ESTIMATION OF PARAMETERS IN GEOTECHNICAL BACKANALYSIS .2. APPLICATIONTO A TUNNEL EXCAVATION PROBLEM

A general statistical framework to perform backanalysis in geotechnica l problems from field instrumentation has been presented in a companio n paper. Here, an application to a real case involving the excavation of a tunnel in stiff overconsolidated clay is described. Both, extenso meter and inclinometer measurements are used as input data and elastic moduli of the ground and the value of the K-0 coefficient are estimat ed. The finite element method is used as the computational procedure t o solve the direct problem, and has been coupled to the identification algorithm as described in the companion paper. In addition, a discuss ion on the reliability of the parameters identified is presented.