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Recently attension is being directed toward developing a numerical procedure whose objective is to determine a set of parameters from a set of observed displacements at the field. The procedure, so called “Identification or Inverse” problem, is general and can be applied to any geotechnical problems, in which the system parameters are to be identified. In this paper, the method to identify the elastic constants and geometry characteristics of inhomogeneous rock masses is presented. Elastic parameters are calculated by the optimization process in mathematical programing. Geometry characteristics are determined by Akaike's information criterion (AIC) which estimates the maximum likelihood of the system. Several examples of tunnel problems with loosend area are examined and evaluated by the proposed method.

FUNDAMENTAL STUDY ON IDENTIFICATION OF ELASTIC CONSTANTS AND GEOMETRY CHARACTERISTICS OF INHOMOGENEOUS ROCK MASSES