筑坝土石料的统一广义塑性本构模型

朱晟; 魏匡民; 林道通

doi:10.11779/CJGE201408003

筑坝土石料的统一广义塑性本构模型 English Version

朱晟^{1, 2},
魏匡民^{1, 2},
林道通^{1, 2}

1. 河海大学水文水资源与水利水电工程科学国家重点实验室,江苏南京 210098; 2. 河海大学水电学院,江苏南京 210098

详细信息

作者简介:
朱晟(1965- ),男,博士,教授,博士生导师,主要从事土石坝等水工岩土与环境岩土方面的研究。E-mail: szhu@hhu.edu.cn。

中图分类号: TV641
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出版历程
- 收稿日期: 2013-08-06
- 发布日期: 2014-08-18

Generalized plasticity model for soil and coarse-grained dam materials

ZHU Sheng^{1, 2},
WEI Kuang-min^{1, 2},
LIN Dao-tong^{1, 2}

1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China; 2. College of Hydraulics, Hohai University, Nanjing 210098, China

摘要

摘要: 室内三轴试验资料的分析表明：与砾石土心墙料不同,密实堆石料、砂砾料的破坏应力比,随围压的增长出现明显降低;而反映坝料剪胀特征的应力比,随着围压的增长基本不变。根据试验资料,建立了描述土石料剪胀状态和破坏状态的统一应力表达式;针对现有广义塑性模型不能合理反映土石料压缩性的问题,采用改进剪胀方程,利用室内压缩试验和三轴剪切试验成果,构造弹性和塑性模量,提出了一个可以考虑土石料复杂加载特性的实用的统一广义塑性本构模型;将上述模型编制程序,模拟土石料的试验加载,得到预测值与试验数据吻合良好,可较好反映筑坝土石料的应力变形特性。
- 弹塑性 /
- 本构模型 /
- 土石料 /
- 堆石坝
Abstract: The triaxial test data show that the stress ratio at the failure state of compacted rockfill and gravel significantly decreases with the increase of confining pressure, while their stress ratio at the critical state is substantially constant with high confining pressure. The expressions for the stress ratios at the failure state and the critical state are established according to the experimental data. For the existing generalized plasticity model which does not reasonably reflect the compressibility of soil-rockfill, a practical generalized plasticity constitutive model for soil aggregates is proposed considering complex loading conditions by adopting the improved dilatancy equation and using the indoor compression and triaxial test results. The calculated values are in good agreement with the experimental data by compiling programs for the above model to simulate the test load of earth-rockfill materials. The proposed model can reasonably reflect their stress and deformation characteristics.
- elasto-plasticity /
- constitutive model /
- earth-rockfill material /
- embankment dam

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参考文献(23)

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