A new modification to Mononobe-Okabe's pseudo-static model for passive earth pressure prediction using homogeneous differential equation

Abstract

Mononobe-Okabe's model is the most commonly used pseudo-static method of estimating seismic lateral earth pressures behind retaining wall worldwide. This method cannot predict the distribution of the lateral earth pressure and the overturning moment accurately. Hence, this research proposed a new modification to the original M-O model using the homogeneous differential equation within the framework of limit equilibrium. The proposed model gives an exact prediction of the M-O model when considering the coefficient of passive earth pressure and different predictions for the distribution of the lateral earth pressure. The point of application of the resultant earth force is found to vary with the input parameters and not fixed at 1/3 of the height of the wall as in the original M-O model. The obtained results are also compared with the analytical and experimental models and they are found to be comparable with them.