Triaxial Test
The triaxial test is an important method in rock mechanics for determining the strength and deformation characteristics of rock samples. Here's a concise explanation:
Purpose: To measure rock strength and behavior under different confining pressures, simulating underground conditions.
Setup:
- Cylindrical rock sample
- Rubber membrane to seal the sample
- Pressure chamber filled with fluid
- Axial loading piston
Procedure:
- Apply confining pressure via fluid in the chamber
- Increase axial load until sample failure
- Monitor stress, strain, and volume changes
Key parameters measured:
- Compressive strength
- Young's modulus
- Poisson's ratio
- Cohesion and friction angle
Types:
- Conventional: Constant confining pressure
- True triaxial: Independent control of all principal stresses
Applications:
- Tunnel design
- Slope stability analysis
- Oil and gas reservoir characterization