Real-Time Monitoring for Very Shallow Tunneling in Urban Settings

Synopsis:

Implementation of “Real-Time” monitoring at Tysons Corner was a success for multiple reasons. The “Real-Time” monitoring not only assisted in ensuring public safety during tunnel excavation, but contributed greatly to the safety of those working in the tunnels through immediate recognition of excessive surface settlements. Without the monitoring program, the construction team would lose valuable insight into the behavior of the ground during excavation and the success of the pre-support and initial support systems. Such information is critical to making any changes to means and methods, which in the case at Tysons Corner was not required. Additionally, “Real-Time” monitoring and open sharing of the information with the Owner and permitting agencies contributed to an open working relationship and alleviated concern regarding the very shallow tunneling beneath a critical road.

This project is a prime example of successful implementation of SEM tunneling in a very shallow urban environment through soft ground. The monitoring program played a large role in ensuring the success of the project, while ensuring public safety, and should be a prime example for future similar SEM tunnels in the United States.

Real-Time Monitoring for Very Shallow Tunneling in Urban Settings
2012 North American Tunneling Conference Proceedings
June 24-27, 2012
Indianapolis, Indiana