Stability Analysis of Slope with Fault Fracture Zone Under Micro-seismic Load

CHEN Gang; LIU Gangyi

doi:10.13512/j.hndz.2024.01.16

Abstract：The influence of frequently-occurring small-magnitude micro-seismic action on the stability of rock slope cannot be ignored in the prevention and control of geological disasters.Moreover,the fault fracture zone characterized by special physical and mechanical properties directly affects the dynamic stability of the slope.Therefore,it is of great significance to study the dynamic response law and stability of bedding rock slope with fault fracture zone under micro-seismic load.Taking a bedding rock slope with fault fracture zone as the research object,shaking table model test and discrete element numerical simulation were carried out to explore the dynamic response law,deformation and failure characteristics and dynamic instability characteristics of the slope under micro-seismic action.The results show that the dynamic response of the slope under micro-seismic action exhibits elevation amplification effect and surface effect.The amplification coefficient of ground peak acceleration(GPA)decreases with the increase of amplitude and increases with the frequency.Meanwhile,the higher the elevation,the greater the amplitude of PGA amplification coefficient with amplitude and frequency.The greater the intensity of the micro-seismic,the less the number of micro-seismic corresponding to the failure of the slope;the stability coefficient of the slope gradually decreases with the increase of micro-seismic intensity and micro-seismic times.Under different vibration times,the relationship between slope stability coefficient and micro-seismic intensity follows linear attenuation.When the number of micro-seismic events reaches 4500,the micro-seismic intensity has the greatest influence on the slope stability.