CLOSURE ON CONSOLIDATION UNDER CONSTANT RATES OF STRAIN

IN THEIR ORIGINAL PAPER, THE AUTHORS PROPOSED A THEORETICAL MODEL OF THE CONSTANT RATE OF STRAIN CONSOLIDATION TEST (CRS TEST) THAT WOULD PERMIT DETERMINATION OF BOTH THE RATE AND MAGNITUDE OF CONSOLIDATION MUCH FASTER THAN IS POSSIBLE WITH CONVENTIONAL PROCEDURES. IN HIS DISCUSSION, BYRNE NOTED THAT THERE MAY BE REASONS OTHER THAN THE B/R RATIO (DIMENSIONLESS VOID RATIO CHANGE RATIO) FOR DIFFERENCES BETWEEN THE CRS AND CONVENTIONAL, INCREMENTALLY LOADED TESTS AND QUESTIONED THE USE OF B/R = 1. HOWEVER, CURRENT ENGINEERING PRACTICE UTILIZES THE RESULTS OF CONVENTIONAL ONE-DIMENSIONAL CONSOLIDATION TESTS. IN THE WRITERS' CRS TEST, THESE RESULTS WERE APPROXIMATED MOST CLOSELY WHEN B/R = 1. BYRNE ADVOCATES THE USE OF VERY SLOW STRAIN RATES FOR WHICH B/R APPROACHES ZERO. THIS SUGGESTION HAS MUCH MERIT FOR EVALUATING VOID RATIO-EFFECTIVE STRESS RELATIONS BECAUSE IT GREATLY SIMPLIFIES THE THEORY. HOWEVER, THE TEST DURATION MAY BE INCREASED SIGNIFICANTLY. FURTHERMORE, BECAUSE THE PORE PRESSURES DEVELOPED WILL BE VERY SMALL, RELIABLE EVALUATIONS OF THE COEFFICIENT OF CONSOLIDATION WILL BE EXTREMELY DIFFICULT. BYRNE HAS POSTULATED THAT FOR VERY RAPID STRAIN RATES B/R MIGHT APPROACH 2 WHILE U/O REMAINED LESS THAN 0.5. THESE CONDITIONS APPEAR INCOMPATIBLE IN THE BEHAVIOR OF A REAL SYSTEM. MURRAY'S OBSERVATIONS REGARDING AUTOMATION INDICATE ANOTHER STEP TOWARD PRACTICAL USE OF THIS TEST, AND IT IS ENCOURAGING TO LEARN OF HIS PROGRESS TOWARD THIS END.

  • Supplemental Notes:
    • Vol 97, No SM 1, PP 238-239
  • Authors:
    • Smith, R E
    • Wahls, H E
  • Publication Date: 1971-1

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00235921
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 2 1971 12:00AM