GCTS offers a variety of equipment to perform true triaxial (polyaxial) tests on prismatic specimens.
The RPS-100 and RPS-600 True Triaxial Testing Systems provide complete solutions for true triaxial testing. These systems can be used to study the intermediate principal stress effect on rock engineering behavior and adequately describe the strength of a rock under a general system of polyaxial compressive stresses. They are designed to apply three independent stresses (σ1, σ2 and σ3) onto a cubical test specimen by utilizing hydraulic intensifiers to apply pressure to solid platens that are in direct contact with the specimen. Both systems can be upgraded with pore pressure control, temperature control, and ultrasonic velocity sensors for P and S wave measurements. In addition, both systems can be upgraded with hydraulic fracturing platens to approximate the effects of anisotropic stress state on borehole stability. The RPS-100 is designed for cubical specimens with sides up to 100 mm and the RPS-600 is designed for cubical specimens with sides up to 300 mm (with an upgrade available for specimens up to 600 mm tall).
The RPX-150 and RPX-300 True Triaxial Fixtures are designed to be used within standard GCTS triaxial cells to perform true triaxial tests on smaller-sized specimens. These fixtures function similar to the RPS Systems, with hydraulic intensifiers controlling the loading platens that are directly in contact with the specimens. Both fixtures can be used in high-temperature environments and can be upgraded with hydraulic fracturing platens and ultrasonic velocity sensors. The RPX-150 is designed for 38 mm by 38 mm by 76 mm tall specimens and utilizes the confining pressure to apply σ3 (with the loading jacks applying σ2). The RPX-300 is designed for 50 mm by 50 mm by 100 mm tall specimens and utilizes loading jacks to apply σ2 and σ3 to the specimen. Both systems utilize a load frame’s axial actuator to apply σ1.
Download the RPS-600 PDF Brochure
Download the RPS-100 PDF Brochure
Download the RPX-150 PDF Brochure
Download the RPX-300 PDF Brochure