A GEOPHYSICAL SITE INVESTIGATION FOR A BRIDGE FOUNDATION IN A NARROW CANYON

The planned renovation of an existing bridge north of Boise, Idaho presented a number of difficulties to engineering geologists. Conventional investigation of the site by geotechnical boreholes was hindered by the limited space available in the narrow canyon. At issue was the soil profile under the bridge and the options for designing a suitable foundation (H-piles or spread footings). A geophysical refraction survey was conducted to provide soil profile information by combining a conventional refraction profile along the axis of the river with broadside acquisition under the bridge. The data were jointly inverted to produce a geologic cross section parallel to the bridge and roadway centre-line. Since conventional blow count data would not be acquired, the geophysics provided the primary soil profile information on which the costs of the foundation alternatives could be compared.

  • Availability:
  • Corporate Authors:

    Texas A&M University, College Station

    College Station, TX  United States  77840
  • Authors:
    • Michaels, P
  • Publication Date: 1995

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00722367
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Jun 28 1996 12:00AM