To access the full text documents, please follow this link: http://hdl.handle.net/2117/2208

Estimation of Parameters in Geotechnical Backanalysis: I. Maximum Likelihood Approach
Ledesma Villalba, Alberto; Gens Solé, Antonio; Alonso Pérez de Agreda, Eduardo
Universitat Politècnica de Catalunya. Departament d'Enginyeria del Terreny, Cartogràfica i Geofísica
The estimation of soil and rock parameters based on field instrumentation data is a common procedure in geomechanics. The use of system identification and optimization techniques allows the performance of this type of analyses in a more rational and objective manner. In this paper a probabilistic formulation for the backanalysis problem is presented. The procedure described involves the evaluation of the measurement covariance matrices, which are derived for some geotechnical instruments used in field instrumentation. The algorithm used to solve the mathematical problem of optimization is also presented, as well as its coupling to a finite element code. The algorithm requires the computation of the sensitivity matrix, which can be evaluated “exactly” in terms of the finite element method. Finally, a synthetic example, based on the excavation of a tunnel, is presented in which the elastic modulus E and the Ko parameter of the material are identified from measured displacements. The effect of the number of measurements and their error structure is also discussed.
Peer Reviewed
Rock mechanics--Mathematical models
Soil mechanics--Mathematical models
Probabilities--Mathematical models
Parameter estimation
geotechnical parameters
probabilistic methods
Probabilitats -- Models matemàtics
Paràmetres (Matemàtica) -- Identificació
Mecànica dels sòls -- Models matemàtics
Mecànica de roques -- Models matemàtics
Article
Elsevier
         

Show full item record

Related documents

Other documents of the same author

Ledesma Villalba, Alberto; Gens Solé, Antonio; Alonso Pérez de Agreda, Eduardo
Gens Solé, Antonio; Ledesma Villalba, Alberto; Alonso Pérez de Agreda, Eduardo
Ledesma Villalba, Alberto; Lloret Morancho, Antonio; de Santos, C.; Ramos, Gonzalo; Alonso Pérez de Agreda, Eduardo; Vázquez Suñé, Enric; Pujades Garnes, Estanislao; Carrera Ramírez, Jesús
Alonso Pérez de Agreda, Eduardo; Josa Garcia-Tornel, Alejandro; Ledesma Villalba, Alberto
de Santos, C.; Ledesma Villalba, Alberto; Lloret Morancho, Antonio; Alonso Pérez de Agreda, Eduardo
 

Coordination

 

Supporters