This is a discussion of the effect of the boundary zone mass which shows that its inclusion need not always represent an improvement, but may actually make the solution less suitable for some applications. The basic case of vertical repsonse is examined. The study found that a homogeneous boundary zone with nonzero mass yields undulating impedances and even changes in sign due to wave reflections from the fictitous interface between the two media. These undulating impedances may be less suitable for practical applications than the impedances calculated assuming a massless boundary zone. If the mass of weak zone is neglected in impedance evauation its addition to the pile mass may improve the pile response prediction. The ideal boundary zone should have properties smoothly aproaching those of the outer zone to alleviate wave reflections from the interface.

Media Info

  • Features: Appendices; Figures; References;
  • Pagination: p. 1008-14
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00495287
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 31 1990 12:00AM