Theoretical Model of Shield Behavior During Excavation. II: Application

Abstract

Simulation of the shield behavior is carried out by applying the model of the loads acting on the shield to the shield tunneling work. The shield tunneling was carried out using an earth pressure balanced shield in sandy gravel layer entirely and the observed data were obtained by the real time measuring data system. To escape the errors of data, the filtering process is applied to the measured data prior to processing the simulation. The input ground properties are carefully determined from the two-dimensional finite element analysis, reverse analysis, and empirical values. The simulation results are compared with the observed data to verify the model performance. The results indicate that; (1) the ground loosening due to local collapse of the ground at the shield face and at the shield crown are necessary to take into consideration in order to simulate the actual shield behavior; (2) the force due to the deformation of wire brush affects the shield postures; and (3) the simulation results are in good agreement with the observed data.