A large deformation finite element analysis of uplift behaviour for helical anchor in spatially variable clay
A large deformation finite element analysis of uplift behaviour for helical anchor in spatially variable clay
复制标题
空间变化粘土中螺旋锚杆举升行为的大变形有限元分析
DOI：
10.1016/j.compgeo.2021.104542
复制
发表时间：
2022-01
影响因子：
5.3
通讯作者：
Jiang Tao Yi
中科院分区：
文献类型：
--
作者：
Po Cheng;Yong Liu;Yu Ping Li;Jiang Tao Yi
螺旋锚正在成为一种创新的基础设计选择，用于海上应用，以抵抗隆起载荷。采用现场试验、模型试验和数值分析等方法，对粘土中不同螺旋承载板构型下螺旋锚的上拔行为进行了大量研究。然而，它们几乎都局限于确定性分析，忽略了土壤固有空间变异性的影响。本文通过三维大变形随机有限元分析，研究了空间变黏土中螺旋锚的上拔行为。采用的三维非平稳随机场同时反映了随机趋势和确定性趋势。研究发现，土体强度的空间变异性对螺旋锚杆的破坏机制有显著影响。参数化研究表明，土体强度变异系数和竖向波动尺度对承载力的影响较大，而水平波动尺度对承载力的影响较小。概率分布的拟合优度检验表明随机提升能力服从对数正态分布，由此建立了安全系数与失效概率之间的关系。研究结果可为螺旋锚的安全设计提供参考。
Helical anchors are emerging as an innovative foundation design option for offshore applications to resist uplift loading. Numerous studies have been conducted to investigate the uplift behaviour of helical anchor under different helical bearing plate configurations in clay, using field or model tests and numerical analyses. However, almost all of them are limited to deterministic analyses, ignoring the influence of inherent spatial variability of soil. This work conducts a 3D large deformation random finite element analysis to examine the uplift behaviour of helical anchor in spatially variable clay. Both the stochastic and deterministic trends are reflected in the 3D non-stationary random field adopted. It is found that the spatial variability of soil strength significantly influences the failure mechanism of helical anchor. Parametric studies indicate that the coefficient of variation and vertical scales of fluctuation of soil strength can much influence on the uplift capacity, while the effect of horizontal scales of fluctuation is trivial. The goodness-of-fit test of probability distribution suggests that random uplift capacities follow log-normal distribution, whereby the relationship between factor of safety and probability of failure is established. The findings of this paper might facilitate the safety design of helical anchor.
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DOI：
10.1061/(asce)1090-0241(2003)129:3(243
发表时间：
2003-03
影响因子：
3.9
作者：
R. Merifield;A. Lyamin;S. Sloan;Hai-Sui Yu
通讯作者：
R. Merifield;A. Lyamin;S. Sloan;Hai-Sui Yu
影响因子：
5.3
作者：
T. Charlton;M. Rouainia
通讯作者：
T. Charlton;M. Rouainia
影响因子：
2.2
作者：
S. Ullah;Yuxia Hu
通讯作者：
S. Ullah;Yuxia Hu
粘土中 XCC 桩绕轴设置的数值模拟
影响因子：
3.2
作者：
Liu Fei;Yi Jiangtao;Cheng Po;Yao Kai
通讯作者：
Yao Kai
影响因子：
5.8
作者：
Liu, Y.;Lee, F. -H.;Yi, J. -T.
通讯作者：
Yi, J. -T.