Field Investigations on Performance of T-Shaped Deep Mixed Soil Cement Column–Supported Embankments over Soft Ground

Liu, Song Yu; Du, Yan-Jun; Yi, Yaolin; Puppala, Anand J.

doi:10.1061/(asce)gt.1943-5606.0000625

Cited by 152 publications

(34 citation statements)

References 2 publications

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“…In recent years, geosynthetic-encased stone columns and controlled modulus columns have been increasingly used. In addition, new types of columns have been developed, such as hollow concrete columns (Liu et al, 2003), multiple stepped columns (Borel, 2007;Liu, 2007a), X-shape (Liu, 2007b) or Y-shape concrete columns, grouted stone columns (Liu, 2007a) and Tshaped DM columns (Liu et al, 2012). Most of these new columns are concrete columns, which have higher strength and stiffness, but different shapes have been used to reduce the amount of concrete to create more efficient and economic solutions.…”

Section: Types Of Columnsmentioning

confidence: 99%

Recent research and development of ground column technologies

Han

2015

Proceedings of the Institution of Civil Engineers - Ground Impr

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In recent years, ground columns, such as vibro-concrete columns and geosynthetic-reinforced stone columns, have been increasingly used to support superstructures and embankments when they are constructed on soft foundations. Several new column technologies have emerged, including different shapes of concrete columns and composite columns. The column technologies have also been combined with other technologies to create more effective and/or economic solutions. However, the composite columns and the combined technologies have presented complicated geotechnical problems in design and construction. This paper summarises different types of column technologies and their functions, installation and applications, addresses design issues, and reviews recent research and development related to the column technologies to improve soft foundations, including failure modes, load transfer mechanisms, bearing capacity, settlement, consolidation and stability. Recent research has indicated that lateral deformation and yielding of columns should be considered in a unit cell model for the analyses of load transfer, deformation and consolidation. Several theoretical solutions have been proposed for the rate of consolidation of column-reinforced soft foundations. Different failure modes should be evaluated for the stability of column-supported embankments. Limit equilibrium methods based on shear failure overestimate the factors of safety of embankments on rigid or semi-rigid columns in soft soil.

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Section: Types Of Columnsmentioning

confidence: 99%

Recent research and development of ground column technologies

Han

2015

Proceedings of the Institution of Civil Engineers - Ground Impr

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“…Portland cement is commonly utilized as binder in S-S remediation (Liu et al, 2012 andParia andYuetl, 2006). By using cement, heavy metals are converted to stable forms and are entrapped in the solid cementation matrix of the stabilized contaminant soil (Paria and Yuetl, 2006).…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Leaching Behavior of a Stabilized and Solidified Anthracene-Contaminated Soil

2018

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This paper presents an investigation into remediation of an anthracene-contaminated clay soil through experimental tests. Samples were prepared of uncontaminated and contaminated soil-cement with 20 and 30% cement. Unconfined compression tests (UCT) were conducted on the natural soil and soil contaminated with anthracene. In addition, similar tests were carried out on uncontaminated and contaminated soil-cement at different curing times. Leaching tests were also conducted on contaminated soil and

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“…Piled embankments, with or without geosynthetic reinforcement, have been widely used to overcome several issues (e.g., insufficient bearing capacity, local instability, and unacceptable settlement), encountered in the construction of railways and highways over weak soils (e.g., highly compressible soil, alluvial clay, and peat) (Chen et al, 2010;Ling et al, 2010;Briançon and Simon, 2012;Liu et al, 2012;Wang C. et al, 2014). Soil arching plays a very important role in reducing the embankment load shared by the weak soil between piles, which is essentially a stress redistribution phenomenon caused by the pile-subsoil relative displacement (Δs), and has been proven to be a key load-transfer mechanism in embankments.…”

Section: Introductionmentioning

confidence: 99%

Visualization of the formation and features of soil arching within a piled embankment by discrete element method simulation

Zheng

Zhang

Cui

2016

J. Zhejiang Univ. Sci. A

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Piled embankments are widely used in highway and railway engineering due to their economy and efficiency in overcoming several issues encountered in constructing embankments over weak soils. Soil arching, caused by the pile-subsoil relative displacement (Δs), plays an important role in reducing the embankment load falling on weak soil, however, the fundamental characteristics (e.g., formation and features) of soil arching remain poorly understood. In this study, a series of discrete element method (DEM) modellings are performed to study the formation and features of soil arching with the variation of Δs in piled embankments with or without geosynthetic reinforcement. Firstly, calibration for the modelling parameters is carried out by comparing the DEM results with the experimental data obtained from the existing literature. Secondly, the analysis of the macroand micro-behaviours is performed in detail. Finally, a parametric study is conducted in an effort to identify the influences of three key factors on soil arching: the friction coefficient of the embankment fill (f), the embankment height (h), and the pile clear spacing (s−a). Numerical results indicate that Δs is a key factor governing the formation and features of soil arching in embankments. To be specific, soil arching gradually evolves from two inclined shear planes at a small Δs to a hemispherical arch at a relatively large Δs. Then, with a continuous increase in Δs, the soil arching height gradually increases and finally approaches a constant value of 0.8(s−a) (i.e., the maximum soil arching height). For a given case, the higher the soil arching height, the greater the degree of soil arching effect. The parametric study shows that the friction coefficient of the embankment fill has a negligible influence on the formation and features of soil arching. However, embankment height is a key factor governing the formation and features of soil arching. In addition, pile clear spacing has a significant effect on the formation of soil arching, but not on its features.

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Field Investigations on Performance of T-Shaped Deep Mixed Soil Cement Column–Supported Embankments over Soft Ground

Cited by 152 publications

References 2 publications

Recent research and development of ground column technologies

Recent research and development of ground column technologies

Mechanical and Leaching Behavior of a Stabilized and Solidified Anthracene-Contaminated Soil

Visualization of the formation and features of soil arching within a piled embankment by discrete element method simulation

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