Theoretical t-z Curves

by Leland M. Kraft, Jr., (M.ASCE), Manager; Special Projects Group, McClelland Engrs., Inc., Houston, Tex. 77081,
Takaaki Kagawa, (M.ASCE), Senior Geotechnical Engr.; McClelland Engrs., Inc., Houston, Tex. 77081,
Richard P. Ray, (A.M.ASCE), Grad. Research Asst.; Univ. of Michigan, Ann Arbor, Mich.,

Serial Information: Journal of the Geotechnical Engineering Division, 1981, Vol. 107, Issue 11, Pg. 1543-1561

Document Type: Journal Paper


Most procedures to compute the t-z (stress-displacement) response for axial pile loading are empirical, based mostly on data for pile diameters less than 18 in. (0.15 m) and pile penetrations less than 100 ft (30 m). These procedures may not be appropriate for pile and soil conditions that differ from those on which the procedures were developed. Therefore, a theoretical procedure is developed to generate t-z curves for predicting pile movements under axial load. The procedure uses an approximate one-dimensional, elastic continuum approach to define the t-z response up to the maximum t response and laboratory simulation to define the post-peak response. The procedure was used with several case studies. Predicted response of the pile under axial loading was in good agreement with the measured response.

Subject Headings: Axial loads | Piles | Axial forces | Case studies | Empirical equations | Soil properties | Curvature | Elastic analysis

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