摘要
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。
It is very important to study the creep characteristics of rock under thermo-mechanical coupling effect to ensure the safety of underground engineering construction and operation. A new thermal-mechanical creep damage model was brought forward,which was considered the thermal damage for coefficient of plastic-viscosity by thermal damage variable based on Nishihara model. The creep constitutive relation and creep equation of one-dimensional and three-dimensional were established. The creep mechanical parameters were obtained by fitting the results of hard and brittle rock creep tests,and the reliability of the model was verified.
引文
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