考虑结构性的软岩热弹塑性本构模型研究

发布时间：2018-02-11 23:43

  本文关键词： 岩石力学 线性热膨胀系数 本构模型 弹塑性　出处：《岩石力学与工程学报》2017年03期 　论文类型：期刊论文

【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。
[Abstract]:In the fields of nuclear waste storage, geothermal and deep mining, the influence of temperature on the mechanical properties of soft rock can not be ignored. A thermoelastic-plastic model of soft rock considering structure is proposed. The model is only one more parameter than the upper load surface model, that is, the coefficient of thermal expansion. The model can describe both the thermal enhancement and the thermal weakening of soft rock. The stronger the initial structure of soft rock is, the stronger the strength of soft rock is. The change of initial structure can make the soft rock transform between thermal enhancement and thermal weakening. The larger the coefficient of linear thermal expansion or the higher the temperature, the faster the dissipation of structural state variables will be. When the linear thermal expansion coefficient and temperature are both higher, the acceleration trend is more obvious, and the structure dissipates more easily than that under the condition of heat weakening and thermal strengthening, that is, the dissipation rate is faster.
【作者单位】： 中南大学土木工程学院;中南大学高速铁路建造技术国家工程实验室;名古屋工业大学;
【基金】：国家重点基础研究发展计划(973)项目(2014CB047001) 国家自然科学基金资助项目(51508578)~~
【分类号】：TU45
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本文编号：1504282