Parameter estimation using extended Bayesian method in tunnelling

Effort was made in this paper to formulate a parameter estimation technolog y by systematically combining the field measurements and the prior informat ion of underground structure. The Extended Bayesian Method (EBM) was adopte d for the feedback analysis and the finite element analysis, which was impl emented to predict the ground response. Determined in the present study wer e various geotechnical parameters including the elastic modulus (E), the in itial horizontal stress coefficient at rest (K-0), the cohesion (c) and the internal friction angle (phi). The validity of the feedback system propose d herein was demonstrated through an elastoplastic example problem. The pro posed method was applied to an actual tunnel site in Pusan, Korea and has s hown to be highly effective in actual held problems. (C) 1999 Elsevier Scie nce Ltd. All rights reserved.