ABSTRACT:

A subcritical crack growth based deformation model was established to describe the time-dependent deformation and fracturing of rock. In conjunction with the uniaxial compression test of rock, the microscopic parameters of the model were calibrated, and the accuracy of the creep model and parameter calibration were verified using uniaxial compressive creep tests. Finally, the established time-dependent deformation model of rock was applied to the time-dependent deformation analysis of a slope in the Fushun West open-pit mine. This study shows that the time-dependent deformation model of rock established in this study can effectively describe the accelerated stage of rock creep, and the simulation results agree well with the experimental results. After the continuous deformation, cracks are formed by the stress concentration at the bottom of the slope under the influence of unfavorable factors, which continuously extend to the top of the slope and form a sliding surface, resulting in unstable sliding.

INTRODUCTION

The time-dependent deformation of rock mass can lead to damage deformation or even destruction of engineering rock mass, and the time-dependent mechanical properties and long-term stability of engineering rock mass have been the focus. It was an effective way to study rock time-dependent deformation to establish a model of rock time-dependent deformation to analyze the behavior of rock deformation under different environments. It has been proved that the theory of subcritical crack propagation can explain the time-dependent deformation mechanism of rocks on the mesoscale (Atkinson BK, 1987; Michalske TA, 1982; Potyondy, 2007).

In this paper, the stress corrosion theory was introduced into the three-dimensional discrete element program 3DEC to establish the rock time-dependent deformation model based on the stress corrosion theory. Combined with the uniaxial compression test of rock, the microscopic parameters of the model were calibrated, and the accuracy of the creep model and parameter calibration were verified based on uniaxial compressive creep tests. Finally, the established time-dependent deformation model of rock was applied to the time-dependent deformation analysis of the Fushun West open-pit mine.

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