ROCKFILL

THE PAPER DESCRIBES THE $150,000 ROCK TRIAL CARRIED OUT TO ASCERTAIN THE OPTIMUM METHOD OF BLASTING AND THE MAXIMUM SIZE OF MATERIAL AND LAYER THICKNESS WHICH IT WAS APPROPRIATE TO SPECIFY FOR THE PENNINE CONTRACT ON THE M62. THE MAIN CONTRACT INVOLVED THE EXCAVATION OF ABOUT 6 MILLION CUBIC METRES OF ROCK CONSISTING OF FIVE DIFFERENT SANDSTONES AND MUDSTONES. THE SPREADING AND COMPACTION TECHNIQUES DEVELOPED IN THE TRIAL ENABLED THE RELATIVELY SOFT ROCKS TO BE PLACED WITH LOW AIR CONTENTS. THE DRILLING AND BLASING TECHNIQUES EMPLOYED TO FRAGMENT THE ROCK TO PRODUCE A SATISFACTORY GRADING AT AN ECONOMIC COST ARE DESCRIBED. THE MAIN EMBANKMENT IS A COMBINED MOTORWAY EMBANKMENT AND DAM SOME 75M IN HEIGHT. MEASUREMENTS CARRIED OUT USING THE COMPREHENSIVE INSTRUMENTATION INCORPORATED IN IT SHOWED THAT SETTLEMENT DUE TO UNDER-COMPACTION WAS NEGLIGIBLE. IT MAY THEREFORE BE CONCLUDED THAT PROVIDED THE NECESSARY SAFEGUARDS ARE UNDERTAKEN, SOFT ROCKS CAN BE PLACED IN THICK LAYERS WITHOUT DETRIMENT TO PERFORMANCE BUT WITH SUBSTANTIAL SAVINGS IN EXCAVATION COSTS (A).

  • Authors:
    • Forrester, G R
    • Hunter, G S
  • Publication Date: 1971-12

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Filing Info

  • Accession Number: 00236926
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: Sep 25 1972 12:00AM