TRENCH COMPACTION-MEASURES OF COST EFFECTIVENESS

BOND ISSUE PROGRAMS IN THE LOS ANGELES COUNTY FLOOD CONTROL DISTRICT FOR THE RESTORATION OF STREETS ARE DESCRIBED. RELATIVE DENSITY REQUIREMENTS WERE PREDETERMINED AND REPRESENTED AN INCREASE OF 2% OVER THE RELATIVE DENSITIES IN THE UNDISTURBED MATERIAL. CONTRACTORS WERE PERMITTED TO DENSIFY BY MEANS OF MECHANICAL COMPACTION OR BY JETTING, AT THEIR OPTION, EXCEPT FOR THE TOP 2 FT OF BACKFILL, FOR WHICH COMPACTION TO 90% RELATIVE DENSITY WAS REQUIRED. SUFFICIENT TESTING PERSONNEL WERE PROVIDED TO PERMIT AN AVERAGE OF ONE TEST PER 300 FT OF TRENCH FOR EACH 3 FT IN DEPTH OF BACKFILL. SEVERE RAINS CAUSED A NUMBER OF BACKFILL FAILURES. FOLLOWING THIS EXPERIENCE, CHANGES WERE MADE IN SPECIFICATION AND INSPECTION PROCEDURES. MECHANICAL COMPACTION WAS REQUIRED IN MARGINAL SOILS. A COST ANALYSIS OF ADDITIONAL SAFEGUARDS INDICATED THAT THE COST FOR REPAIR DOES NOT JUSTIFY MORE STRINGENT MEASURES THAN ARE PRESENTLY ADOPTED.

  • Corporate Authors:

    Itte, University of California, Berkeley

    Abstracts of 19th California Street & Highway Conference
    ,   United States 
  • Authors:
    • Holston, I S
  • Publication Date: 1967-2

Media Info

  • Pagination: 39 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00214834
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 24 1994 12:00AM