The International Information Center for Geotechnical Engineers

Monday, 17 April 2017 08:13

Geocomp provides monitoring services to the Parallel Thimble Shoal Tunnel project

The Parallel Thimble Shoal Tunnel project in Virginia involves the construction of a new bored 1-mile, two-lane tunnel under Thimble Shoal Channel next to the existing two-lane Chesapeake Bay Bridge Tunnel (CBBT).

The new tunnel, 42 feet in diameter, will be constructed using a Tunnel Boring Machine (TBM) that will be advanced from the new man-made portal island. Once completed, the tunnel will expand capacity and improve safety for travelers who use the CBBT.


 Geocomp is providing monitoring services for Dragados USA and Schiavone Construction JV for the existing manmade Portal Island and tunnel before construction, as well as the temporary construction element needed to perform the tunneling in this unique environment.

Geocomp's objectives include:

  •  Establishing baseline performance of existing facilities prior to construction in order to differentiate seasonal movement versus construction impacts on the existing tunnel;
  • Providing real-time data to evaluate construction effects on the existing tunnel and minimize risk of damage; and
  • Verifying performance assumptions used in the design of the support of the excavation system

The company will use GIS web-based software, iSiteCentralTM, to provide real-time assessment of construction-related activity. iSiteCentral will integrate data from more than 500 sensors. The instrumentation and monitoring system is vital to:

  • Ensuring the stability of the existing tunnel during construction;
  • Verifying the design performance assumptions of various components; and
  • Minimizing the risk of project delay from unexpected performance.

Project Manager Ryan Drefus shared that “We are honored to be part of the team participating in this unique and challenging project.”

The article is part of Gecomp's Q1 newsletter 2017

Source: Geocomp

Read 598 times Last modified on Monday, 17 April 2017 16:14

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