Dynamic stability analysis of the bedding rock slope considering the vibration deterioration effect of the structural plane

Abstract

In traditional dynamic stability analysis of the rock slope, more attention has been given to the influence of the dynamic load, but less attention to the vibration deterioration effect of the rock structural plane subjected to cyclic shear. Based on previous research results, a mathematical model was developed to calculate the vibration deterioration effect of the structural plane, which was further applied to the dynamic stability analysis of the rock slope in this paper. The process of vibration deterioration was realized by programming with FISH programming language in FLAC3D, and the numerical calculation method was adopted to analyze the slope stability during the earthquake and the long-term stability of the slope subjected to frequent microseisms. The results show that the vibration deterioration effect of the structural plane is more obvious with the enlargement of seismic load. Thus, it is more necessary to consider the vibration deterioration effect for dynamic stability analysis of the slope subjected to strong earthquakes. Permanent reduction of the shear strength of the slope sliding plane could even be caused by a microseism due to the vibration abrasion of the initial fluctuation angle. Therefore, influence caused by frequent microseisms on the long-term stability of the slope cannot be ignored. The probability statistics method was used to process the time-history curve of slope stability coefficient, which led overall evaluation index of the slope stability to be associated with the reliability theory. Research results in this paper can provide some reference to analyze the dynamic stability during the strong earthquakes and the long-term stability under frequent microseisms (e.g. reservoir-induced earthquakes and aftershocks) for the bedding rock slope.