Soil Investigation by Helical Probe Test

나선심사시험에 의한 지반조사기법

  • ;
  • Yokel, Felix Y. (Senior Researcher, U.S. Department of Commerce, National Bureau of Standards, Center for Building Technology)
  • 정구영 (정회원, 한국건설기술연구원) ;
  • Published : 1987.12.01


A helical probe test (HPT) suitable for in.situ soil exploration to a shallow depth and compaction control were developed and tested in different soils alongside traditional in-situ tests, including Standard Penetration Test (SPT), Cone Penetration Test (CPT) and in-situ density test. The helical probe test 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; the HPT test correlates well with the CPT test, but the correlation is sensitive to the soil type; the HPT torque provides a sensitive measure of relative compaction rind in-situ dry density of compacted soils; the reverse torque ratio decreases with increasing average grain sloe.