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
Estudo da estabilidade de valas escoradas por equilíbrio-limite e pelo método dos elementos finitos
Este trabalho aborda o comportamento de escavacoes escoradas atraves de diferentes metodos. O Capitulo 2 contem uma revisao bibliografica de metodos expeditos e de equilibrio-limite para analise de estabilidade de escavacoes e do Metodo dos Elementos Finitos. No item referente aos metodos de equilibrio-limite introduziu-se, adicionalmente, uma proposicao para calculo do fator de seguranca de escavacoes levando-se em conta o efeito estabilizante das estroncas atraves do Metodo de Bishop Simplificado. O Capitulo 3 contem um estudo parametrico utilizando-se o Metodo de Bishop Simplificado (equilibrio-limite), bem como uma comparacao dos fatores de seguranca fornecidos por este metodo e os obtidos atraves de proposicoes de Terzaghi e Tschebotarioff (metodos expeditos). No Capitulo 4 faz-se um estudo parametrico de escavacoes escoradas pelo Metodo dos Elementos Finitos, utilizando-se o modelo elastico linear, e tambem comparacoes dos fatores de seguranca a ruptura global obtidos com base neste metodo e pelo Metodo de Bishop Simplificado. No Capitulo 5 faz-se a simulacao do comportamento da escavacao de um trecho do Metro do Rio de Janeiro pelo Metodo dos Elementos Finitos, utilizando-se o modelo elastico nao linear.
AN INTRODUCTION T O THE SOILS OF THE SOUTH-EASTERN PORTION OF THE AUSTRALIAN ARID ZONE
Summary 
 
Seven soil regions, each of which is dominated by soils belonging to one or two great soil groups, are defined and mapped. The outstanding feature is the presence of a variety of soils with widely differing characteristics. The soils are deeper, have more profile differentiation and are finer-extured than those in most-arid regions and are frequently overlain by currently-forming deposits of wind-transported materials. Because the vegetative cover is better developed and there are only small areas of rocky hills and bare rock pediments, water erosion and deposition are not as prominent as in other arid areas.