考虑蠕变过程损伤的盐岩蠕变模型

IF 2.1 4区 材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
Cheng Lyu, Chao Ma, Hangyu Dai, Ping Zhou, Deng Xu, Chao Liang, Chengxing Zhao
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引用次数: 0

摘要

了解盐岩蠕变特性对盐洞室的设计和施工具有重要意义。通过盐岩三轴多阶段蠕变试验和声发射监测,揭示了偏应力对盐岩蠕变和声发射特征的影响。通过盐岩蠕变声发射试验,从微观角度揭示了盐岩蠕变过程中声发射的演化特征。以往描述岩石蠕变的本构模型只考虑了加速阶段的损伤效应,不能准确描述蠕变过程中的损伤演化过程。利用声发射特征参数,建立了盐岩蠕变过程损伤本构模型,揭示了盐岩蠕变过程中损伤演化呈指数递增趋势。考虑盐岩蠕变过程中的损伤效应,建立了基于分数阶导数的蠕变损伤本构模型,并分别给出了一维和三维应力状态的表达式。通过三轴蠕变试验数据对该模型和经典模型进行了标定,结果表明该模型能较好地描述盐岩的非线性蠕变特性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A creep model for salt rock considering damage during creep

A creep model for salt rock considering damage during creep

A creep model for salt rock considering damage during creep

Understanding salt rock creep properties is important for designing and operating salt caverns. Triaxial multistage creep test of salt rock and acoustic emission (AE) monitoring were conducted, revealing the influence of deviatoric stress on the creep and AE characteristics of salt rock. Based on the creep AE test of salt rock, the evolution characteristics of AE during the creep process of salt rock are revealed from a microscopic point of view. Previous constitutive models describing rock creep only considered the damage effect during the accelerated stage, and could not accurately depict the damage evolution during the creep process. Using AE characteristic parameters, a damage constitutive model was established, revealing an exponential increasing trend in damage evolution during salt rock creep process. Considering the damage effects during salt rock creep, a novel creep damage constitutive (CDC) model was constructed based on fractional derivatives, and expressions for one-dimensional and three-dimensional (3D) stress states were given respectively. The proposed model and the classical model were calibrated by the triaxial creep test data, indicating that the proposed model can better describe the nonlinear creep characteristics of salt rock.

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来源期刊
Mechanics of Time-Dependent Materials
Mechanics of Time-Dependent Materials 工程技术-材料科学:表征与测试
CiteScore
4.90
自引率
8.00%
发文量
47
审稿时长
>12 weeks
期刊介绍: Mechanics of Time-Dependent Materials accepts contributions dealing with the time-dependent mechanical properties of solid polymers, metals, ceramics, concrete, wood, or their composites. It is recognized that certain materials can be in the melt state as function of temperature and/or pressure. Contributions concerned with fundamental issues relating to processing and melt-to-solid transition behaviour are welcome, as are contributions addressing time-dependent failure and fracture phenomena. Manuscripts addressing environmental issues will be considered if they relate to time-dependent mechanical properties. The journal promotes the transfer of knowledge between various disciplines that deal with the properties of time-dependent solid materials but approach these from different angles. Among these disciplines are: Mechanical Engineering, Aerospace Engineering, Chemical Engineering, Rheology, Materials Science, Polymer Physics, Design, and others.
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