GDS True Triaxial Apparatus (GDSTTA)

The True Triaxial Apparatus (TTA) has the defining characteristic that, unlike conventional triaxial apparatus, all three principal stresses can be controlled independently, rather than just 2 in a conventional triaxial system.

This allows a wider range of complex stress paths to be performed. This dynamic cyclic system is powered by electro-mechanical* actuators and is an extremely sophisticated research tool.

To read a white paper about how the GDSTTA was built click on the link, True Triaxial.

Download full specification datasheet (PDF) Enquire NOW



  • Stress or strain is applied to a 75mm x 75mm x 150mm shape sample independently in its 3 axes.  
  • 2 pairs of matched 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. 
  • Each actuator pair can be controlled in “static-mode” with either constant, ramp or slow cyclic targets in terms of load, stress or displacement.  
  • Full sample preparation equipment for cohesive and non-cohesive samples is provided with the system including a specially designed soil lathe for producing cuboidal samples.
*Hydraulic actuators are available upon request.

Data Aquisition16 Bit
Load Range (kN)5kN/10kN/15kN Electro-mechanical or 28kN Hydraulic.
Pressure Range (Mpa)2

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