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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。
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. Based on the concepts of load-bearing surface and temperature equivalent stress, a soft-rock thermo-elasto-plastic model considering structure is proposed. This model has only one more parameter than the load-bearing model, namely the coefficient of linear thermal expansion. Computational analysis and comparison with experimental results show that the model can describe both the phenomenon of soft rock thermal enhancement and thermal weakening uniformly. The stronger the initial structure of soft rock, the greater the strength, and the initial structural changes can make the soft rock to heat exchange between heat and weakening. Whether the thermal enhancement or the thermal weakening, the larger the linear thermal expansion coefficient or the higher the temperature, the dissipation of the structural state variables will be accelerated; and this acceleration tendency will be more pronounced when the linear thermal expansion coefficient and the temperature are higher; It dissipates more easily than the thermal and thermal enhancements, ie the dissipation rate is faster.