Construction Monitoring
Real-time data to evaluate construction effects on tunnels and excavations
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The Challenge
- Control excavation and tunneling work with minimal impact on surrounding structures
- Assess design for safety
- Verify structural performance
Los Angeles Metro awarded the $1.3 billion contract to Walsh/Shea Corridor Constructors (WSCC) to build the Crenshaw/LAX Transit Corridor Project, an 8.5-mile light rail that runs between the Expo Line on Exposition Boulevard and the Metro Green Line at LAX Airport. It included eight new stations, five at grade level and three cut-and-cover braced excavations.
The Solution
Geocomp provided instrumentation and monitoring for over one mile of twin bored tunnels, three cut-and-cover/station excavations, and one low excavation location. Geocomp’s iSiteCentral® integrated data from more than 2,000 sensors, including automated MPBXs, inclinometers, strain gages, and tilt meters with settlement measurements and performance data from the contractor’s Tunnel Boring Machine (TBM) and Automated Motorized Total Stations (AMTS).
iSiteCentral® also incorporates installation documentation and photos into the database to better centralize all instrumentation information and make it readily accessible for reporting and review.
Geocomp focused on the open cut excavations directly adjacent to heavy commercial activity and interconnected with twin-bored 20-ft diameter tunnels, which run 60-ft directly below Crenshaw Boulevard. The construction activity is continuously monitored to help the contractor control excavation/tunneling work and to mitigate risk of unexpected movement to adjacent buildings and utilities.
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