Temperature-Controlled Dynamic Triaxial System for Unsaturated Soil HC-TUMD

Product Introduction

Temperature-Controlled Dynamic Triaxial Testing System for Unsaturated Soil is a state-of-the-art geotechnical testing instrument integrating multi-stress path loading, freeze-thaw environmental coupling and high-frequency vibration. It is specially developed to reveal the hydro-mechanical-thermal multi-field coupling mechanism of unsaturated soil under complex working conditions.

Breaking through the limitations of traditional triaxial testing technology, the system integrates three core technologies: gradient temperature control from -20℃ to +50℃ (accuracy ±0.5℃), dynamic servo loading (up to 5Hz dynamic vibration), and coordinated control of multiphase pressure (confining pressure / pore air pressure / pore water pressure). It enables full-process simulation of cutting-edge research topics such as loess collapse, cyclic drying-wetting of expansive soil, and freeze-thaw interface effects.

The system is equipped with an advanced full-surface deformation digital image measurement system. Adopting non-contact measurement technology, it can accurately capture the full-field strain and crack development of unsaturated soil specimens during tests.

Core Product Specifications

• Specimen size: φ39.1 / 50 / 61.8 mm.

• Axial static load: 10 / 20 / 30 / 40 / 50 kN, 0.1% F.S.

• Axial dynamic loading: 0.1~5 Hz, sine / square / triangular / user-defined waveform.

• Confining pressure / back pressure / pore pressure: 1 / 2 / 3 / 4 / 6 MPa, 0.25% F.S.

• Temperature range: -20 ~ +50 ℃, ±0.5 ℃.

• Matric suction: 0~0.9 MPa, 1% F.S. (5 bar high-air-entry ceramic disc).

• Specimen deformation measurement: full-surface strain data around 360° of the specimen.

• Image accuracy: 10⁻⁴ ~ 10⁻⁵ × specimen height.

• Axial loading rate: 0.001~50 mm/min, stepless variable speed.

• Confining / back pressure loading rate: 0.005~25 mm/min, stepless variable speed.

• Confining / back pressure volume: ≥250 ml.

• Maximum flow rate: ≥1000 mm³/s, 0.25% F.S.

• Resolution: 0.1 ml.

 Note: All above parameters are customizable.

Product Functions

• Confining pressure dynamic compensation: Automatically eliminates confining pressure fluctuations caused by axial vibration.

• Drainage measurement: High-precision electronic balance with accuracy 0.001 g and resolution 0.001 g; equipped with evaporation compensation for automatic volume correction.

   Pressure chamber: Made of 304 stainless steel with external thermal insulation and internal lighting; observation window diameter ≥ 125 mm; automatic remote cloud data post-processing.

• Control functions: Automatic control of loading ram travel, loading rate, confining pressure, and pressure chamber water filling/drainage.

• Standard saturated soil triaxial tests: UU, CU and CD tests.

  Saturated soil stress path tests: S-T and P-Q standard stress path tests.

• Saturated soil K₀consolidation: Load control, low-frequency cyclic loading and user-defined stress path tests.

• Unsaturated soil triaxial tests: Isotropic drained tests with constant matric suction, consolidated drained shear tests, and suction increase tests.

• Post-processing software: Data import, validity check, error correction, outlier detection, deformation calculation, strain calculation, data export and curve plotting.

• Test result output: Full strain data output during tests; supports time-history curves and full-field spatial analysis consistent with specimen geometry.

  Main triaxial unit power: Single-phase AC 220 V, peak power from 2 kW (depending on configuration).

• Chiller unit power: Three-phase AC 380 V, peak power 8 kW.

• Main triaxial unit dimensions: 1200 × 600 × 1500 mm.

• Chiller unit dimensions: 465 × 615 × 890 mm.

• Standard accessories: Computer, monitor, keyboard, mouse and test tools.

Note: All above functions are customizable.