Current seismic design specifications for reinforced soil retaining walls primarily derive horizontal seismic coefficients from a limited set of model tests or numerical simulations

without considering the influence of facing type on acceleration amplification coefficient distribution. To address this gap

three sets of shaking table tests were conducted on reinforced soil retaining walls with different facing types

using identical soil and geosynthetic materials. The aim was to investigate the frequency-domain distribution of acceleration responses and the effect of facing type on the acceleration amplification coefficient. The test results show that the reinforcement materials significantly improves soil stiffness and integrity

enhancing the amplification of seismic wave components at both low and high frequencies. The acceleration amplification coefficient increases with height along the wall

and the facing type significantly influences its distribution. Specifically

for wrapped retaining wall with low facing stiffness

the acceleration amplification coefficient decreases as peak acceleration increases

reaching a maximum value of 1.69. In contrast

for modular and integral retaining walls with higher facing stiffness

the acceleration amplification coefficient increases with peak acceleration

reaching the maximum values of 1.84 and 1.37

respectively. Based on these findings

this paper proposes a method for calculating the horizontal seismic coefficients of reinforced soil retaining walls with different facing types using the quasi-static method. The results provide valuable insights for seismic stability analysis of reinforced soil retaining walls.