American Society of Civil Engineers


Modeling Soil-Pile Interaction under Axial Loading Using a Bilinear Mohr-Coulomb Based Model


by Juan M. Mayoral, (Researcher, Geotechnical Department, Institute of Engineering, Universidad Nacional Autónoma de México, 04510 Mexico City, Mexico E-mail: JMayoralV@iingen.unam.mx), Manuel J. Mendoza, (Researcher, Geotechnical Department, Institute of Engineering, Universidad Nacional Autónoma de México, 04510 Mexico City, Mexico E-mail: mjm@pumas.iingen.unam.mx), Francisco A. Flores, (Graduate student, Geotechnical Department, Institute of Engineering, Universidad Nacional Autónoma de México, 04510 Mexico City, Mexico E-mail: FFloresL@iingen.unam.mx), Miguel P. Romo, (Researcher, Geotechnical Department, Institute of Engineering, Universidad Nacional Autónoma de México, 04510 Mexico City, Mexico E-mail: mromo@pumas.ii.unam.mx), and Enrique Ibarra, (Graduate student, Geotechnical Department, Institute of Engineering, Universidad Nacional Autónoma de México, 04510 Mexico City, Mexico E-mail: eibr@pumas.ii.unam.mx)
Section: Geotechnical Modeling, pp. 204-213, (doi:  http://dx.doi.org/10.1061/41095(365)17)

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Document type: Conference Proceeding Paper
Part of: GeoFlorida 2010: Advances in Analysis, Modeling & Design
Abstract: It is common practice to rely on traditional relationships to compute the bearing capacity of deep foundations. In particular, when dealing with piles is essential to calibrate the load-displacement response, both for axial and lateral loading and to define the load transfer mechanism at the pile tip and along the shaft. These calibrations allow to reduce uncertainties and to design less expensive and safer foundations. The objective of this paper is to simulate the mechanical response obtained from a load test performed in a real scale cast in place concrete pile embedded in alluvial sand, using a 3D finite differences model. The pile was instrumented to monitor directly the reaction along its shaft and tip. The interface was modeled using a shear coupling-spring with frictional resistance. Both the soil and the pile were represented with four nodes axi-symmetric elements. The stress-strain behavior of the soil and soil-pile interface was described with a bilinear Mohr- Coulomb constitutive law. Although the simplicity of the bilinear model, good agreement was observed between the measured and computed responses when monotonic increasing loading was applied (i.e. static conditions). However, the bilinear constitutive model largely underestimates the measured permanent deformations prevailing in the pile-soil system after unloading. This should be accounted for when analyzing the dynamic response of the soil-pile system.


ASCE Subject Headings:
Soil-pile interactions
Axial loads
Deep foundations
Load bearing capacity