Extra Large Cyclic Triaxial System for Soils
STX-2000 Cyclic Triaxial System XL

The GCTS STX-2000 Cyclic Triaxial System XL is engineered for performing tests on soils with large particle sizes such as rock backfills and gravely soils. With versatility in mind, it is also capable of performing other tests.


  • Electro-Hydraulic digital servo control.
  • 1,000 mm Specimen Diameter.
  • Axial loads up to 3,000 kN.
  • Cell Pressures up to 3,000 kPa.
  • Direct servo control of stress, strain (axial, radial, volumetric, etc. ) or any other calculated variable.
  • Dynamic compaction frame with 200 kN load capacity and frequencies from 0 to 100 Hz.

The GCTS Extra Large-Scale Soil Triaxial System (STX-2000) is intended for performing tests on soils with large particle sizes, such as rock backfills and gravely soils. The triaxial cell accepts 1,000 mm diameter samples with heights up to 2,000 mm. This system also provides the necessary versatility to automatically perform conventional triaxial tests as well as more advanced procedures, such as stress or strain path. In addition, the STX-2000 has the capability of performing dynamic triaxial tests.


The STX-2000 includes all hardware needed to create and load a large specimen into the testing chamber without need of a forklift. It also includes a dynamic compaction frame, which can create the specimen using a 200 kN axial load and at frequencies of up to 100 Hz.


This system uses an innovative cost-saving and space-saving design with many automation features. This includes an automatic triaxial cell assembly that hydraulically locks the triaxial cell without requiring any tightening of nuts or bolts.


The standard STX-2000 system includes all the necessary hardware and software to automatically perform all triaxial stages, including saturation and consolidation. Custom testing procedures can be easily programmed by the user, and an unlimited variety of waveforms can be executed by the system as defined by the user. The program alerts the user to important testing steps that must be performed, minimizing training time while increasing productivity.


The triaxial cell included with the STX-2000 system is constructed of stainless steel. The standard unit features a composite, see-through Plexiglas cell wall reinforced with anodized aluminum rings. All the standard GCTS triaxial cells can accommodate smaller diameter specimens using the optional platens and provides the necessary information required to automatically execute the desired test.


  • 3000 kN axial load capacity
  • 10 Hz maximum testing frequency
  • 3000 kPa confining pressure capacity
  • 200 kN compaction axial load capacity
  • 100 Hz maximum compaction frequency


Please contact GCTS for full specifications.