Keller was called in to stabilize and repair a failed MSE wall. The wall supported a highway overpass.
GEO-Instruments was contracted to monitor the wall during the repair work.
Gravity Base Towers
Keller fabricated gravity base towers for the two AMTS systems deployed at the project.
The towers provide a stable, elevated platform for the AMTS. Gravity base towers can be deployed almost anywhere, relocated as necessary, and later removed when the project is complete.
The first AMTS was operational within a week after the request. It monitored 20 prisms and 400 feet of wall.
The second AMTS was operational a few weeks later. It monitored 40 prisms installed on 900 feet of wall.
GeoCloud web servers continuously received and processed measurements from the site, presenting the data on a project website.
Data and trend plots always showed current data and could be viewed with desktop and smartphone browsers.
Alerts were sent by email and SMS if alarm thresholds were exceeded.
Co-locating instruments can provide confidence that measurements are correct.
Measurements from co-located prisms and tiltmeters track each other closely, showing nearly the same displacements over a 3 month period. Limit lines for the two plots at top are set at ± 0.5 inches. The bottom right plot shows a 24 hour period.