Selected Case Histories of the Use of Resistivity and Seismic Refraction in Subsurface Investigations for New Hampshire Department of Transportation

This research report was funded through New Hampshire?s State Planning and Research (SP&R) funds and it summarizes the New Hampshire Department of Transportation?s attempt to supplement conventional test borings and exploration techniques through the use of geophysics on several geotechnical projects. In many of our geotechnical investigations the depth to bedrock or unstable soils is quite variable over short lateral distances. Conventional explorations are point specific and are capable of missing sudden depth changes and variations in the soil and rock properties. Additional explorations can quickly exhaust available time and money and can sometimes lead to a more puzzling, instead of less confusing, subsurface interpretation. A project?s site conditions or highly conductive soil properties can limit the use of specific geophysical techniques, but through the implementation of additional geophysical equipment the Department has enhanced their capabilities. These new capabilities have helped to alleviate some of the uncertainties when making subsurface interpretations solely through conventional exploration activities. This paper presents case histories on resistivity imaging and seismic refraction used in conjunction with conventional explorations on geotechnical projects to characterize a project?s subsurface conditions. Included are the methods employed for using these geophysical techniques, the geophysical results and how these results were calibrated and verified.

Language

  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; Photos; References; Tables;
  • Pagination: 13p
  • Monograph Title: TRB 86th Annual Meeting Compendium of Papers CD-ROM

Subject/Index Terms

Filing Info

  • Accession Number: 01046324
  • Record Type: Publication
  • Report/Paper Numbers: 07-1551
  • Files: TRIS, TRB
  • Created Date: Feb 8 2007 6:11PM