What Is a Geosynthetic Reinforced Soil (GRS) Wall?
GRS walls (the integrated bridge system — the closely spaced geotextile reinforcement with the granular fill and the flexible facing) build the bridge abutments and the retaining walls as the composite reinforced-soil mass. The FHWA's GRS-IBS: the reinforcement every 8-12 inches (the close spacing — the composite action), the facing (the split-face block — the flexible), and the integrated (the bridge bearing directly on the GRS — the jointless). The economical short-span bridge's foundation.
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How GRS works
The close reinforcement (the 8-12 inch — the soil and the geotextile straining together; the composite — the internal stability), the fill (the granular — the open-graded; the compaction — the lifts), and the facing (the modular block — the frictional connection; the flexible — the settlement accommodating).
The GRS-IBS bridges
The integrated (the bridge's superstructure bearing on the GRS abutment — the jointless; the thermal — the flexible accommodating), the spans (the 20-100 foot — the short-span; the rapid — the weeks' construction), and the economy (the deep foundations avoided — the cost halved; the county bridges' — the standard).
Design and construction
The FHWA guidance (the GRS-IBS manual — the design; the reinforcement strength — the creep-reduced), the QC (the compaction — the density; the reinforcement — the placement), and the limits (the scour — the water; the tall walls — the MSE's domain). The GRS wall is the simple retaining — the close reinforcement making the soil stand.
The bottom line
GRS walls (geotextile every 8-12 in with granular fill per FHWA GRS-IBS) create composite abutments bearing bridges directly — economical, rapid short-span construction.
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