Measures drained residual shear strength and cyclic degradation behavior of soils using a continuous-rotation ring shear mechanism under controlled normal stress. Suitable for landslide studies, reactivated slip surfaces, clay gouge, and rock–soil interfaces.
Enables monotonic and cyclic shear programs with constant normal load (CNL) or optional constant normal stiffness (CNS), capturing large shear displacements without reversal limits (continuous rotation).
Closed-loop control of normal stress and shear torque/rotation with real-time torque–displacement plots and auto detection of peak, post-peak, and residual states.
Cyclic scheduler supports amplitude, mean bias, frequency, and cycle count; waveform options include sinusoidal, triangular, block/step, and user-defined sequences for service-load or seismic-style protocols.
High-fidelity data acquisition synchronizes shear torque, rotation/displacement, normal stress/strain, and optional pore-water pressure for partially saturated materials, producing residual envelopes and degradation curves.
Modular tooling accommodates fine- to coarse-grained soils and weak rock gouge, with interchangeable rough/smooth rings, drainage paths, and specimen spacers for repeatable boundary conditions.
