Risk management associated to desing and construction of T.B.M tunnel linings with precast segments
Tutor / director / evaluatorAinchil Lavín, Javier Pablo
Document typeBachelor thesis
Rights accessOpen Access
Construction of tunnels has much progressed over the last decades regarding methods, technology and materials in both the TBM and the tunnel lining. All construction carries risks, not only during construction but also in operation, which must be considered properly in design and monitored all across the project. Risk management is currently used as a systematic approach to project management. Risk management strategies help to identify and evaluate risks, defining also risk mitigation strategies and even contingency measures if the risks are finally materialized. Risk management in civil engineering is a work philosophy which has been much developed in recent years. In international projects its use is common, but it is not widely known in our technical environment. The development of the risk management in tunnels has been focused mostly in the risks associated with the excavation of the tunnel, based on the high uncertainties on the ground properties. In others aspects it has been focused on the strong impacts in front of accidents, financial and schedule deviations. With the high development in technology and the improved construction methods, tunnel construction with TBM is able to minimize or mitigate risks, as well as to avoid some of them. Ii is still needed a comprehensive assessment of all the risks that a project can carry out. Consequently a first review of the state of the art of both risk management and TBM tunnel design and construction is provided. This thesis focuses in the practical application of risk management approach to a real project tunnel recently constructed in the Middle East with the involvement of several Spanish engineers’ experts in the fields of the design and construction of tunnels as well as from the academia. Several meetings took place and a survey template was prepared and submitted to the experts in order to identify risks. After the risk responses, a risk register was created and several systematic analyses were performed. As a result of this necessary analyse, the main risks related to the design and the construction of TBM lining were defined. A second round of discussions with a reduced number of specialists is made in order to obtain feedback and fine tune the final results. Conclusions obtained refer both to the management of the process and to the risks involved in both the design and construction stages. Given the relevance of the information obtained thanks to the surveys performed, several newlines of work have been detected which refer to critical aspects to be considered in future research.