模拟主应力轴旋转的本构模型(英文)

A soil model considering principal stress rotation

很多岩土工程会遇到主应力轴旋转的问题,典型的例子包括地震荷载、波浪荷载,考虑主应力轴旋转对岩土工程的影响有重要意义。构建了一个考虑主应力轴旋转的移动硬化土弹塑性本构模型。该模型分离出了引起主应力轴旋转的应力增量,独立考虑其对应力应变反应的作用。该模型能够考虑多维的主应力轴旋转作用,方程式简单、易于数值应用。利用该模型模拟了一维及多维主应力轴旋转对土应力应变的作用,后者较前者更容易引起土的破坏。

An elastoplastic soil model considering the principal stress rotation(PSR) is proposed, which occurs in many geotechnical engineering problems such as in offshore foundations under wave loading. The model is developed on the basis of a well-established kinematic hardening soil model using the bounding surface concept. The significance of including the PSR in soil models is presented. The proposed model can consider the PSRs under multiple directions, and features relatively simple formulations and easy numerical implementations. Model predictions under one and multiple PSRs are compared, and the latter leads to a larger damage to soils than the former.