Geotechnical instrumentation requirements for at-depth testing and repository monitoring in tuff
Abstract
Minimum required geotechnical measurements for confirmation of repository performance include thermal and thermomechanical responses; changes in stress, strain, and displacements; and pore pressure and groundwater flow characteristics. Conditions expected in tuff are: maximum rock temperatures of less than 250 C, stresses less than 100 MPa, strains between +-0.01 mm/mm, and pore pressures less than 35 KPa in the unsaturate zone where hydraulic head is not the primary contributor. The paper describes instrumentation needed to make the desired measurements. In general, the instrumentation and data system are required measurements. In general, the instrumentation and data system are required to be stable and reliable for tens of years. Designs must consider requirements for temperature stability, temperature expansion compensation, moisture resistance, and long-term durability in mining-type environments. Severe requirements such as these suggest consideration of techniques for in-situ replacement of instrumentation. State-of-the-art instrumentation is briefly described along with a discussion of needs for refinement, replacement/recalibration and instrumentation development.
- Publication:
-
Presented at IEEE Nucl. Sci. Symp
- Pub Date:
- October 1982
- Bibcode:
- 1982nusc.symp.....Z
- Keywords:
-
- Geology;
- Ground Water;
- Moisture;
- Radioactive Wastes;
- Site Selection;
- Thermodynamics;
- Waste Disposal;
- Deposition;
- Displacement;
- Stress Analysis;
- Stress-Strain Relationships;
- Temperature Measurement;
- Instrumentation and Photography