Abstract
The authors had proposed the back analysis method for the estimation of earth pressure or coefficient of subgrade reaction in excavation work, using the extended Kalman filter of control theory. In case of simultaneous estimation of earth pressure and coefficient of subgrade reaction, this procedure is unstable.
This paper describes the new back analysis considering moment of retaining wall and the external forces as the observation vector for the observation equation. Using this method, earth pressure and coefficient of subgrade reaction can be easily identified and the convergence is developed.
