Using Soil Stress State Transducers in Freezing Ground

Three instrumented test sections of sand, silt and clay, were constructed to monitor the impact of frost layers on vehicle induced stresses and to assess the performance of the sensors used to measure such stresses. One of the instruments used to measure in-situ stress is the soil Stress State Transducer (SST), which was installed at 12.7cm depth within each of the test soils. The SST was designed by the USDA Agricultural Research Service, National Soil Dynamics Laboratory and the Auburn University Department of Agricultural Engineering, and has been used in many studies on vehicle induced stresses in agricultural soils, but not previously in freezing soil. Each SST consists of six semiconductor pressure transducers installed in a small sphere. Soil displacements, temperature and moisture and strength profiles were also monitored. Trafficking of the test sections was performed at frost depths ranging from zero to over 50 cm. The SSTs functioned very well in frozen ground. The signals clearly showed the passage and sometimes the bow wave in front of each tire, and then the large vertical pressure spike as each tire passes over the sensor. The stress magnitudes diminish as the ground freezes above the sensors and then decrease further as the frost envelops the entire sensor.

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 565-571
  • Monograph Title: Cold Regions Engineering 2009. Cold Regions Impact on Research, Design and Construction

Subject/Index Terms

Filing Info

  • Accession Number: 01144382
  • Record Type: Publication
  • ISBN: 9780784410721
  • Files: TRIS
  • Created Date: Nov 17 2009 12:28PM