- Author
-
Yokel, F. Y.
|
Chung, K. Y.
- Title
- Study of Reverse Torque Ratio in the Helical Probe Test.
- Coporate
- National Bureau of Standards, Gaithersburg, MD
Korea Institute of Science and Technology, Republic of Korea
- Report
-
NBSIR 86-3423
September 1986
27 p.
- Distribution
- Available from National Technical Information Service
- Keywords
-
soil properties; augers; grain size; helical gears; torque; field tests; data; soil tests
- Abstract
- The report covers a study to determine whether the ratio of the torque required to extract the Helical Test Probe to the torque required to advance the probe (the reverse torque ratio) can be used to determine the average grain size of the soil. On the basis of 274 test points in sandy, silty, and clayey soils, it was concluded that the reverse torque ratio decreases with increasing average grain size. The relation between grain size and reverse torque ratio is apparently not sensitive to the magnitude of the torque required to advance the probe.