论文部分内容阅读
随着岩石蠕变特性在不同含水状态下试验研究的逐步开展,为了实际工程所需,应先提出能合理描述其蠕变规律的本构模型。为了准确描述浅变质板岩的蠕变行为,首先提出了一个新的非定常粘滞体元件,该元件的黏滞系数随时间不断发生变化。然后将该元件替换常规Kelvin模型中的定常粘滞体元件,建立了一种新的非定常Kelvin模型,并推导了模型的蠕变方程。最后基于浅变质板岩试样单轴压缩蠕变试验结果,采用曲线拟合的方法反演了非定常Kelvin模型和常规Kelvin模型的蠕变参数。通过对比试验曲线与拟合曲线发现:在不同应力水平下,相对于常规Kelvin模型,非定常Kelvin模型拟合曲线与试验结果更加吻合,说明该模型能够更好的描述浅变质板岩的蠕变特性,具有更好的适应性。
With the gradual development of experimental research on rock creep characteristics under different water conditions, a constitutive model that can reasonably describe the creep law should be put forward for practical engineering. In order to accurately describe the creep behavior of shallow metamorphic slate, a new unsteady viscous element is proposed. The viscous coefficient of the element changes with time continuously. Then, the element is replaced by the regular viscous element in the Kelvin model, a new unsteady Kelvin model is established and the creep equation of the model is deduced. Finally, based on the uniaxial compressive creep test results of shallow metamorphic slate samples, the creep parameters of unsteady Kelvin model and conventional Kelvin model are retrieved by curve fitting method. By comparing the test curve with the fitting curve, it is found that the fitting curve of the unsteady Kelvin model agrees well with the experimental results under different stress levels, which shows that the model can better describe the creep of shallow metamorphic slate Features, with better adaptability.