ABSTRACT
By incorporating the engineering properties manifested by performing in-situ and laboratory tests which included the variation of clay stiffness with depth and strain, a practical FE analysis was carried out to predict the short-term deformation behavior of Diaphragm wall around the R-station of northern line of Bangkok Metro which were pre-installed 35 m deep in the dense sand layer through soft as well as stiff clay layers of 22 m thick. Simulation of laboratory tests (1-D incremental consolidation and undrained triaxial shearing) was also made to see the effects of elastic stiffness at various strain ranges. It has been found that the use of the elastic Young’s modulus, E’ equal to half of Ε ′max from the in-situ seismic survey enhances the accuracy of deformation prediction of deep excavation work in soft clay irrespective of the elastic or elasto-plastic constitutive model used.
