Alternative Title
Paper No. 1.50
Location
St. Louis, Missouri
Date
10 Mar 1998, 9:00 am - 12:00 pm
Abstract
In this study, variation with load was analyzed in terms of the settlement/diameter ratio, of deformation modulus Kp of soil at the tip of a precased concrete pile as bored, defined as the slope of a straight line extending from the point of origin of its stress-settlement curve at its tip as determined through a vertical loading test and intersecting with such curve at the point corresponding to the settlement at each load level as applied during such loading test. Data were taken from a series of vertical loading tests conducted on 18 piles. From the study, the deformation modulus Kp was found:
(1) to decrease exponentially with an increase in settlement/diameter ratio Sp/Op,
(2) to range from 200 to 300 kN/m3, when ultimate load was taken for the one at which a given pile settled by 10% of its tip diameter at its tip, independent on its diameter, length, and the type of soil at its tip,
(3) to be from 600 to 2,000 kN/m3 and 300 to 600 kN/m3 at settlement/diameter ratios of 2% and 4% at pile tip respectively, these settlements being deemed as reasonable criteria to determine the ultimate bearing load of a pile by means of a conventional loading test, and
(4) to converge to a certain value with an increase in settlement/diameter ratio Sp/Dp, regardless of the diameter of the pile, and therefore such modulus can be identified through a loading test on a small diameter pile rather than a large diameter pile, resulting in an economy.
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.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Horiuchi, Takahide and Kani, Yukihiko, "Deformation Modulus of Soil at the Tip of a Bored Pile" (1998). International Conference on Case Histories in Geotechnical Engineering. 43.
https://scholarsmine.mst.edu/icchge/4icchge/4icchge-session01/43
Deformation Modulus of Soil at the Tip of a Bored Pile
St. Louis, Missouri
In this study, variation with load was analyzed in terms of the settlement/diameter ratio, of deformation modulus Kp of soil at the tip of a precased concrete pile as bored, defined as the slope of a straight line extending from the point of origin of its stress-settlement curve at its tip as determined through a vertical loading test and intersecting with such curve at the point corresponding to the settlement at each load level as applied during such loading test. Data were taken from a series of vertical loading tests conducted on 18 piles. From the study, the deformation modulus Kp was found:
(1) to decrease exponentially with an increase in settlement/diameter ratio Sp/Op,
(2) to range from 200 to 300 kN/m3, when ultimate load was taken for the one at which a given pile settled by 10% of its tip diameter at its tip, independent on its diameter, length, and the type of soil at its tip,
(3) to be from 600 to 2,000 kN/m3 and 300 to 600 kN/m3 at settlement/diameter ratios of 2% and 4% at pile tip respectively, these settlements being deemed as reasonable criteria to determine the ultimate bearing load of a pile by means of a conventional loading test, and
(4) to converge to a certain value with an increase in settlement/diameter ratio Sp/Dp, regardless of the diameter of the pile, and therefore such modulus can be identified through a loading test on a small diameter pile rather than a large diameter pile, resulting in an economy.
