Pile Stabilized Slope Design and Vibration Estimation and Monitoring-PPT Presentation

PPT Presentation

Pdf Summary

The presentation describes vibration monitoring for the West Fargo Main Avenue slide repair. Slope movement had been documented since 2008, with evidence dating to 2002. After evaluating stabilization options, the design team selected two staggered rows of 12-inch-diameter driven pipe piles, spaced 10 feet apart and installed to approximately 50 feet. Driven piles were considered the most cost-effective practical solution.<br /><br />Because nearby residents had previously felt vibrations during roadwork, the project team established vibration thresholds and estimated potential levels. They also calibrated expectations using measurements from pile driving on an I-94 project about 2.5 miles away.<br /><br />Seismographs monitored the site from 7 a.m. to 6 p.m., recording both histograms and full waveforms. If readings reached 80% of a threshold, the team would investigate the source; construction-related alerts would require the contractor to submit a vibration-reduction plan before resuming work. Property owners and businesses within 400 feet were offered pre- and post-construction condition surveys.<br /><br />Monitoring began April 8, 2024, but construction was delayed until June 26. As a result, background data collection lasted 28 to 79 days rather than the planned seven. Equipment required regular maintenance and was subject to damage, theft, and vandalism.<br /><br />No construction-related vibration alerts or homeowner complaints occurred during construction. The piles were successfully installed, and slide movement was stopped. The full vibration-monitoring effort, from planning through completion, lasted approximately 1.5 years.

Keywords

vibration monitoring

West Fargo

Main Avenue slide repair

driven pipe piles

slope stabilization

pile driving

seismographs

vibration thresholds

construction monitoring

slide movement