Overall understanding of the factors for inelastic behaviour of geomaterial and their interactions

全面了解岩土材料非弹性行为的因素及其相互作用

• 批准号: 18360231
• 负责人: TATSUOKA Fumio
• 金额: $ 10.18万
• 依托单位: Tokyo University of Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18360231/
• 关键词: geomaterials; clay; gravel; viscosity; creep; aging effect; Triaxial compression test; three component model; 塑性; 弾性; 粒状体

Factors, viscosity, inviscid cyclic loading effect and ageing, which affect the stress-strain behaviour of geomaterial (i.e., clays, sands, gravels, cement-mixed soils, geosynthetic reinforcement, EPS etc.) as well as interactions of these factors with elasto-plastic properties were investigated by performing a great amount of drained plane strain and triaxial compression tests and direct shear tests. A general constitutive model that can simulate the above and can be used in numerical analysis of geotechnical boundary-value problems was developed. The major findings include the followings. Firstly, the geomaterial exhibits different viscosity types depending on particle shape and grading, categorized as 1) Isotach, 2) Combined, 3) TESRA and 4) Positive and Negative (P&N). Isotach is characterized by an increase in the strength with strain rate, while TESRA by the same strength in monotonic loading at different but constant strain rates and P&N by a decrease in the strength with an increase in the strain rate. These viscosity types have a positive component in that the stress increases upon a sudden increase in the strain rate and the strain increases during sustained 1

影响岩土材料应力-应变特性的因素，如粘度、无粘循环荷载效应和老化（即，粘土、砂、砾石、水泥混合土、土工合成材料加固、EPS等）并通过大量的排水平面应变试验、三轴压缩试验和直剪试验，研究了这些因素与弹塑性特性的相互作用。建立了一个能模拟上述情况并可用于岩土边值问题数值分析的通用本构模型。主要研究结果如下。首先，地质材料根据颗粒形状和分级表现出不同的粘度类型，分类为1）等速，2）组合，3）TESLA和4）正负（P&N）。等速线的特征在于强度随应变率的增加而增加，而TESRA的特征在于在不同但恒定的应变率下的单调加载中具有相同的强度，而P&N的特征在于强度随应变率的增加而降低。这些粘度类型具有正分量，因为应力在应变速率突然增加时增加，并且应变在持续1小时期间增加。

项目成果

A theoretical framework to analyse the behaviour of polymer geosynthetic reinforcement in temperature-accelerated creep tests

• DOI: 10.1680/gein.2007.14.1.23
• 发表时间: 2007-02
• 期刊: Geosynthetics International
• 影响因子: 4.5
• 作者: W. Kongkitkul;F. Tatsuoka

Viscous property of unbound granular materials in direct shear and its model simulation

未结合颗粒材料直剪粘性特性及其模型模拟

• 发表时间: 2007
• 期刊: 第42回地盤工学研究発表会 (印刷中)
• 作者: Duttine A.;Kongkitkul W.;Fujimura;S.;Kawabe;S.;Tatsuoka F.
• 通讯作者: Tatsuoka F.

Effects of reinforcement type and loading history on the deformation of reinforced sand in plane stra

加筋类型和加载历史对平面地层加筋砂变形的影响

• 发表时间: 2007
• 期刊: Soils and Foundations 47(2)
• 作者: Kongkitkul;W.;Tatsuoka;F.;Hirakawa;D.
• 通讯作者: D.

A theoretical framework to analyse the behaviour of polymer geosynthetic reinforcement in temperatu

分析聚合物土工合成材料加固在温度下的行为的理论框架

• 发表时间: 2007
• 期刊: Geosynthetics International 13(1)
• 作者: Kongkitkul;W.;Tatsuoka;F.
• 通讯作者: F.

Creep rupture curve for simultaneous deformation and degradation

同时变形和退化的蠕变断裂曲线

• 发表时间: 2007
• 期刊: Geosynthetics International (Journal of the IGS) Vol.14,No.4(掲載決定していますが、不明)
• 作者: Kongkitkul;W.;Tatsuoka;F.;Hirakawa;D.
• 通讯作者: D.