Fluid Dynamics Based Numerical Analysis on Failure and Large Deformation of Soft Foundation

基于流体动力学的软基破坏及大变形数值分析

• 批准号: 11650503
• 负责人: YASHIMA Atsushi
• 金额: $ 2.24万
• 依托单位: Gifu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650503/
• 关键词: fluid dynamic; liquefaction; soft foundation; large deformation; prediction; numerical analysis; CIP method; Bingham fluid; CIP; 多層地盤; 3次元解析; 側方流動; 相似則; N-S方程式; Bingham流体

A new numerical method was proposed to simulate the mechanical behavior of soft foundation from its initial condition to large deformation and ultimate failure state based on the fluid dynamics based framework.Firstly, the SIMPLE-VOF method was proposed. In the numerical analysis, the Bingham constitutive model which has yield stress criteria was introduced. The proposed method reproduced the similitude law on the lateral spreading due to liquefaction. The large lateral flow failure of the embankment in the lake was also reproduced in the same framework.Secondly, CIP based numerical method which can treat compressive and incompressive fluids simultaneouly was proposed. The Bingham model was also introduced into the numerical method. The similitude law was reproduced for the lateral spreading of single layer ground. The lateral flow of the liquefied layer on which non-liquefied layer exists was also predicted. The numerical method was found to reproduce the experimental results on multi layer ground quantitatively.Finally, CIP method was applied to predict the settlement analysis of the embankment with reinforcement. The significant effect of the reinforcement to reduce the embankment settlement was predicted by the newly proposed method.

基于流体动力学框架，提出了一种新的数值方法来模拟软地基从初始状态到大变形和最终破坏状态的力学行为。 首先，提出了SIMPLE-VOF方法。数值分析中引入了具有屈服应力准则的Bingham本构模型。该方法再现了液化引起的横向扩散的相似定律。在同一框架下也再现了湖中堤坝的大侧流破坏。 其次，提出了基于CIP的同时处理压缩和非压缩流体的数值方法。 Bingham模型也被引入到数值方法中。再现了单层地面横向扩展的相似定律。还预测了存在非液化层的液化层的侧向流动。数值方法能够定量再现多层地基上的试验结果。最后，采用CIP方法对加筋路堤的沉降进行预测分析。通过新提出的方法预测了加固对减少路堤沉降的显着效果。

项目成果

S.Hadush: "Importance of viscous fluid characteristics in liquefaction induced Lateral spreading analysis"Computers and geotechnics. 27-3. 199-224 (2000)

S.Hadush：“粘性流体特性在液化引起的横向扩散分析中的重要性”计算机和岩土工程。

八嶋 厚: "軟弱地盤上の補強土盛土の挙動予測に関する流体力学的アプローチ"第34回地盤工学研究発表会講演集. 2. 1799-1800 (1999)

Atsushi Yashima：“预测软土地基上加筋土路堤性能的水动力方法”第 34 届岩土工程研究会议论文集 2. 1799-1800 (1999)。

Seged Hadush: "Velification of the similitude law for flow of liquefied ground"Prec.7th US-Japan Workship on Earthquake Resistant Design of lifeline Facilities and Countermeasures against Soil Liguefaction. (印刷中). (1999)

Seged Hadush：“液化地面流动相似定律的验证”Prec.7th 美日生命线设施抗震设计和土壤液化对策研讨会（1999 年出版）。

Seged Hadush: "Verification of the similitude law for flow of liquefied ground"Proc.The 7th U.S.-Japan Workshop on Earthquake Resistant Design of Lifeline Facilities and Countermeasures against Soil Liquefaction. 221-236 (1999)

Seged Hadush：“液化地面流动相似定律的验证”，第七届美日生命线设施抗震设计及土壤液化对策研讨会。

Yashima, A., Mutsuda, H., Haduch, S.and Adachi, T.: "Fluid dynamics based prediction of reinforced embankment on soft faoundation"Proc.34th Annual Meeting of JGS. 1799-1800 (1999)

Yashima, A.、Mutsuda, H.、Haduch, S. 和 Adachi, T.：“基于流体动力学的软基加固路堤预测”Proc.34th JGS 年会。