In-situ ground surveying by the NSWS testing machine

Shinya Inazumi, Kenji Kazarashi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


This paper outlines the development of the NSWS (Nippon Screw Weight System) testing machine. In compliance with the Swedish sounding (SWS) test that determines loading and rotational penetration resistance. The NSWS was developed as an in-situ ground surveying device to detect super soft zones in the ground, including hollows and loosening, in detail, by allowing operation in the 0 to 2500N load range, with very close measurements intervals and penetration speed control, the features of which cannot be achieved by the SWS testing machine. Additionally, findings from an in-situ surveying of in-ground hollows identified using the NSWS testing machine are reported in this paper. The machine achieved a conversion N-value measuring intervals of 2.5cm (or 3.8cm), determination of ranges of hollow and loosening zones through pre-setting of penetration speed, and detection of super soft zones of conversion N-values 1 and below with a load range of 0 to 1000N.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalInternational Journal of GEOMATE
Issue number1
Publication statusPublished - 2011 Oct
Externally publishedYes


  • Conversion N-values
  • In-ground hollow
  • In-ground loosening zone
  • NSWS testing machine

ASJC Scopus subject areas

  • Environmental Engineering
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology
  • Soil Science


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