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软岩热-弹-黏塑性本构模型

张升, 徐硕, 熊勇林, 张锋

张升, 徐硕, 熊勇林, 张锋. 软岩热-弹-黏塑性本构模型[J]. 岩土工程学报, 2016, 38(12): 2278-2286. DOI: 10.11779/CJGE201612017
引用本文: 张升, 徐硕, 熊勇林, 张锋. 软岩热-弹-黏塑性本构模型[J]. 岩土工程学报, 2016, 38(12): 2278-2286. DOI: 10.11779/CJGE201612017
shu
ZHANG Sheng, XU Shuo, XIONG Yong-lin, ZHANG Feng. Thermo-elasto-viscoplastic model for soft rock[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(12): 2278-2286. DOI: 10.11779/CJGE201612017
Citation: ZHANG Sheng, XU Shuo, XIONG Yong-lin, ZHANG Feng. Thermo-elasto-viscoplastic model for soft rock[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(12): 2278-2286. DOI: 10.11779/CJGE201612017
shu

软岩热-弹-黏塑性本构模型  English Version

  • 1. 中南大学土木工程学院,湖南 长沙 410075;
    2. 高速铁路建造技术国家工程实验室,湖南 长沙 410075;
    3. 同济大学土木工程学院,上海 200092;
    4.名古屋工业大学,日本 名古屋

基金项目: 国家重点基础研究发展计划（“973”计划）项目（2014CB047001）; 国家自然科学基金项目（51208519）
详细信息
    作者简介:

    张 升(1979- ),男,湖南邵阳人,博士,副教授,主要从事岩土工程数值模拟、岩土材料本构特性等方面的研究与教学工作。E-mail: zhang-sheng@csu.edu.cn。

Thermo-elasto-viscoplastic model for soft rock

  • 1. School of Civil Engineering, Central South University, Changsha, Hunan 410075, China;
    2. National Engineering Laboratory for High Speed Railway Construction, Changsha, Hunan 410075, China;
    3. Department of Civil Engineering, Tongji University, Shanghai 200092, China;
    4. Department of Civil Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan

摘要

    摘要
  • 摘要: 在诸多岩土工程如高放核废料处置、地热资源开发等应用中需要考虑软岩的长期力学特性,而温度升高会对软岩材料的蠕变破坏特性产生复杂影响,建立能反映蠕变破坏特性的本构模型具有理论价值和现实意义。从连续介质力学入手,基于下负荷面剑桥模型和等价应力的概念,建立了能描述软岩在温度作用下蠕变过程的热弹黏塑性模型。利用自主开发的仪器,采用大谷石进行了不同围压下的三轴蠕变试验,并对模型进行了验证。多种实验结果表明,材料在不同应力状态下,存在最优温度使得蠕变破坏最慢,此外,受温升影响时存在蠕变破坏加快和减慢两种现象,提出的模型能统一描述这两种现象。分析了模型特性,总结了不同材料参数和应力状态对蠕变规律的影响。
    Abstract: In the construction of many geotechnical projects, such as nuclear waste disposal and geothermal extraction and storage, it is necessary to consider the long-term mechanical properties of soft rock. Furthermore, the evaluated temperature will cause a complicated influence on the creep damage behaviors of soft rock. In consequence, it is theoretically and practically meaningful to establish a constitutive model which can describe the creep damage behaviors. Within the framework of continuum mechanics, a thermo-visco-elastoplastic model is proposed based on the sub-loading Cam-clay model and the concept of equivalent stress. Triaxial creep tests on Tage stone under different confining pressures are conducted by using the self-developed apparatus. Compared with the numerical results, the experimental results exhibit that for a certain stress state, an optimum temperature exists, which will slow down the creep damage rate the most. In addition, both retarding and accelerating effects on creep rupture due to limited warming are observed for the same material, and this phenomenon can be predicted by the proposed model. Finally, model characteristics are analyzed, and the influence of material parameters on creep laws is discussed.
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    • 参考文献(25)
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出版历程
  • 收稿日期:  2015-10-10
  • 发布日期:  2016-12-24

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