Influence of geotextile encasement on the behaviour of stone columns: Laboratory study

Miranda, Marina; Costa, Almudena Da; Castro, José Villaverde; Sagaseta, C.

doi:10.1016/j.geotexmem.2016.08.004

Cited by 56 publications

(16 citation statements)

References 31 publications

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“…The field measurement data on the embankment service performance (i.e., the load distribution discipline, excess pore pressure, settlement and lateral displacement) were investigated. Marinda et al [63] carried out a laboratory test on the influence of the encasement on stone columns. The soil-column stress distribution, soil settlement and pore pressure dissipation were measured.…”

Section: (2) Laboratory and In Situ Testsmentioning

confidence: 99%

Review of research on high-speed railway subgrade settlement in soft soil area

2020

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Construction issues of high-speed rail infrastructures have been increasingly concerned worldwide, of which the subgrade settlement in soft soil area becomes a particularly critical problem. Due to the high compressibility and low permeability of soft soil, the post-construction settlement of the subgrade is extremely difficult to control in these regions, which seriously threatens the operation safety of high-speed trains. In this work, the significant issues of high-speed railway subgrades in soft soil regions are discussed. The theoretical and experimental studies on foundation treatment methods for ballasted and ballastless tracks are reviewed. The settlement evolution and the settlement control effect of different treatment methods are highlighted. Control technologies of subgrade differential settlement are subsequently briefly presented. Settlement calculation algorithms of foundations reinforced by different treatment methods are discussed in detail. The defects of existing prediction methods and the challenges faced in their practical applications are analyzed. Furthermore, the guidance on future improvement in control theories and technologies of subgrade settlement for high-speed railway lines and the corresponding challenges are provided.

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Section: (2) Laboratory and In Situ Testsmentioning

confidence: 99%

Review of research on high-speed railway subgrade settlement in soft soil area

2020

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“…This type of numerical analysis can be regarded only as explorative and for research purposes. The unit cell model or the model of a slice of the unit cell at a specific depth are also used for small-scale laboratory studies (e.g., [ 33 , 34 ]).…”

Section: Unit Cellmentioning

confidence: 99%

Modeling Stone Columns

Castro

2017

Materials

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This paper reviews the main modeling techniques for stone columns, both ordinary stone columns and geosynthetic-encased stone columns. The paper tries to encompass the more recent advances and recommendations in the topic. Regarding the geometrical model, the main options are the “unit cell”, longitudinal gravel trenches in plane strain conditions, cylindrical rings of gravel in axial symmetry conditions, equivalent homogeneous soil with improved properties and three-dimensional models, either a full three-dimensional model or just a three-dimensional row or slice of columns. Some guidelines for obtaining these simplified geometrical models are provided and the particular case of groups of columns under footings is also analyzed. For the latter case, there is a column critical length that is around twice the footing width for non-encased columns in a homogeneous soft soil. In the literature, the column critical length is sometimes given as a function of the column length, which leads to some disparities in its value. Here it is shown that the column critical length mainly depends on the footing dimensions. Some other features related with column modeling are also briefly presented, such as the influence of column installation. Finally, some guidance and recommendations are provided on parameter selection for the study of stone columns.

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“…In such cases, adoption of ESC is preferred, which is found to be providing not only sufficient lateral confinement but also facilitates speediness and economy in the construction, besides leveraging the advantage of bearing structural loads immediately after completing the construction. Several researchers reported the importance of ESC meant for serviceability [5,7,[48][49][50][51] and stability [52][53][54] in soft soils under vertical as well as lateral loading conditions [55][56][57]. A review of comprehensive literature also suggests the use of ESC in any type of soft soil, which needs improvement in terms of both strength and stability.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Railway Embankment Supported with Geosynthetic-Encased Stone Columns in Soft Clays: A Case Study

Deshpande

Kumar

Begum

et al. 2021

Int. J. of Geosynth. and Ground Eng.

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Construction on soft soils is a promising task, as it is necessary for engineers to overcome challenges of excess settlements and possible bearing failure. This paper deals with proposing a suitable ground improvement technique as a remedy for an already failed railway embankment and evaluating the performance of the proposed technique both in short-and long-term periods. Based on the prevailing site conditions (i.e. poor shear strength) and obligatory to complete the work within the stipulated time, it is found that geosynthetic-encased stone column (ESC) is a preferred ground improvement technique. An extensive 2D finite element analysis has been undertaken to examine the improvement in bearing capacity concurrently addressing slope stability problem for different column spacing of 1.5, 2, 2.5, 3, 3.5, and 4 m. Interpretation of results revealed that bearing capacity and stability are critical in the short-term period. The results further demonstrated that ESCs by undergoing lateral deflection and bulging, which are found to predominate in the short-term period, sustained the failure against bearing capacity and stability. The spacing of 3 m when considered bearing capacity alone and 2.5 m corresponding to lateral deflection alone is found optimal. Based on the outcome of the study, it is demonstrated that the proposed ESC is an ideal solution of ground improvement for the present case study of failed railway embankment.

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Influence of geotextile encasement on the behaviour of stone columns: Laboratory study

Cited by 56 publications

References 31 publications

Review of research on high-speed railway subgrade settlement in soft soil area

Review of research on high-speed railway subgrade settlement in soft soil area

Modeling Stone Columns

Analysis of Railway Embankment Supported with Geosynthetic-Encased Stone Columns in Soft Clays: A Case Study

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