LATERAL PRESSURES ON RETAINING WALLS CAUSED BY SUPERIMPOSED LOADS

DESIGN OF A RETAINING WALL OR ABUTMENT INVOLVES THE DETERMINATION OF THE OVERTURNING AND TRANSLATING FORCES ATTRIBUTABLE TO THE BACKFILLING MATERIAL AS WELL AS THOSE SIMILAR FORCES CAUSED BY THE SUPERIMPOSITION OF LOADS ON THE SURFACE OF THE BACKFILL. STUDIES WERE CONDUCTED ON A SERIES OF RETAINING WALLS, WITH TRUCK WHEEL LOADS IN A UNIFORMLY DISTRIBUTED PARALLEL LINE OR STRIP LOAD APPLIED AT THE SURFACE OF THE GRAVEL BACKFILL AND AT VARIOUS DISTANCES FROM THE BACKFACE OF THE WALL. PRESSURES ON THE WALL WERE MEASURED BY MEANS OF GOLDBECK PRESSURE CELLS AND STAINLESS STEEL FRICTION RIBBONS WHICH WERE MADE TO SLIDE BETWEEN TWO STAINLESS SURFACES AND TO PASS OVER SMALL ROLLERS THROUGH THE WALL SO THAT THE ENDS OF THE RIBBONS WERE AVAILABLE FOR PULLING FROM THE FRONT SIDE OF THE WALL. THESE RIBBONS WERE COVERED WITH SUITABLE FLEXIBLE WATERPROOF COVERING AND WERE CALIBRATED BY MEANS OF AIR PRESSURE TO OBTAIN THE RELATIONSHIP BETWEEN NORMAL PRESSURE ON THE RIBBON AND THE PULL REQUIRED TO START IT IN MOTION. SIMILAR PRESSURE MEASUREMENTS WERE MADE FOR A UNIFORMLY DISTRIBUTED LINE LOAD PARALLEL TO THE WALL DURING THE STUDIES. DATA INDICATE THAT THE LATERAL PRESSURE ON A RETAINING WALL DUE TO A CONCENTRATED SURFACE LOAD IS DISTRIBUTED IN SUBSTANTIALLY THE SAME MANNER AS THAT INDICATED BY THE BOUSSINESQ FORMULA FOR HORIZONTAL STRESS IN AN ELASTIC SOLID DUE TO A POINT LOAD ON THE SURFACE. DIVERGENCE BETWEEN THE EXPERIMENTAL AND THE BOUSSINESQ PRESSURES WAS A VARYING QUANTITY BEING GREATER WHEN THE LOAD WAS CLOSE TO THE WALL. AN EMPIRICAL EQUATION IS PRESENTED WHICH DEFINES A SURFACE APPROXIMATELY PASSING THROUGH POINTS REPRESENTING THE MEASURED NORMAL PRESSURES. PRESSURES DEFINED BY THIS EQUATION CHECK VERY CLOSELY WITH THE MEASURED PRESSURES ON THE EXPERIMENTAL WALL WHEN LOADED BY A PARALLEL LINE LOAD PLACED TWO FEET FROM THE WALL, INDICATING THE VALIDITY OF THE PRINCIPLE OF SUPERPOSITION AND THE PREMISE THAT A LINE LOAD ACTS THE SAME AS A SERIES OF CLOSELY SPACED POINT LOADS. IT IS NOTED THAT THE PATTERN OF DISTRIBUTION OF HORIZONTAL PRESSURES DUE TO SURCHARGED LOADS IS INDEPENDENT OF THE HEIGHT OF THE WALL.

  • Supplemental Notes:
    • Vol 18, ParT 2, PP 57-65, 12 FIG
  • Authors:
    • Spangler, M
  • Publication Date: 1939

Language

  • English

Media Info

  • Monograph Title: Proceedings of the Eighteenth Annual Meeting of the Highway Research Board Held at Washington, D.C. November 28-December 2, 1938. Part II: Soil Mechanics and Soil Stabilization
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00231368
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 2004 1:53AM