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

基于流体动力学框架，提出了一种模拟软土地基从初始状态到大变形和最终破坏状态力学行为的数值方法。在数值分析中，引入了具有屈服应力准则的宾汉本构模型。该方法再现了液化侧移的相似规律。其次，提出了基于CIP的数值计算方法，该方法可以同时处理压缩性和非压缩性流体。将宾汉模型引入到数值计算中。再现了单层地基侧向扩展的相似规律。对液化层与非液化层之间的侧向流动进行了预测。最后，将CIP法应用于加筋路堤的沉降预测分析。新提出的方法预测了加筋对减少路堤沉降的显著效果。

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.