In order to study the creep behavior of the surrounding rock of Hengda coal mine in Fuxin under different temperatures, the triaxial creep test of sandstone is carried out by the MTS815.02 test system. The relationship between damage variables and temperature is constructed based on the Weibull distribution of the meso-probability voxel intensity. Aiming at the nonlinear characteristics of rock creep, a nonlinear viscous pot element and a nonlinear spring element are proposed. The two linear viscous pot elements and one linear spring element in the Nishihara model can be replaced separately. Thus, an unsteady parameter creep model is established. The comparison between the Nishihara model curve and the model and the experimental curves in this article has been added to the article. Furthermore, the superiority of this model can be proved. The results show that the established variable-time aging creep model not only can describe the rock attenuation creep and stable creep deformation characteristics but also can make up for the shortcomings of the traditional creep model that cannot describe the accelerated creep characteristics. Moreover, it predicts the development law of creep deformation well. The model is in good agreement with the test curve, which shows the correctness and rationality of the model. It has guiding significance for actual engineering support and prediction of long-term deformation of surrounding rock.

中文翻译：

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温应力耦合下深部围岩时变蠕变本构模型

为研究阜新恒大煤矿围岩在不同温度下的蠕变行为，利用MTS815.02测试系统对砂岩进行了三轴蠕变试验。损伤变量与温度之间的关系是基于细观概率体素强度的威布尔分布构建的。针对岩石蠕变的非线性特性，提出了一种非线性粘性罐单元和非线性弹簧单元。Nishihara 模型中的两个线性粘性锅元件和一个线性弹簧元件可以单独更换。由此，建立了非定常参数蠕变模型。文章中增加了西原模型曲线与本文模型和实验曲线的对比。此外，可以证明该模型的优越性。结果表明，所建立的变时效蠕变模型不仅可以描述岩石衰减蠕变和稳定蠕变变形特征，而且可以弥补传统蠕变模型无法描述加速蠕变特征的缺点。并且很好地预测了蠕变变形的发展规律。模型与试验曲线吻合较好，说明模型的正确性和合理性。对实际工程支护和围岩长期变形预测具有指导意义。