Modeling of Time-Dependent Deformation of Jointed Rock Mass

To improve the understanding of time-dependent responses of jointed rock mass, a new creep model is developed and implemented in UDEC to simulate creep deformations of jointed rock mass considering time-dependent deformations of both rock and joints. First, the implementation of the Time-to-Failure (TtoF) model for rock and the creep slipping model for joint is introduced. Then, creep simulations are conducted to study the influence of joint dip and confining stress on the long-term stability of rock masses using square models with a single joint. Time-dependent deformation of a moderately jointed rock mass is simulated using a pillar model with multiple joints. Finally, a case study of a high rock slope in western Norway is conducted and the creep deformation mechanisms of the rock mass are analyzed by comparing two slope models with different joint strength properties. It is found that there is no unstable movement on the potential sliding surfaces of the slope. The proposed creep model of jointed rock mass provides a novel approach to analyze structural failures of jointed rock mass under creep loading conditions.