FINITE ELEMENT STUDIES OF 'PILE DRIVER' TUNNELS INCLUDING CONSIDERATIONS OF SUPPORT REQUIREMENTS

THE CURRENT FINITE ELEMENT MODEL FOR JOINTED ROCKS IN THE CONTEXT OF THE PILEDRIVER EXPERIMENT. THE REPORT PRESENTS A COMPREHENSIVE CASE HISTORY OF FINITE ELEMENT APPLICATION AND PARAMETER EVALUATION FOR PILEDRIVER ADDRESSES CR1 AND BR12. THESE TUNNEL SECTIONS WERE SELECTED TO EXAMINE VARIATION OF TUNNEL SIZE WHILE MOST OTHER DESIGN FEATURES REMAINED FIXED. THE RESULTS WERE SENSITIVE TO VALUES OF THE RATIO BETWEEN SHEAR AND NORMAL JOINT STIFFNESS; A VALUE OF K SUB S/K SUB N BETWEEN 1/15 AND 1/20 GAVE THE CLOSEST AGREEMENT BETWEEN ACTUAL AND MODEL DISPLACEMENTS. DEFORMATIONS, STRESSES AND THE EXTENT OF ROCK BREAKAGE WERE NOT SENSITIVE TO CHANGES IN THE INSIDE SUPPORT PRESSURE (P SUB I) WHEN P SUB I WAS LESS THAN 2000 PSI. THE DEGREE OF STABILITY OF DIFFERENT CASES STUDIED WAS REVEALED BY THE CHANGES IN DISPLACEMENTS IN SUCCESSIVE ITERATIONS. IN STABLE CASES, TUNNEL DISPLACEMENTS CONVERGED TOWARDS A FINAL VALUE WHEREAS IN UNSTABLE CASES DIVERGENT BEHAVIOR WAS EXPERIENCED. /AUTHOR/

  • Supplemental Notes:
    • TECH REPT NO 13 3 APP
  • Corporate Authors:

    U.S. Army Corps of Engineers

    ,    
  • Authors:
    • Heuzef, E
  • Publication Date: 1972-11

Media Info

  • Features: Figures; References;
  • Pagination: 136 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00236683
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 16 1974 12:00AM