Abstract: The aim of this study is to obtain the anchorage mechanism of pressure cable under earthquake more accurately. Considering the damped forced vibration characteristic of the single freedom degree system, we derived the compressive stress and shear stress expressions of the grout of anchorage section of pressure anchor cable based on the basic solution of Mindlin. The influences of harmonic load amplitude, harmonic load circular frequency, and damping ratio on the reinforcement effect of pressure anchor cable are examined through an example. The results show that the amplitude and circular frequency of harmonic load have a greater influence on the reinforcement effect of pressure anchor cable, while the damping ratio of low damping system has little effect. Harmonic load amplitude has a linear relationship with compressive stress and shear stress of grout in anchorage section. When the circular frequency of harmonic load is closer to the damped natural circular frequency of the pressure anchor cable, the compressive stress and shear stress of grout in anchorage section are larger. The research finding offers a theoretical reference for rock-soil reinforcement with pressure anchor cable under earthquake.

Key words: geotechnical engineering, pressure anchor cable, anchorage mechanism, Mindlin solution, harmonic load