Information on the most widely used ASTM standards within the materials testing industry
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.

Key Features
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 Frequency | 0.001-1HZ |
| 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 Operation | 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 Accessories
| Item | Spec | Quantity |
| Mainframe | Integral forging | 1 set |
| Axial actuator | Servo motor actuator | 2 sets |
| Horizontal actuator | Servo motor actuator | 2 sets |
| Load sensor | 40kN | 4 sets |
| Pressure sensor | 4Mpa | 2 sets |
| Deformation sensor | LVDT structure 0-12.5mm | 3 sets |
| Back pressure loading system | Loading capacity 0~500kPa | 1 set |
| Pore water loading system | -30~2000kPa | 1 set |
| Pore gas loading system | 0~1000kPa | 1 set |
| Confining pressure loading system | Loading capacity 0~1000kPa | 1 set |
| Temperature system | -30℃~100℃ | 1 set |
| Sample volume change measurement device | measures sample volume change 0-200ml | 1 set |
| Full digital servo controller | Doli EDCi20 | 4 sets |
| Computer and system | i5/4GB or above | 1 set |
| Software system | Windows platform testing software | 1 set |
| Electrical control system | self-made | 1 set |
| Documents (Manual, packing list, certificate) | ||
Standard
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 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?