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首页> 外文期刊>Arabian Journal for Science and Engineering >Effect of the Location of Liquefiable Sand Lenses on Shallow Tunnels During Earthquake Loading
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Effect of the Location of Liquefiable Sand Lenses on Shallow Tunnels During Earthquake Loading

机译：地震荷载作用下浅隧道上可液化沙透镜位置的影响

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摘要

Loose sand lenses form due to geological processes and become saturated after a long period. The existence of such lenses around a tunnel may affect the forces and deformations in the tunnel lining. Modeling should be implemented in three spatial dimensions owing to asymmetrical conditions. Therefore, with a focus on loose sand lens in dense soil, this paper evaluates the effects of sand lens liquefaction on forces and deformations of the tunnel lining and surface settlement. Considering liquefaction analysis capabilities and the asymmetrical condition of the problem, Flac-3D software was employed. The present work focuses on the effect of the liquefiable sand lens on a shallow tunnel during earthquake loadings. It was found that the location of the sand lens greatly affects the behavior of underground structures. When the asymmetrical deformations and distortion of the tunnel lining are considered, the ratio of the dynamic state moment to the static state moment increases with the ratio of the sand lens distance to the tunnel diameter, and surface displacement decreases with increasing depth of the sand lens.
机译：松散的沙透镜是由于地质过程而形成的，经过长时间后会变得饱和。在隧道周围存在这种透镜可能会影响隧道衬砌中的力和变形。由于不对称条件，建模应在三个空间维度上进行。因此，针对稠密土壤中疏松的沙透镜，本文评估了沙透镜液化对隧道衬砌力和变形以及地表沉降的影响。考虑到液化分析能力和问题的不对称条件，采用了Flac-3D软件。目前的工作集中在地震荷载作用下浅隧道上可液化沙粒的作用。发现沙透镜的位置极大地影响了地下结构的行为。当考虑隧道衬砌的不对称变形和变形时，动矩与静矩之比随砂透镜距离与隧道直径之比增加，而表面位移随砂透镜深度的增加而减小。

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