A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Safety and Reliability of Tunnel Openings: Dealing with Large Uncertain Data
Theoretically expressed as the ratio of demand to capacity, the Factor of Safety (FoS) is defined to ensure the safety of structures and has been widely used in the deterministic design of underground excavations in rocks. However, FoS alone is inadequate to ensure the stability of tunnel openings. A measure of reliability or probability of failure is needed to account for the uncertainties in ground properties. This research tries to provide a connection between the probability of failure (Pf) and the Factor of safety (FoS), which is a very important guide for determining an appropriate target FoS to be used in tunnel design. A sensitivity analysis is conducted initially to determine which parameters have the most important effects on the determination of safety and reliability. The study considered five correlated randomized parameters, two limit state functions based on convergence and stress, and two generally used reliability methods, the First-order Reliability Method (FORM) and Monte Carlo Simulation (MCS). The result clearly indicated a negative relation between the Pf and the FoS. Moreover, distinct Pf vs. FoS curves were obtained for the two limit state functions, and the differences are attributed to the shapes of the equations and the variables involved. The Pfs for a displacement-based limit state is generally higher than the Pfs for a load-based limit state for the same FoS. This research offers valuable review and insights into a more pragmatic reliability-based design on UTIs by providing FoS for a given Pf.
Safety and Reliability of Tunnel Openings: Dealing with Large Uncertain Data
Theoretically expressed as the ratio of demand to capacity, the Factor of Safety (FoS) is defined to ensure the safety of structures and has been widely used in the deterministic design of underground excavations in rocks. However, FoS alone is inadequate to ensure the stability of tunnel openings. A measure of reliability or probability of failure is needed to account for the uncertainties in ground properties. This research tries to provide a connection between the probability of failure (Pf) and the Factor of safety (FoS), which is a very important guide for determining an appropriate target FoS to be used in tunnel design. A sensitivity analysis is conducted initially to determine which parameters have the most important effects on the determination of safety and reliability. The study considered five correlated randomized parameters, two limit state functions based on convergence and stress, and two generally used reliability methods, the First-order Reliability Method (FORM) and Monte Carlo Simulation (MCS). The result clearly indicated a negative relation between the Pf and the FoS. Moreover, distinct Pf vs. FoS curves were obtained for the two limit state functions, and the differences are attributed to the shapes of the equations and the variables involved. The Pfs for a displacement-based limit state is generally higher than the Pfs for a load-based limit state for the same FoS. This research offers valuable review and insights into a more pragmatic reliability-based design on UTIs by providing FoS for a given Pf.
Safety and Reliability of Tunnel Openings: Dealing with Large Uncertain Data
Springer Ser.Geomech.,Geoengineer.
Gutierrez, Marte (editor) / Liu, Linqi (author) / Gutierrez, Marte (author)
International Conference on Inforatmion Technology in Geo-Engineering ; 2024 ; Golden, CO, USA
2024-11-03
13 pages
Article/Chapter (Book)
Electronic Resource
English
Factor of Safety (FoS) , Limit State Function (LSF) , Reliability , Underground Opening , Monte Carlo Simulation (MCS) , First-order Reliability Method (FORM) Engineering , Geoengineering, Foundations, Hydraulics , Geotechnical Engineering & Applied Earth Sciences , Mathematical and Computational Engineering
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