1g model test of piled-raft foundation subjected to vibration load and its simulation considering small confining stress

被引：0

作者：

Zhu, Wenxuan ^{[1
]}

Ye, Guanlin ^{[1
]}

Gu, Linlin ^{[2
]}

Zhang, Feng ^{[3
]}

机构：

[1] State Key Laboratory of Ocean Engineering, Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai,200240, China

[2] Department of Civil Engineering, Nanjing University of Science and Technology, Nanjing,210094, China

[3] Department of Civil Engineering, Nagoya Institute of Technology, Nagoya,4668555, Japan

来源：

Soil Dynamics and Earthquake Engineering | 2022年 / 156卷

基金：

中国国家自然科学基金;

关键词：

'Dry' [ - Clean sand - Confining stress - Elastoplastic constitutive model - Model tests - Modeling simulation - Piled raft foundation - Small confining stress - Train loads - Vibration loads;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The numerical simulations of 1 g model tests are presented to evaluate the feasibility of the proposed elasto-plastic constitutive model, which can precisely describe the less compressibility of clean sand under small confining stress. The dynamic responses of piled-raft foundations subjected to cyclic train loads were investigated by comparing the results of model tests and simulations. Different frequencies of dynamic loading and different grounds including dry loose sand, dry/saturated medium dense sand, were taken into consideration. It is confirmed that for all types of grounds and input vibration, the numerical results showed a good match with model tests data, especially the settlement and acceleration of piled-raft foundation. Both numerical simulations and experiments showed that the higher the frequency of the dynamic load is, the greater the peak acceleration will be. The proposed constitutive model has greatly improved the accuracy of the numerical simulations on the small-scale 1 g model tests because this model can accurately describe the mechanical characteristics of sand from very small confining stress to normal confining stress, especially the less compressibility and more dilative behavior of sand under small confining stress. © 2022 Elsevier Ltd

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