The latest addition to the GDS range
is the GDS True Triaxial Apparatus (GDSTTA).
The GDSTTA allows
independent control of stresses applied in three dimensions to a
cuboidal soil sample. The ability to independently control the
stresses applied in three dimensions allows the true
stress-strain-strength behaviour of soil to be studied.
Stress or strain is applied to a 75mm x 75mm x 150mm shape sample
independently in its 3 axes. 2 pairs of matched hydraulic rams for
axes 1 and 2, and a confining fluid provides pressure for the third
axis. Each ram has its own internal submersible load cell and
displacement transducer to ensure friction effects are minimised. As
well as static tests, the system is capable of driving the 2 pairs
of hydraulic rams at frequencies up to 5Hz.
