Geosynthetic reinforced soil retaining structures (GRSRS) take over the role of the conventional retaining walls step by step and become the mainstream of retaining structures in Taiwan because of the advantages of easy construction, low construction cost, short construction period, better deformation tolerance, earthwork amount balance and good seismic resistance ability, etc. Nonetheless, during the well-known Taiwan 921 Chi-Chi Earthquake, many GRSRS have been destroyed. In order to understand the performance of the seismic behavior of the GRSRS during the earthquake, the finite element program PLAXIS is employed to explore the seismic response of GRSRS. The numerical simulation process focuses on the Young's modulus of soil, the stiffness modulus of the geosynthetic reinforcement, and different magnitude scales of seismic data to perform parametric study. Numerical simulation of GRSRS can predict the maximum acceleration under different conditions under the earthquake by using different parameters, and it is hopeful to provide information for geotechnical engineers during design phase.
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