The evaluation of seismic earth pressures is of vital importance for the earthquake resistant design of variousretaining walls and infrastructures. It is one of the key research subjects in soil mechanics and geotechnical engineering.In engineering practices, the magnitude and distribution of seismic earth pressures are greatly affected by the mode andamount of wall displacement. However, classic Mononobe-Okabe solution can only compute the seismic earth pressuresat the limit state and doesn’t consider the effect of the mode and amount of wall movement on the seismic earth pressure.In this paper, the formation mechanism of earth pressures against rigid retaining wall with RTT and RBT mode isrevealed based on the previous studies and a new method is proposed to calculate the seismic earth pressures in suchconditions. Corresponding formula are derived and computer code is written to calculate the seismic earth pressuredistribution based on the proposed methodology. Variation of seismic earth pressure coefficient for the rigid retaining wallwith RTT and RBT mode is calculated and discussed. In addition, the effectiveness of the method is confirmed by theexperimental results.
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