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循环加-卸载岩石本构模型是预测压气储能洞室长期稳定性的关键,但目前还没有适用的本构模型,因此,提出了一种能够描述岩石循环加载和卸载的本构模型。鉴于岩石在循环作用下损伤不断累积,将基于Weibull分布的岩石损伤软化模型进行拓展,并用内变量疲劳本构模型描述每个循环的初始模量和卸载模量的变化,进而得到循环加-卸载作用下的岩石本构模型,然后将该模型与现有的试验结果进行对比。该模型物理意义明确,涉及的参数较少,且便于拟合。提出的循环加-卸载下岩石本构模型对试验数据拟合效果较好,能较准确地反映循环荷载上、下限值对应的轴向应变,也能反映出循环内部变形模量衰减的趋势。该模型的成功建立为循环加-卸载下岩石本构模型的研究提供了新思路。
Recycling-unloading rock constitutive model is the key to predict the long-term stability of gas storage cavern. However, there is no applicable constitutive model so far. Therefore, a constitutive model that can describe cyclic loading and unloading is proposed. In view of the continuous accumulation of damage under cyclic loading of rock, the rock damage softening model based on Weibull distribution is extended. The internal variable fatigue constitutive model is used to describe the variation of initial modulus and unloading modulus of each cycle, and then cyclic loading-unloading Rock constitutive model, and then compare the model with the existing experimental results. The physical meaning of the model is clear, involving less parameters, and easy to fit. The proposed rock-constitutive model of cyclic loading-unloading has good fitting effect on experimental data, can accurately reflect the axial strain corresponding to the upper and lower limit values of cyclic loading, and can also reflect the trend of decay of internal deformation modulus . The successful establishment of this model provides a new idea for the study of rock constitutive models under cyclic loading-unloading.