基于广义位势理论的岩土塑性应变增量方向非唯一性问题

发布时间：2018-03-14 23:05

本文选题：广义位势理论　切入点：塑性应变增量方向　出处：《中南大学学报(自然科学版)》2015年04期 　论文类型：期刊论文

【摘要】：基于广义位势理论提出的考虑拟弹性的弹塑性模型(拟弹性弹塑性模型)把总的塑性应变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,这样分解后建立的模型更为合理和简便,同时又可以解决岩土塑性应变增量方向非唯一性的问题。研究结果表明:基于广义位势理论的拟弹性弹塑性模型的模拟效果较好,传统的弹塑性模型只能反映塑性应变增量方向的唯一性,而拟弹性弹塑性模型则能够同时反映塑性应变增量方向的唯一性(高应力水平时)和非唯一性(低应力水平时),结果更符合实际,从而为解决塑性应变增量方向非唯一性问题提供了一种有效的方法。
[Abstract]:Based on the generalized potential theory, a quasi-elastic elastoplastic model (pseudoelastic elastoplastic model) is proposed, in which the total plastic strain is decomposed into the quasi-elastic part satisfying the elastic decomposition criterion and the pure plastic part which conforms to the hypothesis of the traditional plastic theory. The model is more reasonable and simple, and can solve the problem of non-uniqueness of the direction of plastic strain increment in geotechnical field. The results show that the pseudoelastic-plastic model based on generalized potential theory has good simulation effect. The traditional elastic-plastic model can only reflect the uniqueness of the direction of plastic strain increment. The pseudoelastic elastoplastic model can reflect both the uniqueness (at high stress level) and the non-uniqueness (at low stress level) of the incremental direction of plastic strain. The results are more practical. This provides an effective method for solving the non-uniqueness problem of the incremental direction of plastic strain.
【作者单位】：武汉大学土木建筑工程学院;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;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(51378131,51378403,51174093) 中央高校基本科研业务费专项资金资助项目(2012210020203)~~
【分类号】：TU43

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