Abstract Tunnelling has been used for several purposes for thousands of years. In the coming years the world's population will increase in the urban areas. So, the urban centres will have to adapt, in order to guarantee that their future population will have the necessary and sustainable growth. Due to the constraints for surface construction, also connected to environmental issues, this population growth will imply a greater use of the underground. With this optimal growth, the population of the cities will have better mobility, quality of life, and economic and social sustainability. In a first phase, this report will present a historic approach to tunnelling and its foreseeable future. Afterwards, we will present some considerations on the three factors which tunnelling impacts: mobility, quality of life and social sustainability. As a case study, we will analyse the 2nd phase of the construction of the Marão Tunnel (TDM) - the longest ever built in the Iberian Peninsula- and describe the options made regarding each of those factors. In this case study, the options implemented made it possible to successfully execute the works. For the industry, this work is important because it describes a successful management of the aspects under analysis.

Este artigo analisa três projetos internacionais de regeneração urbana sustentável. Esta análise baseou-se na aplicação de dez indicadores de sustentabilidade urbana através de dois instrumentos de avaliação de sustentabilidade (Sistema Português de Avaliação da Sustentabilidade de Operações de Planejamento Urbano - SBToolPT-PU, e Sistema Internacional de Avaliação da Sustentabilidade de Operações de Planejamento Urbano - SBTool Urban) que estão sendo desenvolvidos em Portugal e em nível internacional, respectivamente. Através desta análise, pretendeu-se identificar as melhores práticas para o desenvolvimento urbano sustentável, as quais permitirão a definição dos valores de referência para ambas as ferramentas, apoiando os projetistas na tomada de decisão, considerando a sustentabilidade de áreas urbanas novas ou regeneradas.

This paper analyses three international sustainable urban regeneration projects. The analysis was based on the application of ten urban sustainability indicators from two sustainability assessment tools (Sustainable Building Tool for Urban Planning in Portugal - SBToolPT-UP, and International Sustainable Building Tool for Urban Planning - SBTool Urban), which are being developed in Portugal and at international level, respectively. Based on that analysis, the aim of this paper is to identify best practices for sustainable urban design, which will allow the definition of benchmarks for both tools, in order to support designers in decision-making regarding the sustainability of new or regenerated urban areas.