Pilot heater test in the Stripa granite
In the Stripa mine, situated in the central part of Sweden, a pilot heater test has been carried out at 348-m level. The type of rock is a granite with a rather high frequency of fractures. A central main heater with a length of 3 m, a diameter of 30 cm and a total power of 6 kW was placed at the bottom of a 10-m-deep borehole. At different radial distances, varying from 0.85 m up to 2.95 m from the heater, stress and temperature changes were monitored. Additional measurements of movements along major fractures on the surface and changes of water inflow in boreholes were carried out. The measured temperature distribution compares fairly well with the predicted. A maximum temperature of 333.9/sup 0/C was measured. The thermal conductivity of the rock mass has been calculated to lambda = 4.8 W/m/sup 0/C. The thermally induced stresses in the rock mass do not correspond well with the predicted values. Results of measurements in boreholes of the in situ modulus are found to be about half of the laboratory determinations. Displacements of major fractures on the floor of the test drift are very small.
- Research Organization:
- Tekniska Hoegskolan, Luleaa (Sweden); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6477982
- Report Number(s):
- LBL-7086; SAC-06; TRN: 79-007609
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GRANITES
ROCK MECHANICS
FRACTURES
GEOLOGIC DEPOSITS
HEAT TRANSFER
RADIOACTIVE WASTE DISPOSAL
RADIOACTIVE WASTE STORAGE
STRESS ANALYSIS
SWEDEN
THERMAL CONDUCTIVITY
UNDERGROUND DISPOSAL
UNDERGROUND STORAGE
ENERGY TRANSFER
EUROPE
FAILURES
IGNEOUS ROCKS
MANAGEMENT
PHYSICAL PROPERTIES
ROCKS
SCANDINAVIA
STORAGE
THERMODYNAMIC PROPERTIES
WASTE DISPOSAL
WASTE MANAGEMENT
WASTE STORAGE
052002* - Nuclear Fuels- Waste Disposal & Storage