Structural Behavior of a Pile-Supported Embankment

Published on Jan 1, 2010in Journal of Geotechnical and Geoenvironmental Engineering4.012
· DOI :10.1061/(ASCE)GT.1943-5606.0000180
G. S. Wachman3
Estimated H-index: 3
 (Polytechnic University of Milan), Luigi Biolzi26
Estimated H-index: 26
 (Polytechnic University of Milan), Joseph F. Labuz32
Estimated H-index: 32
Sources
Abstract
The stress field in a pile-supported 3.9-m-high embankment was interpreted through three-dimensional finite-element modeling, and evaluated by field measurements involving strain gauges on the piles and earth pressure cells at the top and bottom of a 0.9-m-thick geogrid-reinforced platform. Analyses of the numerical results and the experimental data suggest that a vaultlike arch developed within the embankment, such that the vertical stress at the top of the platform was concentrated above the piles and virtually no vertical stress was measured between the piles. A similar situation existed within the platform, where an almost stress-free region between the piles was experimentally detected and numerically verified. From a structural point of view, a supporting skeleton was formed from a pile extension through the platform, a type of stress diffusion problem, and an arching effect appeared mainly in the embankment due to the very large stiffness of the piles in comparison to the surrounding media.
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References8
Newest
This paper describes research to develop a simple laboratory calibration method for an earth pressure cell (EPC). An apparatus was designed to permit the application of loading through a soil column to the sensitive face of an EPC. Calibration tests were conducted under a variety of conditions that included loading from both fluid and earth pressure. For a diaphgram cell with a fluid filled annulus and a rigid rim, EPC output was influenced by an arching effect.
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The use of high strength geosynthetics to transfer loading on to piles is now an established and increasingly popular technique for carrying embankments over very soft ground. Many successful case histories, both in this country and abroad, have been reported in the literature over recent years. The precise mechanism by which load is transferred to the geosynthetics, however, remains relatively poorly understood. It is felt that while several design methods currently exist, none yet truly captur...
Jan 1, 2002·Journal of Geotechnical and Geoenvironmental Engineering4.01
#1Jie Han (Widener University)H-Index: 44
#2Mohammed A. Gabr (NCSU: North Carolina State University)H-Index: 19
Geotechnical engineers face several challenges when designing structures over soft soils. These include potential bearing failure, intolerable settlement, large lateral pressures and movement, and global or local instability. Geosynthetic-reinforced and pile- supported earth platforms provide an economic and effective solution for embankments, retaining walls, and storage tanks, etc. con- structed on soft soils; especially when rapid construction and/or strict deformation of the structure are re...
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Jul 1, 2001·Journal of Geotechnical and Geoenvironmental Engineering4.01
#1Jie Han (Tongji University)H-Index: 44
#2Shu-Lin Ye (Tongji University)H-Index: 1
Field observations and numerical studies demonstrated that stone columns could accelerate the rate of consolidation of soft clays. A simplified method for computing the rate of consolidation is presented in this paper by assuming that stone columns; (1) are free draining; (2) have higher drained elastic modulus than soft clay; and (3) are deformed 1D. The formats of the final solutions in vertical and radial flows are similar to those of the Terzaghi 1D solution and the Barron solution for drain...
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There is considerable uncertainty among design engineers about the behaviour of piled embankments, and the applicability of the British Standard BS8006 (1995) for strengthened/reinforced soils. This paper presents a study to understand the behaviour of piled embankments better by comparing existing design methods with results from three-dimensional numerical analyses. Two UK case histories were investigated. The A13 piled embankments had relatively heavy reinforcement, and were built on areas of...
Nov 1, 1994·Journal of Geotechnical Engineering
#1Bak Kong LowH-Index: 30
#2S. K. TangH-Index: 1
Last. V. ChoaH-Index: 1
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Model tests and theoretical analysis were done to investigate the arching in embankments on soft ground supported by piles with cap beams and geotextiles. The cap-beam–and–geotextile combination may alleviate the uneven surface settlements that sometimes occur in embankments supported by piles with individual square caps. In the model tests, sand was placed on simulated cap beams and soft ground. The loads on the cap beams and soft ground were recorded and compared with theoretical analysis base...
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#1H. A. JanssenH-Index: 1
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The rigid pile composite foundation is widely used in highway projects in soft soil area as it can effectively increase the bearing capacity and stability of the foundation. While the research on the behavior and failure mode of rigid pile composite foundation under embankment is not enough, instability failure of rigid pile composite foundation often occurs in practical projects. This paper presents a centrifuge model test to investigate the load transfer mechanism, settlement characteristic an...
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Geosynthetic-reinforced pile-supported embankments have been increasingly used worldwide to support earth structures. A significant amount of research has been conducted by many researchers and eng...
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Apr 15, 2020·Geosynthetics International3.66
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Many column-supported embankment (CSE) design methods include geosynthetic reinforcement for vertical load transfer and/or settlement reduction regardless of project conditions. However, geosynthet...
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Dans les ouvrages fondes sur sol renforce par inclusions rigides (IR), le matelas de repartition peut etre renforce par une ou plusieurs nappes horizontales, aptes a resister en traction, pour ameliorer son efficacite et optimiser son epaisseur. Ce renforcement basal du matelas n’a ete considere dans les recommandations du projet national ASIRI (2012) que par analogie avec le cas des remblais sur sol non renforce par inclusions, en depit des differences qu’entraine la proximite des tetes d’inclu...
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In order to reduce the effects of the low strength and high compressibility of soft soil, geosynthetic-reinforced pile foundations (GRPF) are widely applied for the construction of high-speed railways. Though its reinforcement effect is proved acceptable in practices so far, it is unclear whether it will keep this performance as the train speed continues increasing. Since it is impossible to study the problem in field tests, only mathematical and physical models can be used. However, the nonline...
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Abstract Given the limit studies on the behavior of GRPS embankments with different numbers of geosynthetic layers and pile caps in a triangular pattern, this paper conducted a series of three-dimensional (3-D) numerical analyses. The numerical model was verified based on a well-instrumented large-scale test. A 3-D soil arch model was proposed for pile caps in a triangular pattern, in which the crown of the upper boundary was approximately 1.4 times the clear spacing of pile caps. Inclusion of g...
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#2B. R. Jayalekshmi (KREC: National Institute of Technology, Karnataka)H-Index: 5
#3R. Shivashankar (KREC: National Institute of Technology, Karnataka)H-Index: 9
For constructing the roads on soft grounds, basal geogrid-reinforced pile-supported embankments are a suitable solution over other conventional ground improvement techniques like preloading, embankment slope flattening, removing and replacing the soft soil, etc. Many studies are available on these basal geogrid-reinforced piled embankments to understand their behaviour under static loading conditions. But it is necessary to understand the behaviour of these geogrid-reinforced piled embankments u...
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