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Optical analysis of stress and strain in shear zones H.G.B. Allersma

Summary: Optical analysis of stress and strain in shear zones
H.G.B. Allersma
Delft University of Technology, Delft, the Netherlands
ABSTRACT: A series of tests was carried out to visualize stresses and strains in a number of characteristic shear de-
vices. Since there is no unique relationship between stress and strain in granular material, information about stress-strain
behaviour can be obtained only by measuring stresses and strains independently in the interior of a sample. Currently,
only optical techniques, based on the photoelastic properties of transparent granular material, are available for acquiring
field information on stresses and strains. The optical technique is used to digitize the stress distribution and strains in
plane strain models with non-cohesive granular material, simulating simple shear, direct shear and continuous shear.
In the laboratory model tests are often used to examine
the behavior of real scale soil structures. Advanced tech-
niques are available, e.g. centrifuge modeling, to obtain a
better simulation of the field conditions concerning the
stress level. However, the information obtained from
laboratory tests is mainly concerned with deformations.
The stress measurements are in general restricted to some
point measurements of the normal and shear stress at the
boundary of the sample. Only in samples with a uniform
stress distribution with known principal stress directions


Source: Allersma, Henderikus G.B. - Geo-Engineering Section, Technische Universiteit Delft


Collections: Engineering