projects
Slope Stabilization
Slope Stabilization At this slope stabilization project, GEO installed twelve shape arrays at depths from 40 to 90 feet, eight vibrating wire piezometers, and monitoring equipment for dewatering pumps. All of the solar-powered installations sent measurements to Geocloud servers by cell modem. The drone photo at left shows the location of all 12 shape arrays. The site…
Read MoreStructural Stability
Structural Stability Project This office building required foundation improvements but had to stay open while the work was done. Requirement To ensure the safety of people inside and to comply with building codes, the structure had to be monitored for settlement and deformation. Solution GEO installed an AMTS on a foot bridge. It monitored prisms…
Read More3D Consolidation Mapping
Mapping Ground ImprovementGEO used a helicopter and a GPS enabled camera to gather point cloud data for 3D monitoring of ground improvement work. The mapping successfully captured surface settlements induced by deep dynamic compaction and surcharging. More recently, the mapping process is performed more efficiently by drones.
Read MoreMetro Tunnel
DC Metro Tunnel GEO’s deployed an automated monitoring system in a WMATA tunnel. The system included strain gages, convergence gauges, tiltmeters, vibration monitors, and AMTS. The AMTS and prisms are clearly visible in the photo on the right. Also visible is one of the eight vibration monitors and wall-mounted geophones.
Read MoreTunnel & Piezometers
Piezometers along Tunnel Alignment Piezometers were installed in the roadway above the Bellevue tunnel alignment. The instruments were collocated with observation wells and inclinometers at 10 locations. All were automated with wireless dataloggers that were capable of transmitting data through the inspection plates. Piezometer readings were transmitted hourly and displayed on a dedicated project website.…
Read MoreM-Street Excavation
M-Street Excavation & Tunnel GEO monitored a 32-foot deep excavation and a WMATA metro tunnel adjacent to the excavation in Washington DC. The SOE consisted of drilled soldier piles braced with whalers and rakers. GEO’s technician can be seen on the wall. Monitoring prisms, a few visible in this photo, were mounted at the top…
Read MoreBellevue Tunnel Portal
Bellevue Tunnel Portal The East Link extension adds 14 miles and 10 stations to Sound Transit’s light rail system, carrying commuters between Bellevue and Seattle. This is a conceptual drawing of the south portal site, where the light rail enters the Bellevue Downtown Tunnel. This was the actual south portal site, cleared, graded, and ready…
Read MoreMerrimack Bridge
Merrimack Bridge MassDOT rehabilitated the Merrimack River Bridge, strengthening the superstructure and mitigating scour around the bridge piers. GEO placed an automated total station (AMTS) on the nearby Comeau bridge to monitor the stability of the piers of the Merrimack bridge. The AMTS measures angles and distances to prisms installed on the piers and transmitted…
Read MoreKennedy Center
Kennedy Center Expansion The John F. Kennedy Center for the Performing Arts undertook an expansion project at its south end, adding three pavilions and a pedestrian bridge. The work involved demolition, excavation, and other construction activities that could affect the Kennedy Center, the Roosevelt Bridge ramp, and the underground DC water utilities. Early on in…
Read MoreSimpson Querrey Center
Simpson Querrey Center This satellite view showed the construction site for the Simpson Querrey Biomedical Research Center on Northwestern University’s Chicago Campus. The small blue dots were the locations of the AMTS systems used on the project. GEO supplied and configured the AMTS for Getec UK (now GEO-Instruments UK). The Google Street View rover captured…
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