Conference proceeding
Pile settlement predictions using theoretical load transfer curves and seismic CPT data
Geotechnical and Geophysical Site Characterization Vols 1 and 2, pp.1525-1531
01 Jan 2004
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Abstract
Several techniques have been proposed for the prediction of load-settlement behavior of a single pile under axial compression loading. The most widely used technique to study this problem in practice is the load transfer (or T-Z) method. This method models the resistance of the soil as skin friction, using nonlinear springs (T-Z springs) and the pile tip resistance using a non-linear spring (Q(b)-Z spring). Adequate load transfer curves (T-Z and Q(b)-Z curves) are essential in this method to obtain reliable estimates of settlements and load transfer for axially loaded single piles. Such load transfer curves can be empirically obtained or theoretically derived using the low strain initial shear stiffness of the soil surrounding the pile.
This paper presents theoretically derived non-linear load transfer curves that can be used with values of initial shear modulus Go, which can be reliably obtained from in-situ measurements of shear wave velocity from seismic CPT soundings. The asymptotic values needed to define the load transfer curves can also be estimated from the CPT soundings using the LCPC method. The proposed methodology incorporates the soil nonlinearity using a modified hyperbolic model of the type proposed by Fahey and Carter. The use of this modified hyperbolic model was found necessary to incorporate the rapid reduction in secant shear modulus observed when very low strain Go values from seismic CPT measurements are used as initial reference. Pile settlement predictions using this methodology are then compared with available pile load tests. The pile settlement predictions using the proposed theoretical approach and seismic CPT data were found to be in good agreement with the measured behavior of the corresponding static load tests.
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Details
- Title
- Pile settlement predictions using theoretical load transfer curves and seismic CPT data
- Creators
- Miguel A. PandoAmerico L. FernandezGeorge M. Filz
- Contributors
- A VianaDaFonsea (Editor)P W Mayne (Editor)
- Publication Details
- Geotechnical and Geophysical Site Characterization Vols 1 and 2, pp.1525-1531
- Publisher
- Millpress Science Publishers
- Number of pages
- 7
- Resource Type
- Conference proceeding
- Language
- English
- Academic Unit
- Civil, Architectural, and Environmental Engineering
- Identifiers
- 991020575104504721
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- Web of Science research areas
- Engineering, Geological