True Triaxial Rock Testing System and Trainers

The True Triaxial Rock Testing System and Trainers system is specifically designed for the mechanical characterization of large cubic rock specimens under fully independent stress control along the three orthogonal principal axes (σx, σy, σz). It enables rigorous reproduction of complex anisotropic in-situ stress conditions and precise simulation of true triaxial loading paths. The system allows high-resolution determination of principal stresses, directional strain responses, and failure criteria under true triaxial loading. The specimen is confined between six servo-controlled hydraulic actuators, configured in opposing pairs along each axis. Each actuator pair applies axial loading to the specimen, ensuring uniform stress distribution across the specimen faces. Actuation is driven by three independent high-pressure syringe pumps, providing closed-loop pressure regulation and fine stress-path control. Axial deformations are continuously monitored using six high-precision LVDT displacement transducers, with two sensors per axis to ensure redundancy and measurement accuracy. Optional thermal control enables subsurface temperature simulation. Ultrasonic monitoring of P- and S-waves allows real-time assessment of elastic evolution and damage. The system also supports true triaxial hydraulic fracturing and wellbore stability evaluation, with real-time acoustic emission monitoring of fracture initiation and propagation.

Specimen dimensions :

Type 1 :

• 100 × 100 × 100 mm

Type 2 :

• 200 × 200 × 200 mm

Type 3 :

• 300 × 300 × 300 mm

Maximum X-stress :

• 100 MPa

Maximum Y-stress :

• 100 MPa

Maximum Z-stress :

• 100 MPa

Temperature range :

• Ambient to 150°C (optional)

Wetted part material :

• Stainless steel

Power supply :

• 220 VAC, 2 phase, 50/60 Hz

• Realistic simulation of in-situ anisotropic stress conditions
• Independent control of three principal stresses (X, Y, Z)
• Thermo-mechanical testing up to 150°C : Simulates realistic reservoir temperature conditions
• Advanced monitoring capabilities (strain, ultrasonic waves, acoustic emission)