387
Views
4
CrossRef citations to date
0
Altmetric
Original Articles

Comparative study of shear strength characteristics of dry cohesionless sands from triaxial, plane-strain and direct shear tests

&
Pages 150-162 | Received 16 Jan 2019, Accepted 22 Jul 2019, Published online: 12 Aug 2019
 

ABSTRACT

Knowledge of strength properties and deformational behaviour of soils under different loading conditions is necessary in the analysis of most of the geotechnical engineering problems. This paper presents a comparative study of shear strength characteristics of sands as obtained from triaxial, plane-strain and direct shear test results. The experimental results on shear strength characteristics of dry sands obtained from triaxial, plane-strain and direct shear tests, were analyzed in order to investigate the effect of soil relative density or soil porosity on the angle of shearing resistance, dilatancy factor, particles interlocking, and volumetric strain and axial strain at failure. Furthermore, the results were used to develop correlations connecting between the angle of shearing resistance of triaxial condition test and the direct shear test, and between the angle of shearing resistance of plane-strain and triaxial compression conditions. The correlations developed take into account the interaction between soil relative density, dilatancy factor and particles interlocking. Good agreement has been obtained between the predicted results values using the proposed methods and the results of the present experimental investigation and those available in the literature

NOTATION

Ai,Bi, Ci and Di are coefficients, which depend mainly on D and OCR

D:=

the dilatancy factor

Dx:=

the diameter of the sand particles for which (X)% of particles are finer

1:=

plastic component of the axial strain

dv:=

plastic component of the volumetric strain

Gs:=
K:=

the material parameter;

ko:=

coefficient of earth pressure at rest

OCR:=

overconsolidated ratio

e:=

the initial void ratio of the sand.

emax.:=

maximum void ratio of sand

emin.:=

minimum void ratio of the sand

R:=

the principal stress ratio

Rd:=

the relative porosity of the sand

Rps:=

plane-strain principal stress ratio

RT:=

triaxial principal stress ratio

Si:=

sand ‘i’

β:=

the angle of dilatancy

Δy:=

Change of thickness at failure

φcv:=

the angle of shear resistance at constant volume

φps:=

angle of shearing resistance of plane-strain test,

φT:=

angle of shearing resistance of triaxial test,

σ1:=

major principal stress,

σ3:=

minor principal stress

σ:=

Normal stress applied on the plane of failure

τ:=

shear stress on the plane of failure

Acknowledgments

The financial support from the Natural Science and Engineering Research Council of Canada (NSERC) and Concordia University are acknowledged.

Disclosure statement

No potential conflict of interest was reported by the authors.

Reprints and Corporate Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

To request a reprint or corporate permissions for this article, please click on the relevant link below:

Academic Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

Obtain permissions instantly via Rightslink by clicking on the button below:

If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. For more information, please visit our Permissions help page.