Foundation of Constructions on Very Soft Soils with Geotextile Encased Columns - State of the Art

Raithel, Marc; Kirchner, Andreas; Schade, C.; Leusink, E.

doi:10.1061/40783(162)20

Cited by 54 publications

(21 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Khabbazian et al (2010) showed numerically that the geosynthetic encasement significantly reduced the lateral displacement of the stone column. Raithel et al (2005) showed that the improvement factors for geotextile-encased columnreinforced foundations were significantly increased by the tensile stiffness of the geotextile as compared with those for the stone columns without geotextile encasement. Castro and Sagaseta (2011a) modified their elastic-plastic solution for stone columns by considering the encasement of a geosynthetic to estimate the settlement of encased stone column-reinforced foundations.…”

Section: Semi-rigid Columnsmentioning

confidence: 99%

“…Geosynthetic-encased stone columns have drawn great attention from researchers (e.g. Castro and Sagaseta, 2011a;Gniel and Bouazza, 2009;Khabbazian et al, 2010;Raithel and Kempfert, 2000;Raithel et al, 2005;Zhang et al, 2012); few field studies have been reported so far and most of the studies were limited to laboratory model tests and numerical analyses. Therefore, more research and field studies are needed for concrete columns and geosynthetic-encased stone columns.…”

Section: Types Of Columnsmentioning

confidence: 99%

See 1 more Smart Citation

Recent research and development of ground column technologies

Han

2015

Proceedings of the Institution of Civil Engineers - Ground Impr

View full text Add to dashboard Cite

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.

show abstract

Section: Semi-rigid Columnsmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…Hence, the computed settlements are essentially time dependent. Kempfert (2003) and Raithel et al (2005) suggested that the settlement factor j varies in the range of 0.4-20. However, because of a different column to soil stiffness ratio, the average settlement of the reinforced soil at a specified degree of consolidation should be lower compared with that of the untreated soft ground, which essentially implies that j , 1.…”

Section: Parametric Studiesmentioning

confidence: 99%

Numerical Solution of Stone Column–Improved Soft Soil Considering Arching, Clogging, and Smear Effects

Indraratna

Basack

Rujikiatkamjorn

2013

J. Geotech. Geoenviron. Eng.

117

View full text Add to dashboard Cite

Improvement of soft clay deposits by the installation of stone columns is one of the most popular techniques followed worldwide. The stone columns not only act as reinforcingmaterial increasing the overall strength and stiffness of the compressible soft soil, but they also promote consolidation through effective drainage. The analytical and numerical solutions available for ascertaining the response of column-reinforced soil have been developed on the basis of the equal strain hypothesis. For typical surcharge (embankment) loading, the free strain analysis appears to give more realistic results comparable to field data. The paper presents a novel numericalmodel (finite-differencemethod) to analyze the response of stone column-reinforced soft soil under embankment loading, adopting the free strain approach and considering both arching and clogging effects. Apart from predicting the dissipation of excess pore water pressure and the resulting consolidation settlement with time, the load transfer mechanismand the extent of ground improvement are some of the salient features captured by the proposedmodel. The proposedmodel is validated by comparing with existingmodels and field data, which indicate the suitability and accuracy of the solutions. The proposed model is also applied successfully to selected case studies. Abstract: Improvement of soft clay deposits by the installation of stone columns is one of the most popular techniques followed worldwide. The stone columns not only act as reinforcing material increasing the overall strength and stiffness of the compressible soft soil, but they also promote consolidation through effective drainage. The analytical and numerical solutions available for ascertaining the response of column-reinforced soil have been developed on the basis of the equal strain hypothesis. For typical surcharge (embankment) loading, the free strain analysis appears to give more realistic results comparable to field data. The paper presents a novel numerical model (finite-difference method) to analyze the response of stone column-reinforced soft soil under embankment loading, adopting the free strain approach and considering both arching and clogging effects. Apart from predicting the dissipation of excess pore water pressure and the resulting consolidation settlement with time, the load transfer mechanism and the extent of ground improvement are some of the salient features captured by the proposed model. The proposed model is validated by comparing with existing models and field data, which indicate the suitability and accuracy of the solutions. The proposed model is also applied successfully to selected case studies.

show abstract

“…В настоящее время существует значительное количество иссле-дований и публикаций, подтверждающих эффективность применения технологии грунтовых свай в оболочке из геосинтетических материа-лов в качестве метода усиления слабых грунтов [1][2][3][4][5][6][7][8][9][10]. Применение грунтовых свай в оболочке из геосинтетического материала позволяет значительно снизить осадку и повысить несущую способность слабых оснований, уменьшить возникающие в свае при ее нагрузке деформа-ции, а также повысить экономическую эффективность строительства.…”

Section: Introductionunclassified

Engineering proposals on the replacement of concrete pile foundation for geosynthetic encased columns base

Ogarkova¹,

Shenkman²

2015

PNRPU CA Bulletin

View full text Add to dashboard Cite

Пермский национальный исследовательский политехнический университет, Пермь, Россия ТЕХНИЧЕСКИЕ РЕШЕНИЯ ПО ЗАМЕНЕ ЖЕЛЕЗОБЕТОННОГО СВАЙНОГО ФУНДАМЕНТА НА ОСНОВАНИЕ, УЛУЧШЕННОЕ АРМИРОВАННЫМИ ГРУНТОВЫМИ СВАЯМИУсиление слабых грунтов является одной из самых главных проблем современной геотехники. Основания, сложенные слабыми грунтами, подвержены деформациям, поэтому для строительства здесь необходимы предварительная подготовка территории, проведение мероприятий по ее улучше-нию. В обратном случае может возникнуть ряд неблагоприятных последствий, таких как неравномер-ная или чрезмерная осадка фундамента и в дальнейшем разрушение конструкций. Одним из совре-менных способов улучшения оснований является применение технологии грунтовых свай в оболочке из геосинтетических материалов. Данная технология широко применяется за рубежом, но слабо изу-чена и практически не распространена на территории России. Отчасти это объясняется жесткой и устаревшей нормативной базой страны. Применение данного способа усиления слабых оснований под строительство зданий и сооружений требует дальнейшего тщательного изучения. В данной статье рассматривается возможность применения грунтовых свай в оболочке из геосинтетических материа-лов для усиления слабого основания под существующее производственное здание, расположенное в Пермском крае. Типовое основание здесь представлено водонасыщенными глинистыми грунтами, подстилаемыми породами верхнепермского возраста. В соответствии с требованиями СНиПов произ-веден расчет осадки проектного свайного фундамента, конструирование и расчет осадки фундамента мелкого заложения, с помощью программы PLAXIS 3D выполнен расчет осадки фундамента на осно-вании, усиленном грунтовыми сваями в оболочке из геосинтетических материалов. Представлены результаты технико-экономического сравнения трех вариантов фундаментов и сделан вывод о воз-можности использования технологии грунтовых свай в оболочке из геосинтетических материалов для усиления слабого основания под строительство здания.Ключевые слова: слабые грунты, грунтовые сваи, осадка, геосинтетическая оболочка, произ-водственное здание, фундамент, PLAXIS 3D, технико-экономическое обоснование, расчет, нагрузка.

show abstract

Foundation of Constructions on Very Soft Soils with Geotextile Encased Columns - State of the Art

Cited by 54 publications

References 0 publications

Recent research and development of ground column technologies

Recent research and development of ground column technologies

Numerical Solution of Stone Column–Improved Soft Soil Considering Arching, Clogging, and Smear Effects

Engineering proposals on the replacement of concrete pile foundation for geosynthetic encased columns base

Contact Info

Product

Resources

About