Alternative Title

Paper No. 1.55

Location

St. Louis, Missouri

Date

10 Mar 1998, 9:00 am - 12:00 pm

Abstract

A method to predict lateral load-deflection relationships for single free-headed piles in clay, considering the non-linear modulus of the sub grade reaction is proposed on the basis of the analysis of full-scale test data on ten piles. The modulus of the horizontal subgrade reaction, kh, was obtained from the field load-deflection data of six piles in soft clay and four piles in stiff clay. The kh values depend on lateral (shear) strain, which is related to pile diameter and deflection. Empirical equations of normalized modulus degradation with shear strain have been proposed for both soft and stiff clays. The maximum value of the modulus of horizontal subgrade reaction, khmax, has been related with the undrained shear strength of clays. A comparison of the results from the present method and the p-y method with the measured load-deflection curves has also been made. The proposed method predicts upper and lower bound load-deflection curves which are valuable guides to making informed decisions.

Department(s)

Civil, Architectural and Environmental Engineering

Meeting Name

4th Conference of the International Conference on Case Histories in Geotechnical Engineering

Publisher

University of Missouri--Rolla

Document Version

Final Version

Rights

© 1998 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Mar 8th, 12:00 AM Mar 15th, 12:00 AM

Non-linear Lateral Pile Deflection Predictions in Clays

St. Louis, Missouri

A method to predict lateral load-deflection relationships for single free-headed piles in clay, considering the non-linear modulus of the sub grade reaction is proposed on the basis of the analysis of full-scale test data on ten piles. The modulus of the horizontal subgrade reaction, kh, was obtained from the field load-deflection data of six piles in soft clay and four piles in stiff clay. The kh values depend on lateral (shear) strain, which is related to pile diameter and deflection. Empirical equations of normalized modulus degradation with shear strain have been proposed for both soft and stiff clays. The maximum value of the modulus of horizontal subgrade reaction, khmax, has been related with the undrained shear strength of clays. A comparison of the results from the present method and the p-y method with the measured load-deflection curves has also been made. The proposed method predicts upper and lower bound load-deflection curves which are valuable guides to making informed decisions.