Pilot heater test in the Stripa granite

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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 ... continued below

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Pages: 155

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Carlsson, H. August 1, 1978.

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Description

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.

Physical Description

Pages: 155

Notes

Dep. NTIS, PC A08/MF A01.

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  • Report No.: LBL-7086
  • Report No.: SAC-06
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/6477982 | External Link
  • Office of Scientific & Technical Information Report Number: 6477982
  • Archival Resource Key: ark:/67531/metadc1207136

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • August 1, 1978

Added to The UNT Digital Library

  • July 5, 2018, 11:11 p.m.

Description Last Updated

  • Oct. 23, 2018, 12:20 p.m.

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Carlsson, H. Pilot heater test in the Stripa granite, report, August 1, 1978; United States. (digital.library.unt.edu/ark:/67531/metadc1207136/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.