ROAD EMBANKMENT STABILISATION BY RETICULATED WALLS

AN EMBANKMENT ALONG MARLDON ROAD IN PAIGNTON HAS RECENTLY BEEN STABILISED BY USING A NEW TECHNIQUE BASED ON SMALL DIAMETER BORED PILES. THE EMBANKMENT CONSISTED OF AN OVERBURDEN MATTRESS OF VARIABLE THICKNESS OVERLYING RED- BROWN SANDSTONE EMBEDDED WITH LAYERS OF CONGLOMERATES; IN SOME PLACES THE TOP SECTION OF THE SANDSTONE WAS MORE OR LESS WEATHERED. THE STATE OF RELAXATION OF THE OVERBURDEN, IN WHICH A THICK VEGETATION WAS THE ONLY STABILISING ELEMENT, WAS GIVING SOME CONCERN IN RELATION TO THE SAFETY OF THE HOUSES ABOVE AND OF THE TRAFFIC IN THE ROAD BELOW. SOME LOCAL SLIPS OCCURRING IN THE RECENT PAST LED TO THE CLOSURE OF THE PEDESTRIAN FOOTPATH RUNNING ACROSS THE EMBANKMENT. A FURTHER PROBLEM FACING THE PUBLIC WORKS DEPARTMENT OF THE COUNTY BOROUGH OF TORBAY WAS THAT THE STABILISATION OF THE EMBANKMENT SHOULD HAVE BEEN COUPLED WITH A SCHEME FOR WIDENING THE MARLDON ROAD. A SOLUTION BASED ON THE REGRADING OF THE SLOPE WOULD HAVE REQUIRED THE SINKING OF THE PILES INTO HARD ROCK WITH ALL THE IMPLICATIONS OF VIBRATIONS CAUSED BY THE CHISELLING. THE PILES, REINFORCED WITH TUBULAR STEEL 60 MM IN DIAMETER, WERE ARRANGED IN A NETWORK PATTERN TO FORM WHAT IS CALLED A 'RETICULATED RETAINING WALL'. THESE WALLS ARE BASED ON THE PRINCIPLE THAT THE PORTION OF GROUND ENCOMPASSED BY A NETWORK OF MANY PILES IS HELD BY THE PILES IN ITS POSITION AND THUS THE SYSTEM OF PILES-GROUND ENCOMPASSED CAN BE REGARDED AS A GRAVITY WALL IN WHICH THE SOIL PROVIDES THE DEAD WEIGHT AND THE PILES THE RESISTING ELEMENTS. ON THE BASIS OF THIS PRINCIPLE, WHICH HAS BEEN WIDELY CONFIRMED BY EXPERIENCE, THE RETICULATED RETAINING WALL CAN BE THUS DESIGNED WITH THE ORDINARY THEORY OF RETAINING WALLS. ONE OF THE MAIN ADVANTAGES OF THIS TYPE OF RETAINING WALL IS THAT IT IS FORMED PRIOR TO THE EXCAVATION, WHICH IS THEREFORE SUBSEQUENTLY CARRIED OUT IN THE PRESENCE OF A WALL ALREADY CAPABLE OF EXERCISING ITS FUNCTION OF RETAINING STRUCTURE AND THUS PREVENTING ANY RELAXATION OF THE GROUND BEHIND. /AUTHOR/

  • Supplemental Notes:
    • Vol 66, No 782, P 992, 2 PHOT, 3 REF
  • Authors:
    • Oriani, M
  • Publication Date: 1971-9

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Filing Info

  • Accession Number: 00236260
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 8 1972 12:00AM