适用于膨胀性非饱和土的边界面模型的数值实现

发布时间：2018-03-29 23:19

本文选题：土力学　切入点：非饱和土　出处：《岩石力学与工程学报》2017年10期

【摘要】：基于完全隐式的Euler向后积分算法,对一个适用于膨胀性非饱和土的边界面模型提出一种应力积分方法。模型中的塑性变形具有双重机制即加载湿陷机制和微观结构机制,并考虑力学行为与持水滞回间的耦合作用。依据当前应力状态、力学与持水模型中各塑性机制的发生情况,将应力积分过程中的当前增量步分为多种情况,针对每一情况利用Euler向后算法进行试算,并依据判定准则选取结果。其次,利用该模型分别对已有的吸力循环试验和三轴压缩试验进行了验证,以此反映模型的预测能力和算法的运行能力。最后,对比不同步长的应变控制试验路径下的计算结果,以此验证应力积分方法的稳定性和精度。
[Abstract]:Based on the fully implicit Euler backward integral algorithm, a stress integration method is proposed for a boundary surface model suitable for expansive unsaturated soils. The plastic deformation in the model has two mechanisms, namely, loading collapsing mechanism and microstructure mechanism. Considering the coupling action between mechanical behavior and water-holding hysteresis, according to the current stress state and the occurrence of each plastic mechanism in mechanics and water-retaining model, the current increment step in the stress integral process is divided into several cases. For each case, the Euler backward algorithm is used for the trial calculation, and the result is selected according to the criterion. Secondly, the existing suction cycle test and triaxial compression test are verified by the model, respectively. The prediction ability of the model and the running ability of the algorithm are reflected. Finally, the stability and accuracy of the stress-integral method are verified by comparing the calculation results under the strain-control test path with asynchronous length.
【作者单位】：北京交通大学城市地下工程教育部重点实验室;山东省地震局;
【基金】：国家自然科学基金青年基金项目(51608033) 中央高校基本科研业务费专项资金(2016RC043)~~
【分类号】：TU443

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