A laboratory investigation for assessment of rod friction in dynamic probing

Unal G., Kayalar A.

15th International Conference on Soil Mechanics and Geotechnical Engineering, İstanbul, Turkey, 27 - 31 August 2001, pp.299-302 identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.299-302
  • Dokuz Eylül University Affiliated: No


A laboratory test model has been prepared for determining skin frictions of a rod in driving and rotation. It is composed of a mold, a probing rod, a surcharge kit, a driving kit and a rotation kit. This equipment simulates the performance of dynamic probing test without tip resistance. Unit skin frictions developed during driving and rotation can also be determined with this equipment. Probing tests without tip resistance have been performed on several cohesionless and cohesive soil samples. During the performance of the laboratory tests; void ratio for cohesionless samples, liquidity index for cohesive samples and surcharge for both have been varied. Equipment used, method of testing, characteristics of the soil samples, test results and their evaluation have been presented. Driving and rotational unit skin friction values for all sample groups tested have been found to be linearly dependent.