基于临界状态模型的砂土非共轴本构模拟

›› 2011, Vol. 32 ›› Issue (S1): 230-235.

基于临界状态模型的砂土非共轴本构模拟

扈萍¹，茂松^{2, 3}，马少坤⁴，秦会来⁵

1. 济南大学土木建筑学院，济南 250022；2. 同济大学地下建筑与工程系；上海 200092； 3. 同济大学岩土及地下工程教育部重点实验室，上海 200092；4. 广西大学土木建筑工程学院，南宁 530004； 5. 中国水利水电科学研究院岩土工程研究所，北京 100048

收稿日期:2011-11-12 出版日期:2011-05-15 发布日期:2011-05-16
作者简介:扈萍，女，1980年生，讲师，博士，主要从事岩土本构理论的研究
基金资助:
济南大学博士基金（No. XBS0915）

Non-coaxial constitutive modeling of sands based on critical state model

HU Ping¹, HUANG Mao-song^{2, 3}, MA Shao-kun⁴, QIN Hui-lai⁵

1. School of Civil Engineering and Architecture, University of Jinan, Jinan 250022, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 3 Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 4. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China; 5. Department of Geotechnical Engineering, China Institute of Water Resources and Hydropower Research, Beijing 100048, China

Received:2011-11-12 Online:2011-05-15 Published:2011-05-16

摘要/Abstract

摘要：

传统的砂土本构理论隐含了应力和塑性应变率的共轴条件，无法客观描述主应力轴旋转试验中的非共轴现象，并且当密度和围压变化较大时也不适用。基于材料状态相关砂土临界状态概念，将Pietruszczak和Stolle所提出的砂土本构模型进行了改进，并在模型中引入非共轴塑性流动理论来描述非共轴现象。通过对单剪试验和空心圆柱试验进行数值模拟，表明基于临界状态理论的非共轴模型能够合理描述主应力轴旋转过程中砂土的非共轴变形特性

关键词: 临界状态, 非共轴, 单剪, 空心圆柱, 数值模拟

Abstract:

Classical coaxial plasticity constitutive models implicate an inevitable limitation that directions for principal stress and that for principal plastic strain rate are always coaxial; so they are not capable of simulating non-coaxial phenomena during the rotation of principal stress axis. And they are not suitable for the conditions which the density of the sand and the confining pressure are changed on a large scale. In this paper, the sand model put forward by Pietruszczak and Stolle(1987) is modified based on the existing state-dependent critical state conception of sand; and the non-coaxial plasticity theory is introduced to describe the non-coaxial behavior under principal axes rotation. With a series of numerical simulations of simple shear and hollow cylindrical torsional shear tests, it is shown that the non-coaxial model combined with critical state theory is able to simulate successfully the non-coaxial behavior of sands subjected to principal stress axis rotation

Key words: critical state, non-coaxial, simple shear, hollow cylinder, numerical simulation

中图分类号:

TU 47

扈萍，茂松，马少坤，秦会来. 基于临界状态模型的砂土非共轴本构模拟[J]. , 2011, 32(S1): 230-235.

HU Ping, HUANG Mao-song, MA Shao-kun, QIN Hui-lai. Non-coaxial constitutive modeling of sands based on critical state model[J]. , 2011, 32(S1): 230-235.

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