Failure evolution process of pile-anchor reinforced rock slope based on centrifuge shaking table tests

Abstract

The frequency of earthquake-triggered landslides has increased in recent years, thus urgently necessitating the development of prevention and control strategies to mitigate such geological disasters. Pile-anchor structures can overcome the problems of the excessive pile body bending moment and limited slope reinforcement range when the slope is separately reinforced by a single pile and anchor. In this paper, a refined dynamic centrifuge shaking table test was performed on a rock slope reinforced by a pile-anchor structure based on the non-linear characteristics of the rock-soil structure and the mechanical parameters. The elevation amplification effect of the peak ground acceleration is analyzed from the perspective of the time history and frequency spectrum, which fully reveal the synergistic mechanism of the pile-anchor reinforcement system. The failure evolution process of anchor tensile failure and trailing edge cracking occur alongside overall sliding is revealed by assessing the seismic response of the acceleration, displacement, anchor tension, pile bending moment and soil pressure under multi-level seismic loading conditions. The results prove that pile-anchor structures significantly reduce permanent displacement and enhance the stability of slope, and further provide data and theoretical support for slope seismic design using pile-anchor reinforcement, which can effectively protect human safety and property in earthquake-prone areas.