DEVELOPMENT OF T-Z CURVES FOR CEMENTED FINE-GRAINED SOIL DEPOSITS

Drilled shaft load-settlement analysis is commonly conducted using load-transfer curves known as t-z curves. These curves are often used for approximate analyses. The peak skin friction is generally assumed to be developed with deflections on the order of 6 to 12 mm or 0.5 to 1 percent of the shaft diameter. This paper reviews the results of several load tests in calcareous cemented fine-grained soils in the arid southwestern United States. Investigators demonstrate that significantly higher deflections are required to develop the peak skin friction in these soils than in the soils for which most of the available curves were developed. Deflections at peak skin friction are typically 25 mm or more. Consequently, an increase in the deflection required is necessary to attain a given fraction of ultimate load. Although cemented soil deposits have high shear-strength parameters, deflections may exceed expectations for working loads.

Language

  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 886-895
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00714631
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 18 1995 12:00AM