The GDS Combined Advanced Dynamic Cyclic Simple
Shear (ADVDCSS) testing system is a new innovation by GDS in
that it combines Simple shear and Triaxial testing without the use
of a separate loadframe.
A cylindrical soil specimen is laterally confined
by Teflon coated low friction retaining rings, ensuring a
constant cross sectional area. A shear force loading is then applied. Vertical displacement may be prevented, therefore
constant volume conditions are enforced (i.e Simple Shear). The GDS
Combined Dynamic Cyclic Simple Shear (DCSS) apparatus is a preferred
device for research into dynamic soil behaviour because of its
simplicity and its ability to model many types of field loading
conditions that are difficult to achieve with other laboratory
equipment.
Download full
specification datasheet as
pdf
[174kb]
What are its
uses
The ADVDCSS apparatus allows for a smooth and continuous rotation
through 90 degrees of the principal stress directions. The ability
to simulate principle stress rotation is common to many geotechnical
problems, including earthquake loading. The simple shear device
allows direct investigation of the shear stress v. shear strain in
drained and undrained situations. In addition, the dynamic cyclic
capability allows investigation of damping ratio and liquefaction.
