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为保证地下工程的施工和运行安全,研究温度-应力耦合作用下岩石蠕变特性具有十分重要的意义。基于西原模型,通过引入热损伤变量考虑塑性黏滞系数的改变,提出一种新的热力耦合蠕变损伤模型,建立了蠕变本构关系,推导了其一维和三维蠕变方程,根据硬脆性岩石蠕变试验结果,拟合获得蠕变力学参数,对模型的可靠性进行验证。
In order to ensure the safety of the construction and operation of underground engineering, it is very important to study the creep characteristics of rock under the coupling of temperature and stress. Based on the Nishihara model, a new thermomechanical creep damage model is proposed considering the change of plastic viscosity coefficient by introducing thermal damage variables. The creep constitutive relation is established and the one-dimensional and three-dimensional creep equations are derived. According to the hard and brittle Rock creep test results, the creep mechanical parameters are obtained by fitting, and the reliability of the model is verified.