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Constitutive models for geomaterials considering induced anisotropy and density of soils and their application, to bearing capacity problems of foundation under various loading conditions

考虑诱发各向异性和土壤密度的岩土材料本构模型及其在不同荷载条件下地基承载力问题中的应用

基本信息

批准号：
12650492
负责人：
NAKAI Teruo
金额：
$ 2.3万
依托单位：
Nagoya Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650492/
关键词：
sand clay constitutive model anisotropy density bearing capacity FEM model test モデル実験

项目摘要

New isotropic hardening and kinematic hardening elastoplastic models for sand and clay, which are named subloading tij-model and kinematic subloading tij-model respectively, are developed, referring to the previous models based on tij concept. In these models, the influence of density and confining pressure on the deformation and strength of soils are properly considered. Furthermore, Stress induced anisotropy is taken into account in the kinematic hardening model. The validity of proposed models is checked using the experimental data of triaxial compression and extension tests, true triaxial tests, plane strain tests and hollow cylinder tests on sand and clay. The results predicted by the proposed models can simulate well the stress-strain behavior and strength of sand and clay including strain softening after failure. The material parameters of these models are small in number and are not influenced by the density and confining pressure. Therefore the present models are applicable to … More the geotechnical problems in which the density of the ground materials is changed during their deformation.The constitutive models are implemented into the finite element program and applied to the analyzes of some geotechnical problems such as bearing capacity problems of shallow foundations. The behavior of shallow foundation under eccentric load, inclined loading combined loading as well as concentric loading is analyzed. The corresponding model tests of shallow foundation are also carried out with a new developed device that can impose various kinds of loads. Even though the stress levels of model tests are very low, there are good qualitative agreements between the tests results and the analytical results under various loading conditions? I.e., scale effect of bearing capacity, load settlements curves, vertical and horizontal movements of the foundation including its rotation and others. It is shown that the finite element method in which typical mechanical characteristics of geomaterial are properly taken into consideration can give realistic solutions of geotechnical problems and is a powerful tool for the practical design of geotechnics. Less

借鉴已有的基于Tij概念的各向同性硬化和运动硬化弹塑性模型，建立了砂土和粘土的各向同性硬化和运动硬化弹塑性模型，分别命名为Tij模型和运动子加载Tij模型。在这些模型中，适当地考虑了密度和围压对土体变形和强度的影响。此外，在运动硬化模型中考虑了应力诱发的各向异性。利用砂土和粘土的三轴压缩和拉伸试验、真三轴试验、平面应变试验和中空圆筒试验数据对所提出的模型进行了验证。该模型的预测结果能较好地模拟砂土和粘土的应力-应变行为和强度，包括破坏后的应变软化。这些模型的材料参数个数较少，不受密度和围压的影响。因此，本模型适用于…将本构模型应用到有限元程序中，并将其应用于一些岩土问题的分析，如浅基础的承载能力问题。分析了浅基础在偏心荷载、倾斜荷载、复合荷载和同心荷载作用下的受力性能。利用新研制的可施加多种荷载的装置，进行了相应的浅基础模型试验。尽管模型试验的应力水平很低，但在各种加载条件下，试验结果与分析结果之间有很好的定性一致性。即承载能力的尺度效应、荷载沉降曲线、地基的竖向和水平运动(包括其旋转等)。结果表明，适当考虑岩土材料典型力学特性的有限元方法能较好地解决岩土工程问题，是岩土工程实际设计的有力工具。较少