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    Seismic Stability of Circular Tunnels in Anisotropic Granular Soil with Surcharge Loading Based on the Modified Pseudodynamic Approach

    Source: International Journal of Geomechanics:;2024:;Volume ( 024 ):;issue: 005::page 04024053-1
    Author:
    G. Gowtham
    ,
    Jagdish Prasad Sahoo
    DOI: 10.1061/IJGNAI.GMENG-9293
    Publisher: ASCE
    Abstract: This study evaluated the stability of circular tunnels constructed in anisotropic granular soil in the presence of surcharges on the ground surface and seismic loads. The stability problem was solved using the lower bound limit analysis method in conjunction with the finite-element technique. In addition, the modified pseudodynamic technique was employed, which permits seismic accelerations to vary with depth and time, including the impact of amplitude and phase differences between shear and primary waves. The forces exerted by the soil on the tunnel lining vary over the perimeter. Therefore, the ultimate support pressure should at least be equal to the maximum normal stress from the earth surrounding the tunnel. It was discovered that parameters such as the tunnel cover depth, tunnel diameter, magnitude of surcharge, soil friction angle and its degree of anisotropy, seismic acceleration coefficients, period, and frequency of seismic waves determine the support pressure’s magnitude and location. The influence of surcharge diminished beyond a certain cover depth and diameter ratio for given soil and seismic wave parameter magnitudes. This study showed that the maximum normal stress was 8.5 times greater than the uniform stress distribution. Furthermore, the support pressure was found to be a maximum of about 45.5% higher for a tunnel cover depth-to-diameter ratio of 3 than for 1%, 34% higher for anisotropy than for isotropic case, 25% higher in the presence of ground surcharge than its absence, and 60% higher for the horizontal acceleration coefficient of 0.3 compared to the static case.
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      Seismic Stability of Circular Tunnels in Anisotropic Granular Soil with Surcharge Loading Based on the Modified Pseudodynamic Approach

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4297125
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    contributor authorG. Gowtham
    contributor authorJagdish Prasad Sahoo
    date accessioned2024-04-27T22:37:56Z
    date available2024-04-27T22:37:56Z
    date issued2024/05/01
    identifier other10.1061-IJGNAI.GMENG-9293.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4297125
    description abstractThis study evaluated the stability of circular tunnels constructed in anisotropic granular soil in the presence of surcharges on the ground surface and seismic loads. The stability problem was solved using the lower bound limit analysis method in conjunction with the finite-element technique. In addition, the modified pseudodynamic technique was employed, which permits seismic accelerations to vary with depth and time, including the impact of amplitude and phase differences between shear and primary waves. The forces exerted by the soil on the tunnel lining vary over the perimeter. Therefore, the ultimate support pressure should at least be equal to the maximum normal stress from the earth surrounding the tunnel. It was discovered that parameters such as the tunnel cover depth, tunnel diameter, magnitude of surcharge, soil friction angle and its degree of anisotropy, seismic acceleration coefficients, period, and frequency of seismic waves determine the support pressure’s magnitude and location. The influence of surcharge diminished beyond a certain cover depth and diameter ratio for given soil and seismic wave parameter magnitudes. This study showed that the maximum normal stress was 8.5 times greater than the uniform stress distribution. Furthermore, the support pressure was found to be a maximum of about 45.5% higher for a tunnel cover depth-to-diameter ratio of 3 than for 1%, 34% higher for anisotropy than for isotropic case, 25% higher in the presence of ground surcharge than its absence, and 60% higher for the horizontal acceleration coefficient of 0.3 compared to the static case.
    publisherASCE
    titleSeismic Stability of Circular Tunnels in Anisotropic Granular Soil with Surcharge Loading Based on the Modified Pseudodynamic Approach
    typeJournal Article
    journal volume24
    journal issue5
    journal titleInternational Journal of Geomechanics
    identifier doi10.1061/IJGNAI.GMENG-9293
    journal fristpage04024053-1
    journal lastpage04024053-18
    page18
    treeInternational Journal of Geomechanics:;2024:;Volume ( 024 ):;issue: 005
    contenttypeFulltext
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