CONTRIBUTION TO CORRELATION OF CEMENT ABSORPTION AND LOSS OF WATER IN PRESSURE TESTS FOR FLYSCH ROCKS

THIS PAPER PRESENTS THE ANALYSIS OF CEMENT ABSORPTION (C) IN RELATION TO THE LOSS OF WATER IN PRESSURE TESTS BEFORE GROUTING (Q), CARRIED OUT FOR SEALING UP THE BEDROCK OF 5 DAMS, FOUNDED ON FLYSCH ROCKS (SANDSTONES AND CONGLOMERATES ALTERNATING WITH SHALES). IT HAS BEEN STATED THAT THE TECTONIC DISTURBANCE OF ROCK MASSES HAS A DECISIVE INFLUENCE ON THE RELATION IN QUESTION. THE INFLUENCE OF LITHOLOGY DOES NOT APPEAR IN A DISTINCT WAY, EXCEPT IN THE SHALLY BEDS OR HORIZONS. IN ROCK MASSES SLIGHTLY TECTONICALLY DISTURBED (60% OF ANALYSED CASES), THERE APPEARS A RELATIVELY GOOD CORRELATION C-Q IN ALL EXAMINED REGIONS. THEREFORE IT IS POSSIBLE TO FORESEE THE CEMENT ABSORPTION ON THE BASE OF THE RESULTS OF WATER PRESSURE TESTS EXACT TO 30-50%. IN ROCK MASSES STRONGLY TECTONICALLY DISTURBED, THE CORRELATION C-Q IS WORSE AND IS DIFFERENT FOR EVERY INVESTIGATED REGION. TO ESTABLISH THAT CORRELATION THE PROSPECTIVE GROUTING IS NECESSARY. THE CORRELATION C-Q IS ALSO AFFECTED BY GROUTING TECHNOLOGY (KIND OF GROUT, GROUTING PRESSURE), AS WELL AS BY PERTURBATIONS IN THE COURSE OF GROUTING WORKS (FOR INSTANCE LEAKS OF GROUT). ALL THESE FACTORS SHOULD BE TAKEN INTO CONSIDERATION IN FORESEEING CEMENT ABSORPTION. /AUTHOR/

  • Supplemental Notes:
    • Vol 3, No 6-16, PP 241-246, 4 FIG, 1 TAB, 4 REF
  • Corporate Authors:

    International Society for Rock Mechanics

    Laboratorio Nacional de Engenharia Civil, Avenida do Brasil
    Lisbon 5,   Portugal 
  • Authors:
    • Jawanski, W
  • Publication Date: 1970-9

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00236139
  • Record Type: Publication
  • Report/Paper Numbers: No. 364
  • Files: TRIS
  • Created Date: May 9 1972 12:00AM