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.

1995年兵库县南部地震后，液化被认为是造成地面破坏的重要因素。众所周知，软粘土沉积物沉积在大阪市等日本城市地区周围。为了准确地阐明地基的抗震能力，有必要明确诸如里氏7级兵库县南部地震这样的大地震造成的软粘土沉积物的动力行为。为此，目前研究重点是粘土动态行为的建模。所提出的模型适用于 1% 左右的小应变和超过 10% 的大应变下的行为。为此，对粘土进行了循环三轴和扭转试验。基于实验结果，利用非线性运动硬化规则开发了循环粘塑性本构模型。在研究中，新提出了粘弹粘塑性模型，以描述小应变下高频域的能量耗散特性。最后，通过对1995年兵库县南部地震期间波特岛观测到的加速度记录进行一维模拟，研究了粘土的粘弹性和粘塑性特性对包括粘土层在内的地基动力行为的影响。

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。