settlement
Microtunneling at LAX
Microtunneling at LAX Project The LAMP project at LAX in California is a multi-billion dollar program for modernizing access to and from the airport. One part of the project involved installation of 9,700 feet of 48-inch diameter earthquake-resistant pipe within the City of LA street rights of way. Cut and cover was used for most…
Read MoreStorage Facility
Settlement of Storage Facility Project This tilt-up constructed storage facility experienced cracks, settlement, and movement of walls. Monitoring Requirement: Monitoring required 10 hydrostatic level cells to monitor settlements, and a node-and-gateway network consisting of 10 wireless tiltmeters to monitor any outward rotation of the walls and 3 crackmeters with wireless VW Nodes to monitor cracks…
Read MoreLight Rail & Utilities
Light Rail & Utilities Project GEO monitored Sound Transit assets and an SPU water line during ground improvement work on an adjacent property. Instrumentation Instrumentation included automated vibration monitors for the water line and an AMTS system to monitor the Sound Transit assets.
Read MoreTunnelling & Settlement
Tunneling & Settlement Monitoring The Bellevue tunnel was aligned with a major thoroughfare. To monitor possible settlements, GEO-Instruments installed borehole extensometers above the tunnel centerline and arrays of road prisms across the road. Photo shows installation of a road prism. Borehole extensometers were terminated flush with the surface using a LidLink antenna. Measurements were transmitted…
Read MoreHernando de Soto Bridge
Hernando de Soto Bridge Project Overview The Hernando de Soto bridge, first opened in 1973, carries I-40 traffic across the Mississippi river. During a seismic retrofit, sudden settlement of a pier supporting an approach bridge, forced temporary closure. The pier had settled 5 inches in three days. After evaluating the failure, engineers revised construction methods…
Read MoreOil Storage Tanks
Recommissed Oil Storage Tanks Project Before an an oil storage facility could recommission some retired tanks, plant engineers engineers had to address concerns about the pile foundations of these tanks. Specifically, they needed early warning of settlements or differential movement of the tank foundation as the tanks were filled. GEO-Instruments provided a real-time monitoring system…
Read MoreDulles Airport
Dulles Airport Work 2003 The Automated People Mover project at Dulles International airport involved nearly two miles of tunneling. Large excavations were required for stations at the main terminal and the three mid-field terminals. The station at the main terminal involved a 50-foot cut and extensive underpinning of the terminal. Monitoring Requirements Monitor support of…
Read MoreLA Outfall Sewer
LA Outfall Sewer Project Overview The Lower North Outfall Sewer served as one of Los Angeles’ primary wastewater tunnels for more than 70 years, but inspections revealed that the nine-mile long tunnel was at the point of failure at several locations. Corrosion had reduced the original 14-inch thick lining to just a few inches, and…
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