Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

Abstract

This paper describes the results of field load tests on concrete tapered and straight-sided piles driven into a cohesive saturated ground. The piles were driven into a depth of 12 m at a close distance using diesel hammer machine. The soil profile consisted mainly of soft CL and ML in the Unified Soil Classification System. Two piles were tested initially after 35 days from the installation date using maintained load test procedure according to ASTM D1143-81. Then similar tests were performed on two piles after 289 days following the installation date. The results showed the capacities of both piles were roughly identical after 35 days from the installation time. The load-settlement behaviour of tapered showed stiffer than that of the straight-sided pile. After 289 days from the installation date, both piles offered greater bearing capacity values. The long term bearing capacity of a tapered pile was about 80% greater than that of a uniform pile of the same volume and length. In long term, for a given load level applied to the pile heads, the tapered pile offered greater stiffness than the straight-sided pile. This indicates the advantageous use of tapered piles instead of straight sided piles of the same volume and length.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Sixth Conference

Publisher

Missouri University of Science and Technology

Publication Date

8-11-2008

Document Version

Final Version

Rights

© 2008 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Time-Dependent Bearing Capacity Increase of Uniformly Driven Tapered Piles- Field Load Test

Arlington, Virginia

This paper describes the results of field load tests on concrete tapered and straight-sided piles driven into a cohesive saturated ground. The piles were driven into a depth of 12 m at a close distance using diesel hammer machine. The soil profile consisted mainly of soft CL and ML in the Unified Soil Classification System. Two piles were tested initially after 35 days from the installation date using maintained load test procedure according to ASTM D1143-81. Then similar tests were performed on two piles after 289 days following the installation date. The results showed the capacities of both piles were roughly identical after 35 days from the installation time. The load-settlement behaviour of tapered showed stiffer than that of the straight-sided pile. After 289 days from the installation date, both piles offered greater bearing capacity values. The long term bearing capacity of a tapered pile was about 80% greater than that of a uniform pile of the same volume and length. In long term, for a given load level applied to the pile heads, the tapered pile offered greater stiffness than the straight-sided pile. This indicates the advantageous use of tapered piles instead of straight sided piles of the same volume and length.