GEOMECHANICAL MODEL STUDY OF THE FAILURE MODES OF JOINTED ROCK MASSES

FIVE PHASES OF INVESTIGATION ABOUT THE BEHAVIOR OF ROCK MASSES DEVELOPMENT OF A ROCK-LIKE MODEL MATERIAL ARE DISCUSSED; DESIGN AND CONSTRUCTION OF THE LOADING APPARATUS; DEVELOPMENT OF A COMPLETE INSTRUMENTATION SYSTEM; TESTING OF JOINTED AND UNJOINTED MODELS; AND ANALYSIS, INTERPRETATION, AND PRESENTATION OF THE TEST DATA. A SERIES OF 19 TESTS WAS CONDUCTED ON JOINTED AND UNJOINTED MODELS. EACH MODEL MEASURES APPROXIMATELY 22 X 22 X 6 IN. THE FAILURES OF THE JOINTED MODEL ROCK MASSES ARE OBSERVED AND STUDIED AS A FUNCTION OF INTACT BLOCK GEOMETRY, CONFINING PRESSURE, JOINT ORIENTATION, AND JOINT ROUGHNESS. COMPARISONS ARE MADE BETWEEN THE JOINTED MODEL TEST RESULTS, THE INTACT MODEL TEST RESULTS, AND TRIAXIAL AND DIRECT SHEAR TEST RESULTS CONDUCTED ON THE SAME MODEL MATERIAL. THE SEQUENTIAL FAILURE OF A JOINTED ROCK MASS OCCURS IN TWO STAGES. STAGE 1 FAILURE IS INITIAL SLIP ALONG JOINTS STAGE II FAILURE OCCURS AFTER BLOCK INTERLOCK AS A TENSILE FAILURE THAT PRODUCES VERTICAL CRACKS PERPENDICULAR TO THE PLANE OF THE SIGMA 1 AND SIGMA 2 STRESSES. ADDITIONAL SUPPLEMENTARY FAILURES OCCUR THAT ARE A FUNCTION OF THE PLANE STRESS LOADING SYSTEM AND ARE NOT GENERALLY CHARACTERISTIC OF A ROCK MASS. /AUTHOR/

  • Supplemental Notes:
    • Tech Rept MRDL-71, 401 PP
  • Corporate Authors:

    U.S. Army Corps of Engineers

    Missouri River Division
    ,   United States 
  • Authors:
    • Rosenblad, J L
  • Publication Date: 1971-1

Subject/Index Terms

Filing Info

  • Accession Number: 00229967
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 29 1971 12:00AM