Effects of Principal Stress Rotation on the Cumulative Deformation of Normally Consolidated Soft Clay under Subway Traffic Loading
Effects of Principal Stress Rotation on the Cumulative Deformation of Normally Consolidated Soft Clay under Subway Traffic Loading
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DOI：
10.1061/(asce)gt.1943-5606.0001069
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发表时间：
2014-04
影响因子：
3.9
通讯作者：
Junhua Xiao;C. Juang;Kai Wei;Shiqing Xu
中科院分区：
文献类型：
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作者：
Junhua Xiao;C. Juang;Kai Wei;Shiqing Xu
摘要作者研究了主应力旋转（PSR）对软土中地铁交通荷载引起的沉降的影响。在这里，对正常固结的中等塑性软粘土进行了一系列带有和不带有主应力旋转的空心圆柱体试验，并进行了有限元建模和模拟。结果表明，当存在并模拟 PSR 时，正常固结软粘土的超孔隙水压力和累积变形均显着增加，并且随着最大有效主应力比或载荷频率的增加，这种影响变得更加明显。在地铁隧道下方地基土的实际交通荷载诱导应力下，PSR的存在使软粘土的累积变形比无PSR的软粘土累积变形增加了9%~23%。作为近似值，可以通过乘以无 PSR 的重复三轴试验得出的变形来估计受 PSR 影响的软粘土的累积变形...
AbstractThe authors investigated the effects of principal stress rotation (PSR) on the traffic load–induced settlement of subways in soft subsoil. Here, a series of hollow cylinder tests on normally consolidated, medium-plasticity soft clay with and without principal stress rotation were performed along with finite-element modeling and simulation. The results show significant increases in both excess pore-water pressure and cumulative deformation of the normally consolidated soft clay when PSR is present and simulated, and the effects become more pronounced as the maximum effective principal stress ratio or load frequency increases. Under the actual traffic load–induced stress in subsoil below the subway tunnel, the presence of PSR increases the cumulative deformation of soft clay by 9–23% compared with that without PSR. As an approximation, the cumulative deformation of soft clay with the effect of PSR can be estimated by multiplying the deformation derived from the repeated triaxial testing without PSR ...