Rock Polyaxial Fixture
GCTS offers specialized fixtures designed to perform true triaxial (polyaxial) tests within standard GCTS rock triaxial cells, enabling the study of the intermediate principal stress effect on rock engineering behavior. These fixtures allow accurate characterization of rock strength under a general system of polyaxial compressive stresses.
The RPX-150 and RPX-300 True Triaxial Fixtures are engineered for smaller-sized specimens and integrate seamlessly with existing GCTS triaxial systems. They function similarly to the RPS True Triaxial Testing Systems, utilizing controlled loading platens in direct contact with the specimen. Both fixtures support high-temperature environments and can be upgraded with hydraulic fracturing platens for wellbore stability simulations as well as ultrasonic velocity sensors for P- and S-wave measurements under varying stress states.
RPX-150
FIXTURE HIGHLIGHTS
- Stainless steel construction
- Perform poly-axial (true triaxial) tests within a GCTS rock triaxial cell
- Accommodates cubical or cylindrical rock specimens with maximum dimensions of 38 mm by 38 mm by 76 mm or 38 mm diameter by 76 mm height
- Independent control of σ₁, σ₂, σ₃ (where σ₁≠σ₂≠σ₃) or ε₁, ε₂, ε₃ or a combination of stress or strain control for each axis
- Measures strains in all three orthogonal directions
- Stress control up to 70 MPa
- Available ultrasonic sensors to measure P and S wave velocities under different stress states
- Optional hydraulic fracturing platens available to perform wellbore stability tests
- Customized fixtures available to fit existing triaxial cells
RPX-300
FIXTURE HIGHLIGHTS
- Stainless steel construction
- Perform poly-axial (true triaxial) tests within a GCTS rock triaxial cell
- Accommodates cubical samples with maximum dimensions of 50.8 mm x 50.8 mm x 101.6 mm
- Independent control of σ₁, σ₂, σ₃ (where σ₁≠σ₂≠σ₃) or ε₁, ε₂, ε₃ or a combination of stress or strain control for each axis.
- Measures strains in all three orthogonal directions
- Stress control up to 70 MPa
- Available ultrasonic sensors to measure P and S wave velocities under different stress states
- Available ultrasonic sensors to measure P and S wave velocities under different stress states
- Optional hydraulic fracturing platens available to perform wellbore stability tests
- Customized fixtures available to fit existing triaxial cells
