Geotechnical parameter identification of no-tension elastic–plastic model using extended Kalman filter

摘要

In this study, a probabilistic procedure is presented for determination of the mechanicalnparameters of rock mass around a tunnel accounting for measurement uncertainties. Thenformulation of the inverse problem allows the incorporation of both the field measurements andnthe prior information. In the method, a non-linear finite element (FE) method for analysing thendirect problems of tunnelling in a jointed rock mass with no-tension elastic–plastic behaviour isncoupled with the extended Kalman filter (EKF) to modify the geotechnical parameters in anstatistical context. The validity of the back-analysis system was demonstrated through a syntheticnexample of a deep tunnel in a yielding rock mass. The results show the fast convergence and thengreat potential of the proposed procedure.