Plate Piles Stabilize Deteriorating Interchange Ramp Slopes Williams, California

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call 800-371-7470 or visit geopier.com
SRT™
Description: For the Caltrans Route 20/Highway 5
Separation Project, the fill for the overpass ramp
embankments consists of clayey, highly expansive
soils obtained from nearby sources. After about ten
years, the stability of the embankment slopes began
to deteriorate as evidenced by slope creep and shallow
slides. The slope movement deteriorated the
pavement causing numerous cracks parallel to the
pavement edge combined with lateral spreading.
Additionally, guard rail posts were undermined by
shallow slides.
Geopier Solution: Caltrans considered several
methods for stabilizing the slopes: lime treatment of
the slope, slope inclination reduction using imported
fill, non-expansive fill slope overlay, and Geopier SRT™
stabilization. The final project design included a
combination of slope reduction, imported fill, and
Geopier SRT stabilization. Plate Piles™ were selected
to stabilize about 1.5 miles of ramp slopes as a cost
saving measure, with minimal earthwork operations
and shorter construction time.
The General Contractor scheduled 100 working days to
complete the installation of the approximately 8,800
Plate Piles. Installation was completed in
approximately 70 days at an average rate of 125 Plate
Piles per day. Approximately 2,700 six-foot-long Plate
Piles, and 6,100 ten-foot-long Plate Piles were
installed using both hydraulic hammers and vibrator
plates adapted for installation. The Geopier SRT
system for the 20/Highway 5 Separation Project
saved Caltrans over $3 million dollars and months of
additional construction time. Caltrans has been
monitoring the stabilized slopes for three years. After
two years, the slopes and new pavement have
performed well with no slope failures or signs of creep.
Plate Piles™ Stabilize Deteriorating Interchange Ramp Slopes
Williams, California
Project:
Caltrans Route 20/Highway 5
System:
Geopier SRT
Installation:
8,800 Plate Piles
PROJECT highlights
PROJECT SUMMARY | S04
Slope Reinforcement Technology
GEOPIER_PS_S04