Risk analysis during tunnel construction using Bayesian Networks: Porto Metro case study

► Unexpected events pose major risks in tunneling. ► Two combined models – a geologic prediction – and a construction management model to assess risk were developed. ► The models were successfully applied to the Porto Metro. This paper presents a methodology to systematically assess and manage the r...

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Bibliographic Details
Published in:Tunnelling and underground space technology 2012, Vol.27 (1), p.86-100
Main Authors: Sousa, Rita L., Einstein, Herbert H.
Format: Article
Language:English
Subjects:
Bayesian Networks
Construction
Geology
Mathematical models
Methodology
Networks
Risk
Strategy
Tunneling
Tunnels (transportation)
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Summary:► Unexpected events pose major risks in tunneling. ► Two combined models – a geologic prediction – and a construction management model to assess risk were developed. ► The models were successfully applied to the Porto Metro. This paper presents a methodology to systematically assess and manage the risks associated with tunnel construction. The methodology consists of combining a geologic prediction model that allows one to predict geology ahead of the tunnel construction, with a construction strategy decision model that allows one to choose amongst different construction strategies the one that leads to minimum risk. This model used tunnel boring machine performance data to relate to and predict geology. Both models are based on Bayesian Networks because of their ability to combine domain knowledge with data, encode dependencies among variables, and their ability to learn causal relationships. The combined geologic prediction–construction strategy decision model was applied to a case, the Porto Metro, in Portugal. The results of the geologic prediction model were in good agreement with the observed geology, and the results of the construction strategy decision support model were in good agreement with the construction methods used. Very significant is the ability of the model to predict changes in geology and consequently required changes in construction strategy. This risk assessment methodology provides a powerful tool with which planners and engineers can systematically assess and mitigate the inherent risks associated with tunnel construction.
ISSN:0886-7798
1878-4364
DOI:10.1016/j.tust.2011.07.003