SOIL DISPLACEMENT UNDER A CIRCULAR LOADED AREA

THE PURPOSE IS TO INDICATE A METHOD OF COMPUTING VERTICAL DISPLACEMENT IN SOIL DUE TO A UNIFORM LOAD OVER A CIRCULAR AREA BY THE USE OF TRIAXIAL COMPRESSION TEST DATA. THE VERTICAL DISPLACEMENT OF SETTLEMENT SO COMPUTED IS THAT CAUSED SOLELY BY LATERAL YIELD OF THE SOIL. IT IS ASSUMED THAT THIS TYPE OF SETTLEMENT IS COMPLETED PRIOR TO THE REALIZATION OF ANY SETTLEMENT DUE TO CONSOLIDATION OF THE SUPPORTING SOIL. IN THE COMPUTATIONS A MODULUS OF DEFORMATION IS USED IN THE FORMULAS INSTEAD OF THE MODULUS OF ELASTICITY, AND, SINCE IT IS ASSUMED THAT THE SETTLEMENT OCCURS AT CONSTANT VOLUME, POISSON'S RATIO IS NECESSARILY EQUAL TO 0.5. THE MODULUS OF DEFORMATION IS HEREIN DEFINED AS THE RATIO OF STRESS TO DEFORMATION WITHOUT REGARD TO THE NATURE OF THE DEFORMATION WHETHER IT BE ELASTIC OR PLASTIC DEFORMATION OR BOTH. THE METHOD OF ANALYSIS USED IN THIS PAPER FOR THE CASE OF A UNIFORM LOAD OVER A CIRCULAR AREA MAY BE APPLIED, WITH CERTAIN MODIFICATIONS, FOR THE CASE OF A PARABOLIC OR CONICAL DISTRIBUTION OF LOAD OVER THE CIRCULAR AREA. THE PROCEDURE USES LABORATORY STRESS- DEFORMATION CURVES OF THE SUBGRADE SOIL IN CONJUNCTION WITH RATIONAL THEORETICAL ANALYSES. THIS METHOD OF APPROACH DOES NOT INCLUDE THE MAKING OF PENETRATION AND LOADING TESTS DIRECTLY ON THE SUBGRADE, A PROCEDURE THAT HAS VARIOUS DISADVANTAGES. A CORRELATION BETWEEN MEASURED DEFLECTIONS OF THE SUBGRADE UNDER WHEEL LOAD AND THE DEFLECTIONS COMPUTED FROM LABORATORY TEST DATA AND THEORY IS AN INDICATED EXPERIMENTAL PROCEDURE THAT SHOULD EXTEND OUR KNOWLEDGE IN THIS FIELD. /AUTHOR/

  • Supplemental Notes:
    • Vol 20, pp 279 - 286, 4 FIG, 2 TAB
  • Authors:
    • Palmer, L A
    • Barber, E S
  • Publication Date: 1941

Media Info

  • Monograph Title: Proceedings of the Twentieth Annual Meeting of the Highway Research Board Held at Washington, D.C. December 3-6, 1940
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00233056
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 1971 12:00AM