The TruePath Automated Stress Path System is GEOTAC’s most advanced system incorporating state of the art in data acquisition and feedback control. A TruePath system consists of a Sigma-1 load frame, two DigiFlow pressure volume actuators (flow pumps), and a high-resolution analog data acquisition system all connected to a computer through TestNet.
TruePath Software guides the operator through the following test stages:
- SEATING – automatically adjusts cell pressure and/or vertical load to maintain specimen volume or vertical load.
- BACK PRESSURE – options for ramp, step or a gradual increase in back pressure based on pore stiffness (dP/dV) and automated measurement of B coefficient.
- CONSOLIDATION – options for isotropic, anisotropic, Ko, and creep consolidation including unload-reload cycles to obtain specimens with OCR > 1 for SHANSEP testing.
- SHEAR – options for specimen shearing include constant rate of deformation, shear along a prescribed stress path or a series of step loads.