Prado Flood Basin

Project The USACE enlarging the flood control basin and building a dike to enhance flood risk management at Prado Dam. The basin is designed to accomodate a 200-year event. Monitoring Requirement Engineers needed to monitor settlement, total pressure, and pore-water pressures. Implementation GEO installed a wireless, solar-powered logger, three settlement cells, an earth-pressure cell, and…

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Inclinometer training

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 jacking a 42-inch gas line under existing structures at Aviation Boulevard. Monitoring Requirement GEO-Instruments was contracted to provide drilling, borehole logging, instrumentation supply, installation, commissioning, and training for…

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Monitoring ground improvement

Project To consolidate foundation soil for a large warehouse facility in California, Keller installed wick drains and followed up with deep dynamic compaction and surcharging. Monitoring Requirement Monitoring the progress of consolidation required easy access to continuous measurements of pore-pressure and settlement. Implementation Vibrating wire piezometers were installed across the site. GeoCloud wireless nodes placed at the…

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Hydrostatic Settlement Cells on warehouse wall

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, 10 GeoCloud tiltmeters to monitor any outward rotation of the walls, and 3 vibrating-wire crackmeters with GeoCloud VW Nodes to monitor cracks in the wall. Implementation All instruments were automated so that the…

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Infrastructure Monitoring

Seattle, WA GEO monitored Sound Transit assets and an SPU water line during ground improvement work on an adjacent property. Instrumentation included automated vibration monitors for the water line and an AMTS system to monitor the Sound Transit assets.

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Settlement and Tunnelling

Bellevue Tunnel, WA.  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 and LidLink antennas transmitted measurements to a GeoCloud…

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Monitoring bridge piers - 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 and resumed work. Continuous…

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Settlement Oil Storage Tanks

Project Overview 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 with sensors enclosed…

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Dulles Airport

Project Overview Construction of the Automated People Mover at Dulles International Airport involved deep excavations and tunneling. GEO-Instruments monitored excavation support systems to provide early warning of movement and taxiways for possible settlement due to tunneling. Together, there were 450 IPI sensors and 70 wireless rod-extensometers, data loggers, and web-based monitoring. Monitoring the Excavation-Support System…

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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 nearly 6 miles…

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