Risk Assessment of Voids behind the Lining of Mountain Tunnels

Accidents caused by lining damage are commonly faced problems of tunnels. These accidents may have detrimental effects on drivers and cars in the form of injury, disability, etc. One of the main causes of lining damage is void behind the lining. This study proposes a risk evaluation methodology for assessment and management of risk associated with void behind lining. In the proposed methodology, risk assessment requires the determination of probabilities and possible consequences. In order to define probability, a statistical method is used; and to define consequence, a finite element analysis is carried out; finally, the proposed method is illustrated with an example and it is found to be useful to evaluate and manage such risks.