The Benefits of Uncertainty and Risk Assessment Studies on the M5 Metro Line (Istanbul - Turkey)

Uncertainty is often the most significant source of risk associated with a project in tunnel and underground construction. Unforeseen uncertainties can lead to construction problems leading reduced advances delays, cost increases, damage existing infrastructure and/or building equipment. The M5 metro line, which subject study, located Uskudar – Umraniye - Cekmekoy Sancaktepe district on Asian side Istanbul. line approximately 17.5 km long has 16 cut cover stations. was used four earth pressure balance (EPB) boring machines. effect uncertainty assessment decision-making increasingly given priority, particularly for large projects such as tunnels where primary risk. This article intended explain tangible benefits stakeholders, local authorities, designers, practitioners researchers.