An elasto-plastic interpretation on mechanical properties of natural deposited clays

天然沉积粘土力学性能的弹塑性解释

• 批准号: 15360251
• 负责人: NAKANO Masaki
• 金额: $ 3.65万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15360251/
• 关键词: Clay; Soil Structure; Consolidation; Overconsolidation; Anisotropy; Elasto-plastic equation

Undrained triaxial compression tests and oedometer tests were carried out on two types of naturally deposited undisturbed clay, Pleistocene clay and Holocene clay, and the behaviors of these clays were then simulated using the Super/subloading Yield Surface Cam-clay model (Asaoka, Nakano and Noda,1998,2000 and Asaoka et al.,2002), in which the concepts of "structure," overconsolidation, anisotropy, and their evolution laws, are introduced into the modified Cam-clay model. The findings of the present study are as follows :1)For the two types of undisturbed clay, the Super/subloading Yield Surface Cam-clay model can simulate undrained triaxial compression behaviors ranging from the normally consolidated state to the overconsolidated state, corresponding to various isotropic pressures using a single set of material constants.2)In addition, the model can simulate one-dimensional compression behaviors using the same material constants as those used for the undrained triaxial compression behavior simulation.3)Both undrained shear and one-dimensional compression behaviors for the two types of undisturbed clay, that is Pleistocene clay and Holocene clay, which have different loading histories and have undergone different ageing effects, were simulated using the Super/subloading Yield Surface Cam-clay model by changing the evolution parameters.

对更新世和全新世两种自然沉积的原状粘土进行了不排水三轴压缩试验和测湿仪试验，然后使用超级/次加载屈服面Cam-clay模型（Asaoka， Nakano和Noda，1998年，2000年和Asaoka等人，2002年）模拟了这些粘土的行为，其中将“结构”、超固结、各向异性及其演化规律的概念引入了改进的Cam-clay模型。研究结果表明：1)对于未受扰动的两类粘土，采用单一材料常数，采用超/次加载屈服面Cam-clay模型可以模拟不同各向同性压力下正常固结至超固结的不排水三轴压缩行为；2)此外，该模型可以使用与不排水三轴压缩行为模拟相同的材料常数来模拟一维压缩行为。3)通过改变演化参数，采用超/次加载屈服面cam -粘土模型，模拟了具有不同加载历史和不同老化作用的更新世和全新世两种原状粘土的不排水剪切和一维压缩行为。

项目成果

野田利弘他4名: "自然堆積粘土地盤の構造を劣化させつつ進行する圧密沈下挙動"第39回地盤工学研究発表会概要集(地盤工学会). (発表予定). (2004)

Toshihiro Noda 等 4 人：“固结沉降行为进展，同时恶化自然沉积粘土地基的结构”第 39 届岩土工程研究会议摘要集（日本岩土工程学会）（预定发表）。

Simulation of shear and one-dimensional compression behavior of naturally deposited clays by super/subloading yield surface Cam-clay model

• 发表时间: 2005
• 期刊: Soils and Foundations
• 影响因子: 3.7
• 作者: M. Nakano;K. Nakai;T. Noda;A. Asaoka

Elasto-plastic behavior of naturally deposited clay during/after sampling

采样期间/之后自然沉积粘土的弹塑性行为

• 发表时间: 2005
• 期刊: Soils and Foundations(地盤工学会) 45・1
• 作者: Noda;T.;Yamada;S.;Asaoka;A.
• 通讯作者: A.

A description of mechanical behavior of clay and san based on evolutions of soil structure and overconsolidation

基于土壤结构和超固结演化的粘土和砂的力学行为描述

• 期刊: First Japan-U.S.Workshop on Testing, Modeling and Simulation in Geomechanics, ASCE (印刷中)
• 作者: Nakano;M.;Nakai;K.;Asaoka;A.
• 通讯作者: A.

野田利弘他3名: "骨格構造が発達した粘土地盤の長期圧密沈下挙動に及ぼす各種要因に関する考察"第39回地盤工学研究発表会概要集(地盤工学会). (発表予定). (2004)

Toshihiro Noda等3人：“影响具有发达骨架结构的粘土地基的长期固结沉降行为的各种因素”第39届岩土工程研究会议摘要集（日本岩土工程学会）（预定报告）。 ）