TH 241 Column-Supported Embankment

Published on Jun 1, 2008
G. S. Wachman3
Estimated H-index: 3
,
Joseph F. Labuz32
Estimated H-index: 32
Sources
Abstract
A pile-supported embankment constructed on TH 241 near St. Michael, Minnesota was instrumented with 48 sensors, including strain gages on the piles and on the geogrid, as well as earth pressure cells and settlement systems near the base of the embankment. Pile-supported embankments are relatively novel structures employed largely at bridge approaches and highway expansions where soft soils would otherwise lead to unacceptably large differential settlements. The structure typically consists of a number of capped piles, well-compacted gravel, and one or more layers of geogrid reinforcement above the piles. Analyses of the data suggest that the redistribution of the embankment load to the piles occurs within and above the so-called load transfer platform, a 1 m layer of geogrid-reinforced gravel. Arching seemed to take place within the embankment, such that the stress at the top of the platform was concentrated above the piles.
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2005
3 Authors (Won-Pyo Hong, ..., Kwang-Wu Lee)
References9
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#1Zhanping YouH-Index: 60
#2Ala R. AbbasH-Index: 16
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#2Yong ShaoH-Index: 1
Settlement is one of the major concerns in roadway embankment construction in areas where soft soil deposits constitute the major portion of subsurface soil. A pile foundation system is an effective way to support an embankment in order to minimize total settlement. In recent years, geosynthetic reinforcement has been successfully incorporated with pile foundations to improve settlement performance. Referred to as Load Transfer Platform (LTP), or Geosynthetic Reinforced Platform (GRP), the syste...
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#1Miriam E. StewartH-Index: 2
#2George M. FilzH-Index: 20
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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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#1Cyril PlomteuxH-Index: 1
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A wide range of deep foundation systems has recently been developed for construction of embankments on soft soils. Controlled Modulus Columns (CMC) is one technique of ground modification, originally developed in France, for support of light structures such as highway and railway embankments. This paper presents the case history of a column supported embankment project in which 2193 CMC columns were installed up to a depth of 12.5 m to minimize settlement of an embankment. Main challenges were s...
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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...
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...
#1Bak Kong LowH-Index: 30
#2S. K. TangH-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鈥揳nd鈥揼eotextile 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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Cited By5
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#1Daniel King (Monash University)H-Index: 3
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Abstract In recent years, geosynthetic reinforced column supported embankments (GRCSEs) have become an increasingly popular design solution for road and rail infrastructure constructed over soft soil sites. However, the serviceability behaviour and deformation that often govern the suitability of their design is not well understood. This is due, in part, to the difficulties in describing the arching stress development in the load transfer platform (LTP). This paper highlights the need for couple...
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#1Liu Kaiwen (Southwest Jiaotong University)H-Index: 11
#2R. Kerry Rowe (Queen's University)H-Index: 58
Abstract The influence of reinforcement viscosity on the post-construction performance of embankments with floating columns and fully penetrating columns is explored. It is shown that the viscous behaviour of geosynthetic reinforcement can increase the long-term shear deformations of foundation soil and increase the horizontal toe movement. The effects of reinforcement strain at the end of construction of embankments over two soft clay deposits are investigated. The deep-mixing-method column sup...
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#1Liu Kaiwen (Southwest Jiaotong University)H-Index: 11
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Abstract The short-term and long-term performance of reinforced, deep mixing method (DMM) floating-column supported embankments with and without prefabricated vertical drains (PVDs) are investigated using a fully 3D coupled model. The concurrent use of PVDs with the other two forms of soft ground improvement significantly shortens time for subsoil consolidation and also substantially reduces post-consolidation lateral displacements and post-construction crest settlements. The combined use of PVD...
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#1R. Kerry Rowe (Queen's University)H-Index: 58
#2Liu Kaiwen (Queen's University)H-Index: 11
The performance of four sections of a full-scale embankment constructed on soft soil is examined using a fully coupled and fully three-dimensional finite element analysis. The four sections had sim...
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#1R. Kerry Rowe (Queen's University)H-Index: 58
#2Liu Kaiwen (Queen's University)H-Index: 11
Last. C. TaechakumthornH-Index: 3
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Geosynthetic reinforcement and prefabricated vertical drains (PVDs), both separately and in combination, have substantially improved the engineer鈥檚 ability to cost-effectively construct embankments and fills over difficult and soft soils. This chapter explores the reason for the success and the benefits that can be achieved using geosynthetics as a basal reinforcement, and PVDs to increase short-term stability of embankments and to accelerate consolidation and long-term strength gain. Also, the ...
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