Centrifuge and numerical modelling of tunnel intersected by normal fault rupture in sand
Centrifuge and numerical modelling of tunnel intersected by normal fault rupture in sand
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沙中正断层破裂相交隧道的离心机和数值模拟
DOI：
10.1016/j.compgeo.2019.03.010
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发表时间：
2019-07-01
影响因子：
5.3
通讯作者：
Chen, X. X.
中科院分区：
文献类型：
--
作者：
Cai, Q. P.;Peng, J. M.;Chen, X. X.
本研究利用离心模型试验与数值分析，探讨砂土中正断层作用下既有隧道的变形机制。由于在砂层中存在隧道，正断层引起的现有隧道上方的地表沉降显著减少（即，屏蔽效应）。这些屏蔽效果提供了现有隧道的隧道埋深降低。当在隧道中施加运动学约束的边界条件时，在隧道冠处引起的纵向应变远大于在具有自由边界条件的隧道中观察到的纵向应变。
In this study, centrifuge model tests and numerical analyses were conducted to investigate the deformation mechanisms of an existing tunnel due to normal faulting in sand. With the presence of a tunnel in sand stratum, normal faulting-induced ground surface settlements above the existing tunnel were significantly reduced (i.e., shielding effects). These shielding effects provide by the existing tunnel were decreased with the tunnel burial depth. When a kinematically constrained boundary condition was applied in the tunnel, the induced longitudinal strains at the tunnel crown were much larger than those observed in a tunnel with a free boundary condition.