00771074

Component

https://doi.org/10.3141/1663-05

http://scholar.google.com...butr&publication_year=1999

Reliable calculations of pile setup times represent a critical parameter in the design of large-diameter pipe piles that are used to anchor offshore tension leg platforms. Predictions of setup times can be obtained by analyses that simulate the changes in effective stresses and soil properties occurring around a single pile during installation and subsequent equilibration of excess pore pressures. Pile installation is modeled using the framework of the strain path method, assuming that there is no plugging of soil within the pipe pile. Changes in effective stresses and soil properties at all stages of the analysis are described by the MIT-E3 soil model, with input parameters derived from laboratory tests on high-quality samples. After installation, the analyses solve the radial dissipation of excess pore pressures around the pile shaft and setup of effective stresses in the soil by nonlinear finite element methods. Dissipation times are controlled by the pile aspect ratio (ratio of diameter to wall thickness), in situ effective stress, stress history, and hydraulic conductivity of the clay. This paper illustrates the validation of the proposed setup analyses with data from instrumented model piles and pile shaft elements at two well-documented test sites.

This paper appears in Transportation Research Record No. 1663, Pile Setup, Pile Load Tests, and Sheet Piles.

English

p. 33-40

1999

Transportation Research Record

0309070597

Figures (9) ; References (28) ; Tables (2)

Bearing capacity; Clay; Effective stress; Finite element method; Mathematical models; Mathematical prediction; Nonlinear systems; Offshore platforms; Permeability coefficient; Pore pressure; Support piles; Time; Validation

Aspect ratio; Pile setup; Pipe piles

Bridges and other structures; Data and Information Technology; Geotechnology; Highways; I42: Soil Mechanics

TRIS, TRB, ATRI

Oct 1 1999 12:00AM

• CHARACTERIZATION OF PILE CAPACITY WITH TIME IN THE COOPER MARL: STUDY OF APPLICABILITY OF A PAST APPROACH TO PREDICT LONG-TERM PILE CAPACITY
• FINITE ELEMENT-BASED SEEPAGE DESIGN CHARTS FOR SHEET PILES PENETRATING HETEROGENEOUS MEDIA
• MEASURED PILE SETUP DURING LOAD TESTING AND PRODUCTION PILING: I-15 CORRIDOR RECONSTRUCTION PROJECT IN SALT LAKE CITY, UTAH
• MEASURED TIME EFFECTS FOR AXIAL CAPACITY OF DRIVEN PILING
• NORTH CAROLINA DEPARTMENT OF TRANSPORTATION EXPERIENCE WITH PREDESIGN LOAD TESTING
• NUMERICAL PROCEDURE FOR PREDICTING PILE CAPACITY--SETUP/FREEZE
• TENSION PILES IN SAND: A METHOD INCLUDING DEGRADATION OF SHAFT FRICTION DURING PILE DRIVING
• VALUE OF METHODS FOR PREDICTING AXIAL PILE CAPACITY