Railroad Embankment Slope Stabilization with Tiebacks and Micropiles-Video

Video Transcription

Video Summary

The presentation described stabilization of a 120-year-old Norfolk Southern embankment in southwest Virginia, where decades of creeping movement threatened a busy rail line. A creek had shifted toward the embankment toe, causing substantial erosion. Borings and slope inclinometers identified deep and shallow slide planes; despite the instruments shearing off soon after installation, their readings clarified the failure mechanism. Back-analysis indicated a friction angle of about 18 degrees within the failure zones.<br /><br />The repair combined two systems: micropiles and tieback anchors at the toe, and a micropile-supported cap beam near track level. Limited access, steep terrain, timber piles, and ongoing train operations complicated design and construction. Instrumented load testing informed the installation approach, and production pile tests ultimately passed. The system was completed in June 2022, with no reported movement or track issues since.

Keywords

Norfolk Southern embankment

slope stabilization

micropiles

tieback anchors

rail line erosion

embankment repair