A Quantitative Monitoring Approach for Assessing Tunnel Safety ...

Using a Strain-Based TechniqueSpeaker: Dr. Si-hyun Park,Project Manager, Tunnel Division,
Korea Infrastructure Safety & Technology Corporation.
Goyang-City, Kyunggi-Province, KoreaABSRACT:This presentation discusses a method for the safety assessment of tunnel structures by using the values of measured displacements. Unlike stress measurements, the displacement measurements during the construction of a tunnel have advantages such as simple instrumentation, easy measurements (daily measurements), and economic efficiency. The safety of tunnels has been previously evaluated by using empirical control criteria for the displacement in the construction of tunnels. However, these control criteria have not been validated and do not provide consistent information during the construction phase of tunnels. This presentation introduces the concept of the critical strain for tunnel safety assessment by measuring the displacement instead of the stress-based values. The basic concept behind the critical strain approach was proposed several years ago. However, the concept of critical strain has not been widely applied in the field of the tunnels because until now the concept has not had a convincing engineering interpretation either at the theoretical or the mathematical level. The aim of this presentation is to: (1) compare and collect the control criteria to be used as tools for the measurement and management of the construction of a tunnel, (2) provide an overview the engineering interpretation of the critical strain, using results from prior studies, (3) verify the engineering interpretation of the critical strain, and (4) assess tunnel safety quantitatively by using the measured displacement values. It will be shown that the concept of critical strain can be validated by physical interpretation and be subsequently applied for the safety assessment during the construction of tunnels.

Location: Kaprielian Hall (KAP) - 209 (on WebEx)

Audiences: Everyone Is Invited

Contact: Evangeline Reyes