ROCK MECHANICS OBSERVATIONS

MENTION IS MADE OF THE LACK OF A RELIABLE THEORY TO PREDICT THE BEHAVIOR OF A ROCK SYSTEM AS AN ASSEMBLY OF ELEMENTS. MANY MEASUREMENT DATA ARE AVAILABLE BUT THE CORRELATION BETWEEN THEORY AND MEASUREMENTS IS VERY OFTEN ONLY ACCIDENTAL. THE EMPIRICAL APPROACH, HOWEVER, ALLOWS PRACTICAL SOLUTIONS TO BE OBTAINED TO MANY PROBLEMS. THE "STRESS RELIEF" METHOD AS EMPLOYED IN UNDERGROUND POWER STATIONS IN TASMANIA IS QUOTED AS AN EXAMPLE. SYSTEMS ANALYSIS, AIDED BY HIGH SPEED COMPUTERS, IS AN EXCELLENT TOOL TO SOLVE IMPORTANT CIVIL ENGINEERING PROBLEMS. THE PROCEDURE ADOPTED BY THE BUREAU OF RECLAMATION POINTS TO THE EVALUATION OF THE SHEAR STRENGTH OF THE ROCK SYSTEM, MAINLY THROUGH RADIAL JACKING, AND IN SITU SHEAR TESTS. OTHER TOPICS FOR RESEARCH ARE BROUGHT TO LIGHT BY THE CONSTRUCTION OF HIGH DAMS (MORE THAN 200 M), ESPECIALLY BY THE INTERACTION BETWEEN THE ARCH AND ROCK ABUTMENTS. SEISMIC ACTION ON DAMS IS DISCUSSED. VERY LITTLE QUANTITATIVE DATA ARE AVAILABLE, AND IT IS DIFFICULT TO QUANTIFY THE SAFETY FACTORS USED IN SEISMIC DESIGN CRITERIA FOR HIGH DAMS. EMPHASIS IS LAID ON THE NEED FOR FORMULATING MORE ACCURATE AND RELIABLE PREDICTION THEORIES BASED ON STRAINS OR DEFORMATIONS AND NOT DEPENDENT UPON STRESSES WHICH CANNOT BE MEASURED OR OBSERVED, AND WHICH ARE EXTRAPOLATED FROM ELASTIC THEORIES. /RRL/

Media Info

  • Features: Figures; Photos; References;
  • Pagination: p. 255-62

Subject/Index Terms

Filing Info

  • Accession Number: 00235243
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: Apr 23 1972 12:00AM