Electrical Resistivity in the Kansas Ozarks: US 166 Bridges in Cherokee County

In the fall of 2015, the Geology Section of the Kansas DOT used electrical resistivity surveys to supplement bridge foundation investigations at a project near Baxter Springs. The realignment and widening of US 166 in the far southeast corner of the state will require new bridges at 6 locations. The geology of the area is karstic, part of the Springfield Plateau of the Ozark Mountains, characterized by thick sequences of cherty limestone and dolomite. The presence of large pieces of chert, both within the rock and as gravel layers in the overburden, damages drill bits and often limits attainable borehole depths. Karst features such as pinnacles and cavities can be kept hidden by unlucky placement of borings. In addition, steep, wooded terrain prevents easy access by drill rigs at some locations. If earth resistivity were able to help profile the geology at these bridge locations, drilling could be scaled back. The primary field challenge of these resistivity surveys was dry surface soils, that compromised contact resistance and wearied the workers who placed electrodes. Very shallow bedrock also complicated data collection at some locations. Overall data quality was good; the usefulness of the inversion profiles was mixed. Groundwater near the bedrock contact interfered with the interpretation of geology at several places.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures;
  • Pagination: pp 34-41
  • Monograph Title: Proceedings of the 67th Highway Geology Symposium (HGS 2016)

Subject/Index Terms

Filing Info

  • Accession Number: 01627833
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 28 2017 9:04AM