Drilled-shaft foundations are used to support building columns, bridge piers, and other structural systems. Researchers investigated the behavior of free-head rigid drilled shafts under static and cyclic lateral and moment loading using laboratory models in relatively large test chambers. Cast-in-place concrete shafts in consolidated and prestressed cohesive soil deposits provided realistic simulation of prototype drilled shafts in clays. The construction procedure incorporated the actual effects of concrete curing and soil/concrete interface roughness, and the soil-deposit preparation included the characteristic anisotropy and overconsolidation associated with natural clays. Twenty-eight cylindrical shafts were constructed and tested. Many of the shafts were instrumented with total stress cells and pore-water stress transducers to allow both total and effective stress measurements during the load testing. The results of the lateral and moment load tests revealed a high degree of nonlinearity in the monotonic static load-displacement response, but it can be represented adequately by a hyperbola. This hyperbola also provides a reference backbone curve for the cyclic loading behavior.


  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 827-835
  • Serial:

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Filing Info

  • Accession Number: 00714625
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 18 1995 12:00AM