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Hydrogeological testing to characterize a fractured granite

  • Witherspoon P. A. 
  • Gale J. E. 
International Symposium Soil and Rock Investigation by In Situ Testing Thème 3 Hydraulical and Hydrogeological Testing, to Determine the Permeability of the Pores or Transmissivity of the Fractures
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Abstract

A comprehensive program of in situ testing has been carried out in an iron ore mine in Stripa, Sweden, to investigate the problems of obtaining a hydrogeological characterization of a fractured granite rock mass. The field investigations consisted of: (1) the collection of fracture geometry and borehole injection test data to determine directional permeabilities, (2) a macropermeability experiment to determine the bulk rock mass permeability, (3) groundwater sampling for investigations of geochemistry and isotope hydrology, (4) pump testing of surface wells, and (5) tracer tests to determine effective porosity. This report summarizes results from all but the last item, the tracer work, which had not been carried out when the field work ended in 1981.

Keywords

Rock Mass Fracture Aperture Trace Length Fracture Porosity Isotope Hydrology 

Essais Hydrogeologiques Pour Caracteriser un Granite Fracture

Résumé

Un programme complet d'expérimentations in situ a été mené dans la mine de fer de Stripa (Suède) pour déterminer les caractéristiques des écoulements dans un massif granitique fissuré. Les opérations de terrain ont été les suivantes: (1) recueil des données sur la géométrie des fractures et essais d'injection en forages pour déterminer les perméabilitités directionnelles. (2) expérience de macroperméabilité pour déterminer la perméabilité matricielle, (3) échantillonnages des eaux en vue d'analyses chimiques et isotopiques, (4) essais de pompage sur puits forés depuis la surface du sol, (5) traçages chimiques pour détermination de la porosité effective. La présente publication en résume les résultats. Seule l'expérience de traçage n'a pu être réalisée avant l'arrêt des travaux en 1981.

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References

  1. BAECHER G.B., LANNEY N.A. and NICHOLAS A., (1978): Trace Length Biases in Joint Surveys. Proc. 19th U.S. Rock Mechanics Symposium, pp. 56–65.Google Scholar
  2. BAECHER G.B., (1980): Progressively Censored Sampling of Rock Joint Traces. Mathematical Geology, 12, (1), pp. 133–137.Google Scholar
  3. FEUGA, B., (1983): Caractérisation du Milieu Poreux Equivalent à un Milieu Rocheux Fracturé par Essais à l'AuIn Situ, paper presented at this symposium.Google Scholar
  4. FRITZ P., BARKER J.F. and GALE J.E. (1979): Geochemistry and Isotope Hydrology of Groundwaters in the Stripa Granite. Lawrence Berkeley Lab. Rep. LBL-8285, SAC-12.Google Scholar
  5. FRITZ P., BARKER J.F. and GALE J.E., (1983): Summary of Geochemical Activities at the Stripa Site During FY79/80. Lawrence Berkeley Lab. Rep. LBL-11864 (in preparation).Google Scholar
  6. GALE J.E. and WITHERSPOON P.A., (1979): An approach to the Fracture Hydrology at Stripa, Preliminary Results. Lawrence Berkeley Lab. Tep. LBL-8079, SAC-15.Google Scholar
  7. GALE, J.E., (1983 a): Fracture and Hydrology Data from Field Studies at Stripa, Sweden. Lawrence Berkeley Lab. Rep. LBL-13101 (in preparation).Google Scholar
  8. GALE J.E., (1983 b): Hydrogeologic Characteristics of the Stripa Site. Lawrence Berkeley Lab. Rep. LBL-14878 (in preparation).Google Scholar
  9. KNAPP R.B., (1975): An Analysis of the Porosities of Fractured Crystalline Rocks. Univ. Arizona, M.S. Thesis, 90 p.Google Scholar
  10. LONG J.C.S., WITHERSPOON P.A., WILSON C.R. and DUBOIS A.O., (1980): Large-Scale Permeability Testing at Stripa. Proc. Third Invitational Symposium on Well-Testing in Low Permeability Environments, Lawrence Berkeley Lab. Rep. LBL-12076.Google Scholar
  11. LONG J.C.S., REMER J.S., WILSON C.R. and WITHERSPOON P.A., (1982): Porous Media Equivalents for Networks of Discontinuous Fractures. Water Resources Res. 18 (3), pp. 645–658.CrossRefGoogle Scholar
  12. PAULSSON B.N.P., NELSON P.H. and KURFURST P.J., (1983): Characterization of Discontinuities in the Stripa Granite-Full Scale Heater Experiments. Lawrence Berkeley Lab. Rep. LBL-9063 (in preparation).Google Scholar
  13. ROULEAU A. and GALE J.E., (1982): Characterizin Fracture Systems for Hydrogeological Purposes—Application to the Gneissic Bedrock at Chalk River. Atomic Energy of Canada, Tech. Rep. (in press).Google Scholar
  14. ROULEAU A. and GALE J.E., (1983): Characterization of the Fracture System at Stripa, Lawrence Berkeley Lab. Rep. LBL-14875 (in preparation).Google Scholar
  15. ROULEAU A., GALE J.E. and BALESHTA J., (1983): Results of Fracture Mapping in the Ventilation Drift-Stripa, Lawrence Berkeley Lab. Rep. LBL-13071 (in preparation).Google Scholar
  16. THORPE R., (1979): Characterization of Discontinuities in the Stripa Granite Time-Scale Heater Experiment. Lawrence Berkeley Lab. Rep. LBL-7083, SAC-20.Google Scholar
  17. WITHERSPOON P.A. and DEGERMAN O., (1978): Swedish-American Cooperative Project on Radioactive Waste storage in Mined Caverns. Lawrence Berkeley Lab. Rep. LBL-7049, SAC-01.Google Scholar
  18. WITHERSPOON P.A., NELSON P., DOE T., THORPE R., PAULSSON B., GALE J., and FORSTER C., (1979): Rock Mass Characterization for Storage of Nuclear Waste in Granite. Lawrence Berkeley Lab. Rep. LBL-8570, SAC-18.Google Scholar
  19. WITHERSPOON P.A., WILSON C.R., LONG J.C.S., GALBRAITH R.M., DUBOIS A.O., GALE J.E. and McPHERSON M.J., (1980): Mesures de Perméabilité en Grand dans les Roches Cristallines Fracturées. Bull. B.R.G.M. III (1), pp. 53–61.Google Scholar

Copyright information

© International Association of Engineering Geology 1982

Authors and Affiliations

  • Witherspoon P. A. 
    • 1
  • Gale J. E. 
    • 2
  1. 1.Lawrence Berkeley Laboratory and University of CaliforniaBerkeleyUSA
  2. 2.Memorial University of NewfoundlandSt-JohnsCanada

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