weak Surrounding Rock, Post-Construction Settlements, Visco-Elastic-Plastic Constitutive Model

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