考虑温度的盐岩分数阶黏弹塑性蠕变损伤模型

doi:10.13722/j.cnki.jrme.2021.1237

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摘要盐腔作为能源储备以及核废料处置的理想场所，长时间经受温度和应力双重作用的影响，导致储库围岩蠕变变形显著。为研究温度和应力对盐岩蠕变性能的影响，进行不同温度和偏应力下的三轴蠕变试验，得到温度和偏应力对稳态蠕变率的影响规律，拟合出稳态蠕变率本构方程参数。另外，引进分数阶Abel黏壶替换Maxwell模型中的线性黏壶元件，建立考虑温度的分数阶Maxwell模型，并将其与黏塑性体损伤模型串联，构建新的考虑温度的分数阶黏弹塑性蠕变损伤模型。基于室内三轴蠕变试验结果，利用1stOpt软件对蠕变损伤模型参数进行识别，对比分析理论模型和试验数据的相关性，验证模型的正确性，且新模型可以很好地模拟盐岩蠕变全过程。

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	张胜利1
	梁卫国1
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	肖宁1
	赵德生1
	李静1
	李超1

关键词 ：岩石力学, 盐岩, 温度效应, 三轴蠕变试验, 分数阶黏壶, 蠕变模型

Abstract：The surrounding rock of salt caverns，being ideal locations for the storage of energy and disposal of nuclear waste，presents with significant creep deformation over a long period of time due to being continually affected by a combination of stress and temperature. To determine the effects of temperature and stress on the creep of salt rock，triaxial creep tests at varying conditions were conducted，the mechanisms of the effects of temperature and deviatoric stress at steady-state creep rate were determined，and fitting was conducted to obtain the parameters of steady state creep rate constitutive equation. The linear dashpot of the Maxwell model was replaced by a fractional Abel dashpot to establish a fractional Maxwell model that can be used to consider the effects of temperature. A new fractional viscoelastic-plastic creep damage model considering temperature was achieved by connecting the viscoplastic damage model to the fractional Maxwell model. The parameters of the creep damage model were extracted from the results of the experimental triaxial creep test using 1stOpt software. The theoretical model results and tests data were compared to determine the validity of the creep damage model. The new model can well simulate the creep deformation in whole evolution.

Key words： rock mechanics salt rock temperature effect triaxial creep test fractional dashpot creep model

引用本文:

张胜利1，梁卫国1，2，肖宁1，赵德生1，李静1，李超1. 考虑温度的盐岩分数阶黏弹塑性蠕变损伤模型[J]. 岩石力学与工程学报, 2022, 41(S2): 3198-2309.
ZHANG Shengli1，LIANG Weiguo1，2，XIAO Ning1，ZHAO Desheng1，LI Jing1，LI Chao1. A fractional viscoelastic-plastic creep damage model for salt rock considering temperature effect. , 2022, 41(S2): 3198-2309.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.1237 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS2/3198

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