Presentation on theme: "Roadbed Instability Problems Chapter 19. Roadbeds built years ago Crude Methods Seasoned Time and Loading Problems Sinks Soft Spots Water Pockets."— Presentation transcript:
Stabilization Solutions Improve Drainage Diversion ditches—Intercept Conveyance ditches—lateral and longitudinal French drains Deep ditching—lower water table
Soil Additives Blend in during new line construction Pressure inject in existing lines Advanages Increase strength—cementing Lower plasticity—base exchange Reduce affinity for water—lower PI
Geotextiles (Filter Blankets) Variable Success Must have drainage outlet Must protect GeoWeb is more effective
Separation mat or layer Asphalt successfully utilized Separate ballast from subgrade Confine ballast Waterproof subballast/subgrade Distribute reduced pressures Provide Consistent Support
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