- Author
- Yokel, F. Y. | Mayne, P. W.
- Title
- Helical Probe Tests for Shallow Soil Exploration.
- Coporate
- National Bureau of Standards, Washington, DC
- Report
- NBSIR 86-3351, January 1986, 60 p.
- Distribution
- Available from National Technical Information Service
- Keywords
- construction supervision | field test equipment | helical augers | in situ measurements | penetration tests | residual soils | soil investigation | soil mechanics | test procedures
- Abstract
- Helical test probes of different sizes, suitable for in situ soil exploration to a shallow (1.8m) depth and compaction control were developed and tested in different soils alongside traditional in situ tests, including standard penetration tests (SPT), cone penetration tests (CPT), dilatometer tests (DMT), and in situ density tests. The helical probe test (HPT) is economical and can be performed by a single person. The torque necessary to insert the probe is used as a measure of soil characteristics. It was found that: the HPT test correlates well with the SPT test and the correlation is not sensitive to the soil type (particle size): the HPT test correlates well with the CPT test, but the correlatin is sensitive to the soil type; the PHT/SPT and HPT/CPT correlations are consistent with existing data on SPT/CPT correlations; The HPT torque provides a sensitive measure measure of relative compaction and in situ dry density of compacted soils.