Cyclic behavior of clay during great earthquake and its consititutive model

大震过程中粘土的循环行为及其本构模型

• 批准号: 09650545
• 负责人: OKA Fusao
• 金额: $ 2.18万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650545/
• 关键词: constitutive model; viscoplasticity; viscoelasticity; liquefaction; earthquake; kinematic hardening; cohesive soil; cyclic loading; 繰り返し構成式; 粘弾-粘塑性; 地震地震災官; 弾粘塑性; 地盤災害; 非線形移動硬化則

Liquefaction has been recognized as an important factor of ground damage due to 1995 Hyogoken Nambu Earthquake. It is well known that soft clay sediment are deposited around Japanese urban area such as Osaka city. In order to accurately clarify the ability of the earthquake resistance of ground, it is necessary to clarify the dynamic behavior of soft clay deposit due to the great earthquake such as Hyogoken Nambu Earthquake which is magnitude 7 in Richter scale.For this reason, the present study focuses on the modeling of dynamic behavior of clay. The model proposed is applicable to the behaviors both at small strain around 1% and at the large strain more than 10%. For this purpose, cyclic triaxial and torsional tests have been performed on clay. Based on the experimental results, a cyclic viscoplastic constitutive model has been developed using the non-linear kinematic hardening rule. In the study, a viscoelastic- viscoplastic model has been newly proposed in order to describe energy dissipation chracteristics in high frequency domain at a small strain. Finally, by the one-dimensional simulation with the observed acceleration records at Port Island during the 1995 Hyogoken-Nambu Earthquake, the effect of viscoelastic and viscoplastic property of clay on the of dynamic behavior of ground including clay layers is studied.

液化已被认为是由于1995年的Nambu地震而造成的地面损害的重要因素。众所周知，柔软的粘土沉积物是在大阪市等日本市区周围存放的。为了准确阐明地震的地震抵抗力的能力，有必要阐明由于大地震的巨大地震而引起的软粘土沉积物的动态行为，例如hyogoken nambu地震，这是里奇特量表中7幅度7的幅度。出于这一原因，本研究的重点是粘土的动态行为。所提出的模型适用于在1％左右的小菌株和大菌株的小应变下适用于行为。为此，已经对粘土进行了环状三轴和扭转测试。基于实验结果，已经使用非线性运动学硬化规则开发了环状粘膜构成模型。在研究中，新提出的粘弹性粘膜塑性模型是为了描述小菌株中高频域中的能量耗散性化合物。最后，通过一维模拟，在1995年的Hoogoken-Nambu地震期间，在波特岛观察到的加速度记录，研究了粘土的粘弹性和粘质特性对粘土层（包括粘土层）动态行为的影响。

项目成果

Yashima,A,S.Leroucil F.Oka I.Guntoro: "Modelling temperaturs and strain rate dependent behavior of clays one dimensional consolidation" Sols and Foundations. 38巻2号. 63-73 (1998)

Yashima, A, S. Leroucil F. Oka I. Guntoro：“一维固结的温度和应变率相关行为建模”Sols and Foundations，第 38 卷，第 2. 63-73 期（1998 年）。

T.Yashima, S.Leroueil, F.Oka and I.Guntoro: "Modelling temperature and strain rate dependent behavior of clays: one dimensional consolidation"Soils and Foundation. 38,no.2. 63-73 (1998)

T.Yashima、S.Leroueil、F.Oka 和 I.Guntoro：“模拟粘土的温度和应变率相关行为：一维固结”土壤和基础。

T.Adachi,F.Oka,F.Zhang: "An elasto-viscoplastic constitutive model with strain softening"Soils and Foundations. 38-2. 27-35 (1998)

T.Adachi，F.Oka，F.Zhang：“具有应变软化的弹粘塑性本构模型”土壤和基础。

F.Oka.A.Yashima,K.Sawada: "Static and Dynamic charcteristics of Strain gradicnt dependent elastic and elasto-viscoplastic madels" Localigation and biturcation Theory for Soils and Rpocks. 71-79 (1998)

F.Oka.A.Yashima，K.Sawada：“应变梯度相关的弹性和弹粘塑性马德尔的静态和动态特征”土壤和岩石的定位和坑化理论。

T.Adachi, F.Oka and F.Zhang: "An elasto-viscoplastic constitutive model with strain softening"Soils and Foundations. 38,no.2. 27-35 (1998)

T.Adachi、F.Oka 和 F.Zhang：“具有应变软化的弹粘塑性本构模型”土壤和地基。