Project Objective
Clark-Atkinson-Technique Joint Venture has designed and is constructing a 900-foot tunnel extension of the existing Plane Train automated people-mover system at the Hartsfield-Jackson Atlanta International Airport in Atlanta, Georgia. The project entailed constructing a vertical shaft and performing tunneling work beneath both the existing terminal and the MARTA and SkyTrain systems.
Geosyntec’s Scope of Services
Geosyntec installed and monitored geotechnical instrumentation during construction to monitor ground movements and structural health associated with shaft construction and tunneling. Inclinometers were used to monitor lateral deformations during shaft construction, with automated readings reported each hour. Before tunneling, the vibrating wire piezometers were implemented to monitor water levels and verify dewatering. Several automated motorized total stations were deployed to achieve coverage of monitoring points throughout the site during construction. Ground subsidence along the tunnel centerline was evaluated and monitored using a combination of ground-monitoring points, utility-monitoring points, and multi-point extensometers.
Structural health of existing structures, including the SkyTrain system, was monitored using seismographs for vibration and noise during blasting. Structural monitoring points and tiltmeters were also used, since the tunnel alignment passes directly underneath these structures.
Notable Accomplishments
Geosyntec team developed, configured, and deployed a geotechnical instrumentation monitoring system (GIMS) to provide real-time data access to the project team. The GIMS provides a single authoritative repository of geotechnical instrumentation data using a secured website from which the team can access project data immediately after the data is collected and posted to this website. The GIMS is accessible on mobile devices and provides data in graphical and tabular format and allows automatic notifications of exceedances.
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Project Summary
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Project Objective
Clark-Atkinson-Technique Joint Venture has designed and is constructing a 900-foot tunnel extension of the existing Plane Train automated people-mover system at the Hartsfield-Jackson Atlanta International Airport in Atlanta, Georgia. The project entailed constructing a vertical shaft and performing tunneling work beneath both the existing terminal and the MARTA and SkyTrain systems.
Geosyntec’s Scope of Services
Geosyntec installed and monitored geotechnical instrumentation during construction to monitor ground movements and structural health associated with shaft construction and tunneling. Inclinometers were used to monitor lateral deformations during shaft construction, with automated readings reported each hour. Before tunneling, the vibrating wire piezometers were implemented to monitor water levels and verify dewatering. Several automated motorized total stations were deployed to achieve coverage of monitoring points throughout the site during construction. Ground subsidence along the tunnel centerline was evaluated and monitored using a combination of ground-monitoring points, utility-monitoring points, and multi-point extensometers.
Structural health of existing structures, including the SkyTrain system, was monitored using seismographs for vibration and noise during blasting. Structural monitoring points and tiltmeters were also used, since the tunnel alignment passes directly underneath these structures.
Notable Accomplishments
Geosyntec team developed, configured, and deployed a geotechnical instrumentation monitoring system (GIMS) to provide real-time data access to the project team. The GIMS provides a single authoritative repository of geotechnical instrumentation data using a secured website from which the team can access project data immediately after the data is collected and posted to this website. The GIMS is accessible on mobile devices and provides data in graphical and tabular format and allows automatic notifications of exceedances.
- Location: Atlanta, Georgia
- Client: 2MATL/Clark-Atkinson-Technique
- Project Practice Areas: Geotechnical
- Services Provided: Geotechnical instrumentation installation; automated total station monitoring; vibration monitoring; real-time alerts and notifications; data management and reporting
