Abstract
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.
Highlights
After the deep coal mining, the surrounding rock of the roadway undergoes time-dependent deformation under the action of the supporting body, and this time-related deformation is generally called rheology [1]
In order to further study the creep deformation characteristics and failure mechanism of rock under high confining pressure, high temperature, high ground stress, and strong disturbance condition, it is necessary to carry out an indoor creep test on the rock
A suitable creep constitutive model can be constructed by experimental conditions and data, which is of great significance for studying the creep mechanism of materials [6,7,8]
Summary
After the deep coal mining, the surrounding rock of the roadway undergoes time-dependent deformation under the action of the supporting body, and this time-related deformation is generally called rheology [1]. In order to further study the creep deformation characteristics and failure mechanism of rock under high confining pressure, high temperature, high ground stress, and strong disturbance condition, it is necessary to carry out an indoor creep test on the rock. A suitable creep constitutive model can be constructed by experimental conditions and data, which is of great significance for studying the creep mechanism of materials [6,7,8]. Scholars had done a lot of research on the rheological properties of rocks, the mechanism of deformation and failure, and how to construct a suitable creep model [9,10,11]. E mechanical properties of rocks were studied, and a nonlinear creep model of rock was constructed. A time-dependent creep constitutive model of deep surrounding rock under temperature-stress coupling was constructed. The correctness of the creep model was verified by comparing the experimental data with the model curve
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