Title: Use of quasi-static friction cone penetrometer data to predict load capacity of displacement piles
Full Citation
Permanent Link: http://ufdc.ufl.edu/UF00098318/00001
 Material Information
Title: Use of quasi-static friction cone penetrometer data to predict load capacity of displacement piles
Physical Description: xiv, 553 leaves : ill. ; 28 cm.
Language: English
Creator: Nottingham, Larry Curtis, 1942- ( Dissertant )
Schmertmann, John H. ( Thesis advisor )
Schaub, James H. ( Reviewer )
Ruth, Byron E. ( Reviewer )
Brooks, Harold K. ( Reviewer )
Publisher: University of Florida
Place of Publication: Gainesville, Fla.
Publication Date: 1975
Copyright Date: 1975
Subjects / Keywords: Piling (Civil engineering) -- Testing   ( lcsh )
Genre: bibliography   ( marcgt )
non-fiction   ( marcgt )
Abstract: A study to determine the applicability of quasi-static friction cone penetrometer data for predicting the load capacity of displacement piles is presented. The study included performing and evaluating 108 load tests on large-scale model piles, from which load capacity prediction equations were developed. Data from load tests on 15 full-scale piles were used to verify the equations developed from the model pile tests. Three types of model piles were used in the study: a 4.0 in square precast concrete pile; a 4.0 in diameter pipe pile; and a step-taper pile with section diameters ranging from 2.9 to 4.5 in. All piles were driven and tested under field conditions to simulate an actual pile situation, and each pile was instrumented to permit separation of total load capacity into end bearing and side friction components. Each test site was investigated with a Begemann mechanical friction sleeve penetrometer and a Fugro electrical friction sleeve penetrometer, and tests were conducted in both cohesive and granular soils. The different combinations of soil types, penetrometer types', and pile types investigated permitted development of design equations applicable to a wide variety of situations. The results of this study show that the Begemann procedure for estimating pile end bearing capacity in granular soils provided good agreement with the load test results and is a valid design tool. It is also demonstrated that the Begemann procedure is valid for cohesive soils and electrical penetrometer data. When using mechanical penetrometer data for cohesive soils, it is necessary to correct the penetrometer data for tip mantle friction effects before the data can be used to predict pile end bearing capacity. Equations and design curves are developed and presented to permit estimating pile side friction from penetrometer sleeve friction (fs ) data. The equations provide answers which agree well with measured side friction resistance on the model piles and the total predicted capacity for full-scale piles, obtained by adding predicted end resistance and side friction, agree well with measured total capacity. It is shown thai f s values in yranular soils differ significantly for the mechanical and electrical penetrometers, primarily because of end bearing on the lower beveled portion of the mechanical penetrometer friction sleeve. Separate design curves which account for this difference are presented for each penetrometer type. A conventional undrained shear strength approach is recommended for predicting pile side friction in cohesive soils. For the soils investigated, it is shown that measured f $ values are approximately equal for the two penetrometers used and that fs is approximately equal to the undrained shear strength of the soil, as determined from conventional laboratory tests. Drained friction methods of estimating side friction in cohesive soils are also evaluated, and it is concluded that the drained friction approach will ultimately provide a more accurate and fundamentally more correct solution to the pile friction problem. A method of estimating the shaft resistance of step-taper piles is presented in which the shaft resistance is divided into side friction and step-bearing components. Side friction is estimated using equations for a constant section pile and step bearing is estimated from conebearing resistance at the diameter step levels. Predictions obtained in this manner agreed well with measured shaft resistance. The prediction method for step-taper piles is extended for use with continuously tapered piles and used to estimate the capacity of full-scale timber piles. The agreement between measured and predicted capacity is good. It is concluded that the quasi-static cone penetrometer is a valuable tool for estimating the load capacity of displacement piles.
Statement of Responsibility: by Larry C. Nottingham.
Original Version: Typescript
General Note: Vita
Thesis: Thesis--University of Florida.
Bibliography: Includes bibliographical references (leaves 330-334).
 Record Information
Bibliographic ID: UF00098318
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: alephbibnum - 001035186
oclc - 02617009
notis - AFB7546


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