Page 226 - Numerical Analysis and Modelling in Geomechanics

PARAMETER ESTIMATION USING EXTENDED BAYESIAN METHOD 207
installation of the measurement system. The method to estimate the unbiased
values from observed data will be discussed in the section ‘Treatment of
measured displacements’.

Selection of model parameters
Ground motion in underground structures depends on geotechnical parameters
such as elastic modulus (E), initial horizontal stress coefficient (K ), mass density
o
(γ), Poisson’s ratio (v), cohesion (c), and internal friction angle (ф). This is the
case where the Mohr-Coulomb criterion is used as a failure criterion. If the Hoek-
Brown criterion is used, strength parameters c and ф should be replaced by m
and s (Hoek and Brown 1980).
Assuming the mass density and Poisson’s ratio constant and adopting the Mohr-
Coulomb model, the model parameter vector and mean vector p are expressed
as follows:

Figure 7.1 Framework for the feedback system.