Characteristics of in-situ dynamic stresses of pavement subgrade under portable falling weight deflectometer test

G. L M Leung, Yuhong Wang, A. W G Wong

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)


This paper has summarised and enhanced the understanding on the dynamic stress characteristics within soil subgrade material under PFWD tests, by in-situ measurement of vertical and confining stresses. Besides, several crucial findings were yielded, (1) The different natures of the PFWD applied stress and soil stress indicate the variations of vertical stresses within the soil mass are influenced by other factors apart from the applied stress alone; (2) Beyond the distance of one times the PFWD plate diameter from the source of load, the E(PFWD) stays fairly constant, this corresponds to a vertical stress ratio (stress measured/stress applied by PFWD) of about 0.2; (3) The horizontal confining stresses are highest at the location of the source of load and reduce dramatically away from the source; (4) The drop height of mass was found to impose a moderate influence on the EPFWD, which is different from the findings provided by some of the previous researchers and (5) The confining stress has the strongest correlation with E(PFWD), being followed by vertical stress and deviator stress.
Original languageEnglish
Title of host publicationAdvances in Transportation Geotechnics II - Proceedings of the 2nd International Conference on Transportation Geotechnics, ICTG 2012
Number of pages5
Publication statusPublished - 19 Oct 2012
Event2nd International Conference on Transportation Geotechnics, ICTG 2012 - Hokkaido, Japan
Duration: 10 Sep 201212 Sep 2012


Conference2nd International Conference on Transportation Geotechnics, ICTG 2012

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Transportation

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