三向应力状态下冻融岩石损伤本构模型

张慧梅; 谢祥妙; 彭川; 杨更社; 叶万军; 申艳军

doi:10.11779/CJGE201708011

三向应力状态下冻融岩石损伤本构模型 English Version

1. 西安科技大学力学系,陕西西安 710054;
2.广西建工集团基础建设有限公司,广西南宁 530001;
3. 西安科技大学建筑与土木工程学院,陕西西安 710054

基金项目: 国家自然科学基金项目（11172232,41272340,41302228,41672305）; 中国博士后科学基金项目（2014T70931）; 陕西省重点科技创新团队计划项目（2014KCT-30）

详细信息

作者简介:
张慧梅(1968- ),女,教授,博士生导师,主要从事力学与岩土工程方面的教学与研究工作。E-mail：zhanghuimei68@163.com。

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出版历程
- 收稿日期: 2016-05-07
- 发布日期: 2017-08-24

Constitutive model for damage of freeze-thaw rock under three-dimensional stress

1. Department of Mechanics, Xi°an University of Science and Technology, Xi°an 710054, China;
2. Infrastructure Construction Co., Ltd., Guangxi Construction Engineering Group, Nanning 530001, China;
3. College of Architecture and Civil Engineering, Xi°an University of Science and Technology, Xi°an 710054, China;

摘要

摘要: 充分考虑岩石材料缺陷随机性的特点,基于连续损伤力学理论,建立了考虑围压影响的冻融荷载作用损伤模型;根据红砂岩变形破坏曲线的几何条件,采用全微分方法确定了仅含岩石基本特征参量的模型参数表达式;通过红砂岩冻融循环力学特性试验,验证了模型的合理性。研究表明：红砂岩以裂纹为主导的细观力学响应与宏观变形破坏特性相一致;随着冻融循环次数的增加,岩石损伤程度加剧,宏观上表现为材料力学性能的劣化。但在变形中后期,相同损伤程度时岩石应变增加,塑性特性增强;围压可改善岩石受力状态,因而随着围压的增加,岩石损伤程度减小,宏观上表现出材料抵抗破坏能力的增强和塑性变形的增加。
- 围压 /
- 冻融循环 /
- 试验 /
- 损伤本构模型 /
- 模型参数
Abstract: Considering the random characteristics of defects of rock materials, the model for damage of freeze-thaw and loaded rock considering the influence of confining pressure is established based on the theory of continuum damage mechanics. According to the geometric condition of the deformation and failure curve of red sandstone, the expressions for model parameters containing only the basic characteristic parameters of rock are determined. The rationality of the model is verified by the experiments on mechanical characteristics of rock under freeze-thaw cycls. It is shown that the crack-dominated micro mechanical response of the red sandstone is consistent with the macroscopic deformation and failure characteristics. The damage degree of sandstone, which is shown as the deterioration of the mechanical properties of the materials in the macroscopic performance, increases with the increase of the number of freeze-thaw cycles. But the strain of rock increases and the plastic property increases with the same damage degree at the later stage of deformation. The confining pressure can improve the stress state of rock, so the damage degree decreases with the increase of the confining pressure, which is shown as the strength of the materials to resist damage and the increase of plastic deformation.
- confining pressure /
- freeze-thaw cycle /
- experiment /
- damage constitutive model /
- model parameter

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参考文献(19)

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