Effect of opening on the shear behavior of granular materials in direct shear test

Byeong Su Kim, Satoru Shibuya, Seong Wan Park, Shoji Kato

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


This paper examines the effect of the opening between the shear boxes on the shear behavior in the direct shear box test (H=20 mm×D=60 mm) under a constant vertical stress using seven types of granular material. It is observed that the magnitude of shear strength and dilatancy decreases due to the outflow of sample with an increase in the opening. The two notions of the Threshold Point (TP) as the limit opening size and the Threshold Line (TL) offering the guideline of opening size is defined according to the mean particle size of soil samples. However, similar shear behaviors were observed regardless of the opening size because there was no outflow of sample through applying the Teflon sheet in the direct shear box tests for Toyoura sand. Finally, the shear mode on the circular specimen applying the Teflon sheet is also examined in comparison with the results from other tests.

Original languageEnglish
Pages (from-to)1132-1142
Number of pages11
JournalKSCE Journal of Civil Engineering
Issue number7
Publication statusPublished - Nov 2012
Externally publishedYes


  • Teflon sheet
  • direct shear box test
  • opening size
  • outflow of sample
  • shear mode

ASJC Scopus subject areas

  • Civil and Structural Engineering


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