Home >> Products >> Biaxial & Triaxial Testing Machines >> Geotechnical Dynamic Triaxial Testing Machine
Advanced Dynamic Triaxial Testing System

Geotechnical Dynamic Triaxial Testing Machine

Model: UT1072SC, ASTM D3999, ASTM D5311

UnitedTest UT1072SC Geotechnical Dynamic Triaxial Testing Machine can accurately simulate the true three-dimensional complex stress state of geotechnical materials in nature (σ₁ > σ₂ > σ₃), breaking the limitations of conventional triaxial tests (σ₂ = σ₃), and providing more realistic and reliable mechanical parameters and stability assessment references for geotechnical engineering, energy development, and geological disaster prevention. It is mainly used for three-dimensional loading and unloading tests on soft soil samples, as well as conducting shear tests, creep tests, and other experiments under triaxial conditions. The equipment features independent rigid loading and unloading capabilities in two directions; the system has force and displacement control modes, which can be smoothly switched between. The entire test process is controlled, with automatic acquisition and processing of test data. 

Conform with standard: 

ASTM D3999: Standard Test Methods for the Determination of the Modulus and Damping Properties of Soils Using the Cyclic Triaxial Apparatus

General introduction

UnitedTest UT1072SC Geotechnical Dynamic Triaxial Testing Machine can accurately simulate the true three-dimensional complex stress state of geotechnical materials in nature (σ₁ > σ₂ > σ₃), breaking the limitations of conventional triaxial tests (σ₂ = σ₃), and providing more realistic and reliable mechanical parameters and stability assessment references for geotechnical engineering, energy development, and geological disaster prevention. It is mainly used for three-dimensional loading and unloading tests on soft soil samples, as well as conducting shear tests, creep tests, and other experiments under triaxial conditions. The equipment features independent rigid loading and unloading capabilities in two directions; the system has force and displacement control modes, which can be smoothly switched between. The entire test process is controlled, with automatic acquisition and processing of test data. 

Conform with standard: 

ASTM D3999: Standard Test Methods for the Determination of the Modulus and Damping Properties of Soils Using the Cyclic Triaxial Apparatus


Multistage Triaxial Testing System can complete the full process curve test of uniaxial/triaxial compression of rocks (soft rocks) at room temperature. Complete the full process curve test of uniaxial/triaxial compression of rocks (soft rocks) in high and normal temperature environments. Under uniaxial and triaxial conditions, perform acoustic emission testing.

Geotechnical Dynamic Triaxial Testing Machine

Key Features

  • Main functions
  • Environmental Working Conditions

2.1. The triaxial testing system is capable of applying unequal principal stresses in three directions to soil and measuring soil strain in all three directions. The triaxial apparatus can simulate the strength and deformation behavior of soil under real stress conditions.
2.2. Depending on the drainage conditions of the sample, unconsolidated undrained (UU), consolidated undrained (CU), and consolidated drained (CD) tests can be conducted.
2.3. Stress path-controlled tests (including p-q and s-t modes).
2.4. It can perform triaxial tests, K0 consolidation, true triaxial tests on unsaturated soils, and cyclic loading tests for both unsaturated and saturated soils.
2.5. It can conduct dynamic true triaxial tests on saturated and unsaturated soil samples.
2.6. It can perform bending element tests and carry out P-wave and S-wave shear tests.
2.7. True triaxial tests under temperature-controlled conditions for both saturated and unsaturated soils can be performed.
2.8. The test process is automatically controlled by a microcomputer, allowing the test to maintain constant conditions for a long duration.
2.9. It can effectively control the stress paths of σ1, σ2, and σ3 and ensure that the test curves coincide with the preset stress paths.
2.10. A microcomputer data acquisition system automatically collects, displays, stores, and analyzes test data, allowing real-time display of test data curves and reconstruction of the test process. Test curves and reports can be printed.
2.11. Equipped with automatic protection functions, it will alarm and automatically stop operation if the set limits for overpressure, overload, or excessive displacement are exceeded.

