粉砂质泥岩蠕变特性与非线性黏弹塑性本构模型研究
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作者单位:

1.长沙理工大学 土木工程学院;2.长沙理工大学公路养护技术国家工程实验室

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中图分类号:

TU411.6???????????

基金项目:

国家基金(51838001,51878070,51908069,51908073,52078066,52078067和52008041);湖湘青年科技创新人才项目(2020RC306);湖南省重点领域研发项目(2019SK2171);长沙市杰出创新青年培养计划项目(kq1905043);长沙市自然科学基金项目(kq2014110);长沙理工大学“双一流”科学研究国际合作拓展项目(2019IC04);国家级大学生创新创业训练项目(202120536003);长沙理工大学公路养护技术国家工程实验室开放基金资助项目(kfj170103)


Creep characteristics of silty mudstone and nonlinear viscoelastic-plasticity ontological model
Author:
Affiliation:

1.School of Civil Engineering,Changsha University of Science Technology;2.National Engineering Laboratory of Highway Maintenance Technology,Changsha University of Science Technology

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    摘要:

    利用粉砂质泥岩相似材料试样,开展不同围压下粉砂质泥岩蠕变试验,根据蠕变试验结果,建立可描述粉砂质泥岩蠕变全过程的非线性黏弹塑性本构模型,以7MPa围压下蠕变试验结果为例,对所提出的蠕变本构模型进行合理性和可行性验证。研究结果表明:试样稳态蠕变速率与偏应力之间符合指数函数关系;在加速蠕变阶段的蠕变速率相对低偏应力水平下减速蠕变和稳态蠕变速率明显要增大很多,且非常短时间内就发生了蠕变破坏;提出了一种可描述粉砂质泥岩全蠕变过程的非线性黏弹塑性本构模型,该模型可描述粉砂质泥岩蠕变-破坏全过程的蠕变变形规律,反映了粉砂质泥岩在不同偏应力水平作用下的蠕变特性。

    Abstract:

    Based on the creep test results, a nonlinear viscoelastic-plastic intrinsic model describing the whole creep process of silty mudstone was established, and the proposed creep intrinsic model was verified for its rationality and feasibility by taking the creep test results at 7 MPa as an example. The results show that: the steady-state creep rate of the specimen conforms to the exponential function relationship with the partial stress; the creep rate in the accelerated creep stage is significantly larger than that in the decelerated creep and steady-state creep at low stress level, and the creep damage occurs in a very short time; a nonlinear viscoelastic-plastic instrinsic model is proposed to describe the whole creep process of the silty mudstone, which can describe the creep-deformation process of the silty mudstone. This model can describe the creep-deformation law of the whole process of creep-damage of silty mudstone, and reflects the creep characteristics of silty mudstone under different levels of partial stress.

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  • 收稿日期:2021-12-01
  • 最后修改日期:2022-03-22
  • 录用日期:2022-03-26
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