Purpose-built for investigating soil behavior under principal stress rotation with combined axial load, confining pressure, back pressure, torque, and controlled rotation. Ideal for liquefaction studies, anisotropy assessment, non-coaxiality, and strain-path controlled research.
Enables independent control of σ₁, σ₂, σ₃ directions and magnitudes through axial force, cell/back pressure, and torsional shear supporting both static and cyclic modes with precise path following.
Hollow specimen form reduces end restraint and facilitates uniform shear strain distribution, allowing small-strain characterization as well as large cyclic deformation programs.
Closed-loop control in torque, rotation, axial load, or axial strain, with configurable endpoints by cycle count, strain limit, pore-pressure ratio (ru), stress path limit, or stiffness degradation threshold.
High-rate acquisition with synchronized channels (axial load/displacement, torque/rotation, cell and pore pressures, volume change) for real-time plots (τ–γ, q–εa, Δu–N, stress path p′–q).
Flexible specimen tooling for saturated and unsaturated testing workflows, with saturation aids (CO₂/de-aired water), B-value checks, and optional local strain measurement.
