考虑结构性的软岩热弹塑性本构模型研究

doi:10.13722/j.cnki.jrme.2015.1734

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摘要在核废料贮存、地热和深部采矿等领域中，温度对软岩力学特性的影响不容忽视。基于上负荷面和温度等效应力概念，提出一个考虑结构性的软岩热弹塑性模型。该模型比上负荷面模型仅多一个参量，即线性热膨胀系数。计算分析及其与试验结果对比表明，该模型既能够统一描述软岩热增强和热减弱2种现象。软岩初始结构性愈强，强度愈大，且初始结构性的变化可使软岩在热增强和热减弱之间相互转换。无论热增强或者热减弱，线性热膨胀系数越大或者温度越高，结构性状态变量的消散均会加快；并且，当线性热膨胀系数和温度均较高时，这种加速趋势会更为显著；相较于热减弱和热增强情况下的结构性更容易消散，即消散速率更快。

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关键词 ：岩石力学, 线性热膨胀系数, 本构模型, 弹塑性

Abstract：In the fields of nuclear waste landfill，geothermy and deep mining，the effects of temperature on the mechanical behaviors of soft rocks cannot be neglected. A thermo-elasto-plastic model of soft rocks considering structure was proposed based on the super loading yield surface and the concept of temperature-deduced equivalent stress. Compared to the super loading yield surface，only one more parameter is added，i.e.，the linear thermal expansion coefficient. The predicted results and the test results show that the proposed model is capable of describing both the phenomenons of heat-increase and heat-decrease of soft rocks. The stronger the initial structure，the larger the strength of soft rocks. The phenomenons of heat-increase and heat-decrease switch from each other due to the change of the initial structure of soft rocks. Furthermore，no matter whether the heat-increase or heat-decrease，a larger linear thermal expansion coefficient or a greater temperature，always leads to much more rapid dissipation of the structure. When the linear thermal expansion coefficient and temperature are larger at the same time，the dissipation trend will be more obvious. Lastly，the structure dissipates more easily in the case of heat-increase than in the heat-decrease.

Key words： rock mechanics linear thermal expansion coefficient constitutive model elastoplastic

引用本文:

张升1，2，贺佐跃1，2，滕继东1，2，张锋3. 考虑结构性的软岩热弹塑性本构模型研究[J]. 岩石力学与工程学报, 2017, 36(3): 571-578.
ZHANG Sheng1，2，HE Zuoyue1，2，TENG Jidong1，2，ZHANG Feng3. A thermo-elasto-plastic model for soft rocks considering structure. , 2017, 36(3): 571-578.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.1734 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/I3/571

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