OBSERVED BEHAVIOUR OF A TUNNEL IN SAND SUBJECTED TO SHEAR DEFORMATION IN A CENTRIFUGE
OBSERVED BEHAVIOUR OF A TUNNEL IN SAND SUBJECTED TO SHEAR DEFORMATION IN A CENTRIFUGE
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DOI：
10.3208/sandf.50.281
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发表时间：
2010-04
影响因子：
3.7
通讯作者：
S. Shibayama;J. Izawa;A. Takahashi;J. Takemura;O. Kusakabe
中科院分区：
文献类型：
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作者：
S. Shibayama;J. Izawa;A. Takahashi;J. Takemura;O. Kusakabe
本文介绍了一个模型隧道埋在干砂在离心机中进行循环地面剪切变形的观察行为，以及剪切变形过程中的模型地面的行为。给出了地表剪切变形时作用在隧道衬砌上的土压力和衬砌截面力的详细数据。结果表明，地表剪切变形前隧道拱顶土压力小于全覆土压力，这可能是由于拱效应的形成，而随着地表剪切变形的循环，拱效应可能会恶化，导致拱顶土压力增大，截面力分布发生变化，这在很大程度上受隧道衬砌与仰拱之间的条件影响。
The paper describes observed behaviour of a model tunnel embedded in dry sand subjected to cyclic ground shear deformation in a centrifuge, as well as the behaviour of the model ground during shear deformation. Detailed data on earth pressures acting on the tunnel lining and the sectional forces of the lining are presented during ground shear deformation. The data suggest that the earth pressure at tunnel crown before ground shear deformation is smaller than the full overburden pressure probably due to the formation of arch action and the arch action may deteriorate with the cyclic ground shear deformation, resulting in an increase in the earth pressure at crown and changing the distribution of the sectional forces, which are largely influenced by conditions between tunnel lining and invert.