Location

Chicago, Illinois

Session Start Date

4-29-2013

Session End Date

5-4-2013

Abstract

The effects of displacement piling are well documented with many cases of movements caused to adjacent structures and detrimental effects on recently installed piles. The author’s experience with dealing with ground displacements of raft piling in deep marine clays in Singapore led to the development of a method for calculating the ground movements to assess the cumulative effects of pile driving. The method is derived from soil mechanics parameters, principle of potential energy, strain energy and work done by the stresses in the soil undergoing a cylindrical cavity expansion process and the stresses in the soil undergoing large strains direct shearing process due to the pile shaft friction. Published case histories of ground displacements have been back-analysed. The calculated movements compared well with these past field tests and laboratory experimental data. In the moderate to far field distances from the pile, the heave to lateral displacements can be expressed as a function of the ratio of lateral forces to soil weight. For near field distances, the calculations show that the heave reaches a maximum, then turns sharply into a downdrag near to the pile shaft. The method is, however, unstable at distances close to the pile shaft.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Seventh Conference

Publisher

Missouri University of Science and Technology

Publication Date

4-29-2013

Document Version

Final Version

Rights

© 2013 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 29th, 12:00 AM May 4th, 12:00 AM

Soil Movements Due to Displacement Pile Driving

Chicago, Illinois

The effects of displacement piling are well documented with many cases of movements caused to adjacent structures and detrimental effects on recently installed piles. The author’s experience with dealing with ground displacements of raft piling in deep marine clays in Singapore led to the development of a method for calculating the ground movements to assess the cumulative effects of pile driving. The method is derived from soil mechanics parameters, principle of potential energy, strain energy and work done by the stresses in the soil undergoing a cylindrical cavity expansion process and the stresses in the soil undergoing large strains direct shearing process due to the pile shaft friction. Published case histories of ground displacements have been back-analysed. The calculated movements compared well with these past field tests and laboratory experimental data. In the moderate to far field distances from the pile, the heave to lateral displacements can be expressed as a function of the ratio of lateral forces to soil weight. For near field distances, the calculations show that the heave reaches a maximum, then turns sharply into a downdrag near to the pile shaft. The method is, however, unstable at distances close to the pile shaft.