Development of a geotechnical GIS for subsurface characterization with three dimensional modeling capabilities.
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Development of a geotechnical GIS for subsurface characterization with three dimensional modeling capabilities.

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      Final report.
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    • Abstract:
      The New Hampshire Department of Transportation initiated this research to develop a geographical information system (GIS) that

      visualizes subsurface conditions three dimensionally by pulling together geotechnical data containing spatial references. It incorporates

      several geotechnical projects ranging in size from a fairly small roadway project to a much larger roadway by-pass project. The research

      procedure encompassed taking subsurface data housed on one of the Department’s computer servers and exporting the data as text

      delimited files into a GIS running a 3D modeling extension. A statewide GIS layer was created to access all the available subsurface data

      so existing data in close proximity to new projects could easily be recognized. The GIS utilizes the data to observe the existing

      subsurface conditions three dimensionally. By observing where the least confident data was located, the 3D modeling extension helped to

      determine where and how many additional explorations were needed to adequately map the subsurface conditions to a defined level of

      confidence. For each project, soil and bedrock surfaces were identified and the bedrock surface was exported into a CAD system where

      project cross sections were drawn depicting the bedrock depths along the new roadway centerline. The results of the research indicated

      that a GIS containing existing subsurface data running a 3D modeling extension could adequately map bedrock surface elevations with a

      minimal amount of additional subsurface explorations. It also demonstrates how new and existing soil density and bedrock surface

      elevation data can easily be observed three dimensionally on a computer screen.

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