Abstract: According to the theory that the internal and external friction angles of the soil are gradually exerted with the displacement of the soil, the displacement mode around the bottom of the wall, and the influence of the seismic force on the earth pressure are comprehensively considered. The horizontal layer analysis method is used to derive the theoretical formula of wall seismic active earth pressure along the wall height distribution, resultant force and joint force height. The effects of the displacement of the wall and the seismic acceleration coefficient on the earth pressure distribution, the most dangerous slip surface inclination angle, the combined force point height and the active side soil are analyzed. The analysis results show that the soil pressure intensity is nonlinearly distributed. After simplifying, the obtained combined force of active earth pressure is the same as the result of the Mononobe-Okabe theory. The slip angle of the slip surface decreases with the increase of the seismic coefficient, as does the combined force of active earth pressure, while the active lateral earth pressure coefficient increases with the wall back inclination angle and seismic coefficient. The finite element simulation proves that the variation trend of the soil pressure distribution curve obtained by the simulation is basically consistent with the calculated results.

Key words: retaining wall, earthquake, horizontal layer analysis, active earth pressure