Soluções de Escavação e Contenção Periférica em empreendimento no Parque das Nações, em Lisboa

Maria José Machado Oliveira

Key information

Authors:

Maria José Machado Oliveira (Maria José Machado Oliveira)

Supervisors:

Alexandre da Luz Pinto (Alexandre da Luz Pinto)

Published in

November 13, 2024

Abstract

Urban areas are increasingly limited, leading to a rise in land value, which, in turn, demands a more efficient and effective use of space. This approach is driven not only by space scarcity but also by the increased functional and regulatory demands associated with modern buildings, such as the creation of technical zones and the inclusion of parking facilities, among others. This dissertation addresses the case study of a construction project located in Parque das Nações. The study area presented soil contamination issues, adding complexity and additional challenges to the project implementation. This contamination requires rigorous soil management, disposal, and treatment processes to prevent pollution from spreading to uncontaminated soils. The case study involves the construction of an office building named WellBe - Expo 1.11, for which the adopted peripheral earth retaining structure solution was a secant pile wall, including support structures with ground anchors and corner steel struts. This study analysed the methodologies and effective practices used in excavation and soil management for the case study, identifying potential improvements to optimise these processes. The chosen solution for peripheral earth retaining structure, excavation, and soil management relied on multiple borehole investigations, followed by an analysis and characterisation of the ground. Throughout the project, an instrumentation and monitoring plan was implemented, enabling the analysis of multiple elements, correlations between them, and potential causes of variations detected across the instruments. Due to site constraints, structural reinforcement measures were necessary.