Rock Triaxial Compression Cell Sample Testing Apparatus
Main application
Triaxial compressive strength test: Simulate the rock failure behavior under confining pressure (σ ₂=σ ∝) and axial pressure (σ ₁).
Stress strain analysis: Determine the elastic modulus (E), Poisson's ratio (ν), peak strength, and residual strength of rocks.
Permeability testing (optional): Study the permeability characteristics of rocks under different stress states (such as shale and sandstone).
Rheological experiment (optional): Long term creep or relaxation characteristic testing.
High temperature and high pressure (HTHP) experiment: simulating deep geological environments (such as oil and gas reservoirs, geothermal development)
Testing Principles
-Rock samples (usually with a diameter of 25~50mm and a height of 50~100mm) are placed in a pressure chamber and subjected to hydrostatic pressure (σ ₂=σ ∝).
-Gradually increase the axial stress (σ ₁) until the specimen fails, and record the stress-strain curve.
-Analyze strength parameters (cohesive force c, internal friction angle φ) according to the Mohr Coulomb criterion or the Hooke Brown criterion.
Operation process
1. Sample preparation: Drill cylindrical core and grind the end face flat (flatness ≤ 0.02mm).
2. Encapsulation sample: Cover with a rubber sleeve and install a strain sensor.
3. Install into pressure chamber: After sealing, inject hydraulic oil and eliminate bubbles.
4. Apply confining pressure: Set the initial confining pressure according to the experimental requirements (such as 5MPa, 10MPa...).
5. Axial loading: Compress at a constant strain rate until failure occurs.
6. Data recording: The software automatically saves data such as load, deformation, and acoustic emission.
7. Result analysis: Calculate strength, modulus, and failure mode (shear, tensile, or plastic flow).
Parameter
1. Hydraulic axial pressure loading device: 1500kN, accuracy ± 12N
2. Three axis pressure chamber: includes a steel body and two steel end caps. When installing the sample, the two end caps are tightened and two self sealing joints are also included. One is used for lateral confining pressure and is connected to the hydraulic control system, and the other is connected to the hydraulic pressure control system to test penetration and pore pressure. Thick walled seamless steel material, capable of withstanding high pressure of 80MOa
3. Sample size: ¥ 50mm × 100mm ￠25 × 100mm can also be matched with other sizes.
4. Lateral confining pressure loading: 0-50MPa, with an accuracy of 0.1MPa. Set a constant pressure at will, displayed on LCD, and digitally controlled.
5. Reverse pressure infiltration: 0~16MPa, with an accuracy of 0.1MPa. Set a constant pressure at will, displayed on a LCD, and digitally controlled. Optional.
6. Axial compression deformation (rebound) range: 0-10mm ± 0.001mm
7. Lateral deformation range: 0-4mm ± 0.001mm
8. Poisson's ratio: axial deformation to lateral deformation ratio
9. Size of upper and lower pressure plates of the press machine: ¥ 300mm
10. Press machine upper and lower pressure plates. Large spacing: 400mm
11. Press piston. Large stroke: 50mm
12. Power supply: 380V ± 10%, 50Hz
13. Working medium of rock pressure chamber: hydraulic oil
14. Overall dimensions of the press (length × wide × Height (mm): 890 × four hundred and fifty × one thousand three hundred and forty
15. Real time collection, analysis and evaluation of data during rock triaxial testing process are carried out through automatic collection and analysis software.
Rock radial deformation meter
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