1. Room temperature: 10℃~35℃

2. Humidity: ≤80%

3. Operating power supply: Three-phase 380V ±10%, 50Hz

4. Computer power supply: Single-phase 220V ±10%, 50Hz

5. Environment free from strong vibrations, corrosive media, and strong electromagnetic interference

6. Installed level on a stable foundation.

Main Technical Specification

Vertical (σ1) direction  1) Double actuators, loaded in opposite directions; maximum load 40kN
  2) Upper actuator is dynamic, working frequency 5Hz
  3) Measurement accuracy: ±1%FS
  4) Maximum stroke: 50mm
  5) Loading speed: 0.01–60m/min
Horizontal   (σ2) Direction  1) Dual actuators, loaded in opposite directions; maximum loading force 40 kN
  2) Measurement accuracy: ±1% FS
  3) Maximum stroke: 50 mm
  4) Loading speed: 0.01–60 m/min
Confining Pressure (σ3) Direction  1) Maximum confining pressure: 4 MPa (starting from 2% of full scale)
  2) Measurement accuracy: ±1% FS
Deformation Measurement System  1) Measured using a rebound-type LVDT sensor
  2) Range: 0-12.5 mm
  3) Accuracy: ±0.001 mm
Temperature System  1) Temperature range: -20℃ to 85℃
  2) Temperature sensor: PT100
  3) Temperature instrument display resolution: 0.01℃
Pulse   Frequency0.001-1HZ
Pore Water System  1) Back Pressure σb:   0~500 kPa, measurement accuracy error ±0.2% F.S, resolution 1 kPa
  2) Pore Water Pressure: 0~2000 kPa, measurement accuracy error 0.2% F.S, resolution 1 kPa (saturated soil test)
  3) Pore Water Pressure: -30~500 kPa, accuracy error ±0.2% F.S (unsaturated soil test)
  4) Sample Volume Change: 0~200 mL, resolution 0.001 mL
Back Pressure System  1) Minimum Displacement: ≥ 200 mL
  2) Minimum Pressure Rating: ≥ 4 MPa
  3) FRO Volume Accuracy: ≤ 0.25%
  4) FRO Pressure Accuracy: ≤ 0.15%
  5) Volume Resolution: 0.001 mL
  6) Pressure Resolution: 1 kPa
Fully Digital Controller  1) The host loading and   dynamic control system's action control is carried out using the high-performance EDCi series digital measurement controller produced by DOLI Company in Germany.
  2) Uses an AMD high-frequency processor as the controller's main CPU, providing faster processing speed and shorter response time.
  3) High measurement resolution of ±250,000 counts enables high-precision measurement.
  4) Full-range stepless technology.
  5) High transmission rate, with a maximum transmission speed of up to 1KHz, delivering top-level three-loop control.
  6) Nonlinear correction technology.
  7) Intelligent application technology of sensors ensures a highly stable and reliable controller.
Environmental Conditions and Requirements for Normal Equipment Operation1. Room temperature: 10℃~35℃
2. Humidity: ≤80%
3. Operating power supply: Three-phase 380V ±10%, 50Hz
4. Computer power supply: Single-phase 220V ±10%, 50Hz
5. Environment free from strong vibrations, corrosive media, and strong electromagnetic interference
6. Installed level on a stable foundation


Main Accessories

ItemSpecQuantity
MainframeIntegral forging1   set
Axial actuatorServo motor actuator2   sets
Horizontal actuatorServo motor actuator2   sets
Load sensor40kN4   sets
Pressure sensor4Mpa2   sets
Deformation sensorLVDT structure 0-12.5mm3   sets
Back pressure loading systemLoading capacity 0~500kPa1   set
Pore water loading system-30~2000kPa1   set
Pore gas loading system0~1000kPa1   set
Confining pressure loading systemLoading capacity 0~1000kPa1   set
Temperature system-30℃~100℃1   set
Sample volume change measurement devicemeasures sample volume change 0-200ml1   set
Full digital servo controllerDoli EDCi204   sets
Computer and systemi5/4GB or above1   set
Software systemWindows platform testing software1   set
Electrical control systemself-made1   set
Documents (Manual, packing list, certificate)


Standard

ASTM D3999 Soil Secant Modulus and Damping Coefficient by Dynamic Cyclic Triaxial Testing

ASTM D3999 applies to both intact and reconstituted soil specimens and focuses on hydrostatically consolidated, undrained conditions. The standard provides two test methods: one using constant cyclic load (Method A) and the other using constant cyclic deformation (Method B). These properties are essential for evaluating soil behavior under dynamic loads such as earthquakes, ocean waves, or blasts, and are used in geotechnical engineering analyses. 

ASTM D5311 Load Control Cyclic Triaxial Strength Test of Soil

ASTM D5311 specifies procedures for evaluating the cyclic response and strength of saturated soils under load-controlled cyclic triaxial testing, primarily to assess liquefaction potential and dynamic behavior under earthquake or other cyclic loading conditions.

Require More Customized Solutions?

We offer customization to meet your specific needs. Our expert team will collaborate with you to develop the perfect product for you
Customize Now

Beijing United Test Co., Ltd.