基于广义位势理论的非共轴本构模型验证

发布时间：2018-07-28 15:52

【摘要】：基于广义位势理论提出的考虑拟弹性塑性变形的弹塑性模型,把塑性应变增量分解为满足弹性分解准则的拟弹性部分和符合传统塑性理论假设的纯塑性部分,这样得到的塑性应变增量方向不仅与应力状态有关,而且与应力增量相关,为解决土的非共轴性问题提供一种有效的方法。通过单剪试验结果及含主应力轴旋转的土体平面问题数值模拟对模型的合理性进行检验。研究结果表明:本文模型计算结果与试验结果吻合较好,且能够描述单剪试验过程中的非共轴现象;此外,与共轴模型数值模拟结果相比,本文模型能够考虑主应力轴旋转产生的土体塑性变形,计算结果更符合实际。
[Abstract]:Based on the generalized potential theory, the elastic-plastic model considering the quasi-elastic plastic deformation is proposed. The plastic strain increment is decomposed into the quasi-elastic part satisfying the elastic decomposition criterion and the pure plastic part which accords with the hypothesis of the traditional plastic theory. The direction of plastic strain increment is not only related to the stress state, but also to the stress increment, which provides an effective method to solve the non-coaxial problem of soil. The rationality of the model is verified by the results of the single shear test and the numerical simulation of the soil plane problem with the rotation of the principal stress axis. The results show that the calculated results are in good agreement with the experimental results, and can describe the non-coaxial phenomena in the process of single shear tests, in addition, compared with the results of the numerical simulation of the coaxial model, In this paper, the plastic deformation of soil caused by rotation of principal stress axis can be taken into account, and the calculated results are more practical.
【作者单位】：中山大学地球科学与工程学院;广东省水利水电科学研究院;广东省岩土工程技术研究中心;武汉大学土木建筑工程学院;上海大学上海市应用数学和力学研究所;中铁第四勘察设计院集团有限公司;
【基金】：国家自然科学基金资助项目(51378131,41572277) 广东省自然科学基金资助项目(2015A030313118) 广东省水利科技创新项目(2009-25) 广东省岩土工程技术研究中心开放基金资助项目(201404002)~~
【分类号】：TU43

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