THE INFLUENCE OF THE EXECUTION AND MEASUREMENT METHODS ON THE DEFORMABILITY MODULUS OBTAINED IN ROCK MASSES TESTED WITH LARGE-SIZED THIN FLAT JACKS

DETAILS ARE GIVEN OF THE METHOD OF CARRYING OUT TESTS TO DETERMINE THE DEFORMABILITY MODULUS OF ROCK MASSES BY MEANS OF THIN FLAT JACKS PLACED PARALLEL TO THE ROCK. IT WAS FOUND THAT THE TEST METHOD HAS IRREVERSIBLE EFFECTS, BUT THAT ITS INFLUENCE ON DEFORMABILITY VALUES IS LESS THAN THAT OF 6- HOUR CREEP, WHEN 6-HOUR RELAXATION IS PROVIDED BETWEEN TWO CONSECUTIVE TESTS, AND THE MAXIMUM PRESSURE IS ONLY 35% OF THE ULTIMATE LOAD. VOLUME MEASUREMENTS ARE LESS SENSITIVE TO TEST REPETITION THAN THE DIAL GAUGE TECHNIQUE. IN ANY CASE, THE AVERAGE INFLUENCE IS BELOW 8% OF THE ORIGINAL VALUES. TESTED ROCK CONSISTED OF TUFACEOUS MARLS AND SANDSTONES IN SUBHORIZONTAL LAYERS BELONGING TO A DAM SITE ON THE RIVER BAYANO. PANAMA. /RRL/

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 95-7

Subject/Index Terms

Filing Info

  • Accession Number: 00235264
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: Apr 23 1972 12:00AM