DEFORMATION ANALYSIS OF EARTH-RETAINING WALL DURING EXCAVATION OF NAKANOSHIMA SOFT CLAY DEPOSIT BY AN ELASTO-VISCOPLASTIC FINITE ELEMENT METHOD

Abstract

  As part of the construction of a new subway line in Osaka, Japan, called the Nakanoshima Line, a large and deep excavation has been successfully carried out by the open-cut excavation method with two earth retaining walls through the thick Holocene Nakanoshima clay deposit. In the present study, a case history of the excavation is numerically back analyzed via a viscoplastic finite element method. A comparison between the simulation results and the measurements shows that the simulation method can efficiently reproduce the deformation of earth retaining walls. In particular, the modified measured deformation of the earth-retaining wall by the measured axial force of the struts is consistent with the simulated results.