Direct Shear Test for Coarse Granular Soil

Katarzyna Dołżyk-Szypcio


A large direct shear apparatus was used to test coarse granular soil. In shear tests with a small shear box, deformation in shear band is homogeneous and stress–dilatancy relationships at pre-peak and post-peak phases of shearing are similar. However, in tests with a large shear box, the pre-peak and post-peak stress–dilatancy relationships are different. Using frictional state theory, it has been shown that the stress–dilatancy relationship for the large shear box is different from that for the small one conventionally used in direct shear tests, which suggests higher non-homogeneity deformation in the shear band in a large shear box in comparison to that in a small one. Parameter α of frictional state theory equals zero for the small and large shear boxes at failure. Parameter β = 1.4 for the small shear box and is a function of initial moisture and compaction for the large shear box. Average values of β range between 2.27 and 2.52 for dry coarse granular soil and between 2.17 and 2.30 for wet one. The value of critical frictional state angle Φ°= 41.2° of tested coarse granular soil is independent of soil moisture and compaction. The influence of the box’s size on stress–dilatancy relationship has also been observed in the previous studies.
Author Katarzyna Dołżyk-Szypcio (FCEE / DGSM)
Katarzyna Dołżyk-Szypcio,,
- Department of Geotechnics and Structural Mechanics
Journal seriesInternational Journal of Civil Engineering, ISSN 1735-0522, e-ISSN 2383-3874, (N/A 100 pkt)
Issue year2019
Publication size in sheets0.5
Keywords in EnglishLarge direct shear Dilatancy Frictional state Coarse granular soil Stress–dilatancy
ASJC Classification2205 Civil and Structural Engineering
Internal identifierROC 19-20
Languageen angielski
LicenseJournal (articles only); published final; Uznanie Autorstwa (CC-BY); with publication
Score (nominal)100
Score sourcejournalList
ScoreBUT score = 18.0, 31-05-2019, manual
Ministerial score = 100.0, 14-02-2020, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.434; WoS Impact Factor: 2016 = 0.624 (2) - 2016=0.718 (5)
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