Numerical Analysis of Dry Excavation Using a Tie Back Wall Under Static and Dynamic Load
Deep excavations are common in urban areas, nearby existing constructions. The support systems have the main function of preserve the stability and control soil displacements close to the excavation. Settlement control of nearby structures is an essential aspect during design and construction. Settlements prediction is usually made by empirical methods and in some cases also by numerical modeling. The paper presents a numerical modeling of a dry excavation by Plaxis program. The program allows the prediction of stress and deformation behavior of different geotechnical constructions using the Finite Element Method. The excavation has been modeled in five stages, in order to reproduce the construction phases. The numerical modeling was capable to reproduce satisfactorily the horizontal profile of the displacements of the diaphragm wall. In relation to settlements, the shape of the settlement profile was quite similar
The behaviour of a propped retaining wall: results of a numerical experiment
The design of propped retaining walls is currently based on approximate limit equilibrium calculations. A factor of safety is used to ensure adequate stability and to restrict soil and wall movements to acceptable levels. No distinction is made for the type of construction, whether excavated or backfilled, or of the stress state in the soil prior to construction. In this Paper the finite element method is employed to investigate the influence of type of construction and of initial stress in the soil on the behaviour of single propped retaining walls. An elasto-plastic constitutive law is used to model the soil behaviour and a rigid prop is assumed to act at the top of the wall. The results of the investigation indicate that for excavated walls in soils with a high initial K0 value prop forces and wall bending moments greatly exceed those predicted by current design methods. In addition large soil and wall movements are experienced even at shallow depths of excavation. The behaviour is dominated by the ver...
Food security among asylum seekers in Melbourne
Objectives: This research explores food insecurity among asylum seekers who are members of the Asylum Seeker Resource Centre (ASRC) in Melbourne, Australia.