11 th Annual Technical Forum GEOHAZARDS IMPACTING TRANSPORTATION IN - - PowerPoint PPT Presentation
Filename and location 11 th Annual Technical Forum GEOHAZARDS IMPACTING TRANSPORTATION IN THE APPALACHIAN REGION GEO-DESIGN APPLICATIONS IN KARST ENVIRONMENTS William D. Spencer, P.G., Jaye Richardson, and Chris Ramsey, P.E. AMEC, Nashville
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William D. Spencer, P.G., Jaye Richardson, and Chris Ramsey, P.E. AMEC, Nashville TN August 3, 2011
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SUMMARY OF DEEP FOUNDATION OPTIONS
(H-Piles)
OPTIONS PERCEIVED ADVANTAGES Low cost PERCEIVED DISADVANTAGES Impossible to assess bearing strata
(Caissons)
High load capacity; low long term risk High cost; potentially large voids in bedrock might take large quantities of concrete to fill.
Drilled Pipe Piles (Micro Piles) Low long-term risk; easy to make adjustments Moderate to high cost; smaller than “normal” pile size for bridge bents; requires real-time field engineering during construction to adjust.
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BEFORE Karst engulfing the soil and ballast AFTER Micro pile and structural land bridge REMOVES the karst from play and provides for surface drainage under the track.
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