P4b-3. Non-Linear Relationships between Hydrological Properties and Strain
Project leader: Mohammad Saadatfar (Applied Maths, RSPhys ANU)
Industry partner: David Beck, Beck Engineering
- Stressed rocks in mines can be damaged by boundary stresses or hydraulic fracturing. We aim to the coupled relationship of fluid and rock in this context.
- To provide hydrological parameters into non-linear hydro-mechanical model to allow higher resolution analysis of the impacts of water on the mine.
- To estimate permeability change and hydro-mechanical process and coupling between flow and strain.
Alignment within M3D Innovation:
- Dynamic experiments and modelling for Materials characterisation.
- Overlap with Energy and Resources industry projects.
- Ex-situ and in-situ tests will be carried out to parametrise core strength from various depths, chemistry (mineralogy) and heterogeneity.
- XCT scans will be utilised to quantify hard rock (>70MPa) textures of prior to testing, midway through the triaxial test and after failure.
- Various stress paths will be implemented to determine fracture nucleation.
- In-situ experiments using triaxial apparatus will be carried out to find correlation between rock mechanics and pore pressure.
- The hydromechanical relationships from the triaxial and permeability testing will be used to validate FE modelling.
- Selection of specimens relevant to mine and modelling project,
commence X-CT scanning and analysis. [Complete]
- Perform triaxial permeability test on low strength 12mm. [Complete]
- Perform ex-situ mechanical tests on hard rocks (June-2021). [Underway]
- Perform triaxial permeability test work on larger cores (25mm)
- Results from analysis integrated into coupled hydrological