Showing papers by "Susan Gourvenec published in 1999"

Three-dimensional finite-element analysis of diaphragm wall installation

Abstract: A series of finite-element analyses has been carried out to investigate the impact of three-dimensional effects and panel length on horizontal ground movements and changes in lateral stress during the sequential installation of a number of diaphragm wall panels. The analyses show that the magnitude and extent of lateral stress reduction in the vicinity of a diaphragm wall during construction depend on the panel length and are overpredicted in analyses assuming conditions of plane strain. Furthermore, an overall increase in lateral stress below the toe of the wall is calculated in a plane strain analysis, but is not evident following completion of the wall when a three-dimensional analysis modelling the sequential installation of a number of panels is carried out. The analyses also show that three-dimensional effects tend to reduce lateral soil movements during installation of a diaphragm wall in panels compared with the plane strain case, but soil movements increase markedly with panel length at aspect ra...

Field investigations of long term ground loading on an old tunnel in London Clay

Abstract: This paper presents the results of a field study carried out early in 1998 to investigate the current ground conditions around an old cast iron lined tunnel in London Clay. The eventual loading carried by these tunnel linings is unknown, but concern exists that there may be a gradual increase in loading. with time. Considerable lengths of the London Underground network run through London Clay in tunnels constructed with cast iron segmental linings. The investigation therefore provides information vital to the estimation of the remaining design life of London’s underground transport infrastructure.