The primary objectives of tunneling and infrastructure projects revolve around completing
the project while meeting the required quality standard, within the specified time frame
and adhering to the allocated budget Tunneling projects, given their substantial scale, are
particularly vulnerable to financial losses resulting from delays in completion. Additionally,
inaccurate cost estimations during the planning stage can lead to significant financial
setbacks and, in some cases, even bankruptcy among project participants. It is equally important
to consider the financial repercussions of necessary repairs or corrective actions
due to quality issues during the planning- and construction phases.
In this work, carried out as a PhD project at the Division of Soil and Rock Mechanics,
KTH Royal Institute of Technology, Stockholm, a conceptual risk model has been formulated
specifically for the purpose of enhancing time and cost estimations in tunneling
projects. This risk model serves as a tool to scrutinize and contrast existing probabilistic
time and cost estimation models for tunnel projects, aiming to identify potential areas for
improvement.
The doctoral student Mohammad Mohammadi was supervised by Johan Spross, Stefan
Larsson, Fredrik Johansson, and Anna Kadefors, all at KTH. The members of the reference
group were Peter Lundman, Miriam Zetterlund, Claes Mellqvist, Johan Brantmark,
Robert Sturk, Stig Eriksson, Gösta Ericson, Håkan Stille, Per Tengborg and Patrik Vidstrand
and the research project was funded by BeFo, Formas (grant 2017-01218) and
KTH.

Stockholm
Patrik Vidstrand