DYNAMIC BEHAVIOR OF EMBEDDED FOUNDATION-SOIL SYSTEMS

DEVELOPMENT OF THEORETICAL SOLUTIONS TO THE PROBLEMS OF DYNAMIC INTERACTION BETWEEN FOUNDATION AND UNDERLYING SOILS IS DISCUSSED WITH A VIEW TO IDEALIZATIONS AND UNCERTAINTIES ASSOCIATED WITH THE THEORIES, WITH A PARTICULAR EMPHASIS ON THE EFFECT OF EMBEDMENT ON THE INTERACTION. AN EXPERIMENTAL INVESTIGATION TO STUDY THE DYNAMIC BEHAVIOR OF EMBEDDED FOUNDATION-SOIL SYSTEMS IS DESCRIBED. BASED ON SMALL-SCALE MODEL TESTS ON FOOTINGS OF VARIOUS SIZES AND SHAPES, EVALUATION IS MADE OF THE EFFECT OF EMBEDMENT DEPTH, MASS RATIO, AND FOUNDATION SHAPE ON THE DYNAMIC RESPONSE OF THE SYSTEM. IT IS FOUND THAT THE AMPLITUDE OF MOTION OF THE EMBEDDED FOUNDATION IS GREATLY REDUCED BY THE ADDITIONAL SHEARING RESISTANCE ALONG SIDES OF THE FOUNDATION AND A SHIFT IN THE CONTACT PRESSURE DISTRIBUTION. EMBEDMENT IS FOUND, HOWEVER, TO HAVE NO APPRECIABLE EFFECT ON THE RESONANT FREQUENCY OF THE SYSTEM. THE SYSTEM WITH A HIGHER MASS RATIO PRODUCES A GREATER AMPLITUDE FOR A GIVEN DEPTH OF EMBEDMENT, BUT THE EFFECT OF MASS RATIO BECOMES SMALLER WITH INCREASING EMBEDMENT DEPTH. THE EFFECTS OF EMBEDMENT DEPTH, MASS RATIO, AND FOUNDATION SIZE ARE EXPRESSED IN TERMS OF TWO NEWLY DEFINED DIMENSIONLESS PARAMETERS, THE AMPLITUDE REDUCTION COEFFICIENT AND THE EMBEDMENT FACTOR, BY MEANS OF WHICH THE DYNAMIC RESPONSE OF EMBEDDED FOUNDATIONS CAN BE ADEQUATELY DETERMINED. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 49-59
  • Monograph Title: Landslides; Slope Protection and Stability; Embankment Design and Stability
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00235857
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: May 3 1971 12:00AM