Soil arching analysis in embankments on soft clays reinforced by stone columns

Fattah, Mohammed Y.; Zabar, Bushra S.; Hassan, Hanan A.

doi:10.12989/sem.2015.56.4.507

Cited by 33 publications

(13 citation statements)

References 6 publications

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“…The results indicated that a critical parameter is the ratio of the embankment's heights to the spaces between columns (h/s-d). While there is no apparent effect of arching at (h/s-d) 1.2 and 1.4 for OSC and ESC respectively (h=embankment's height, s=column spacing, d=diameter of stone columns), the settlement at the embankment's surface is significant [8]. The objective of the present study is to find the effect of different shear parameters of soft soils treated by stone columns on different soil profiles of soft soil creep behaviour.…”

Section: Introductionmentioning

confidence: 88%

“…For all the L/d ratios, using a cap above the stone column increases the bearing improvement ratio and reduces the settlement [7]. Fattah et al (2016) studied the performance of a model of embankment supported by soft soil treated by usual stone columns and stone columns encased in geogrid. Soil with an undrained shear strength of 10 kPa, the study of the model was conducted with various spacing and two different L/D ratios of the stone columns, additionally to the different heights of the embankment.…”

Section: Introductionmentioning

confidence: 99%

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The Impact of Using Different Types of Soft Soils Treated by Stone Columns on Creep Behavior

Al-Auqbi

Salim

Mahmood

2022

IOP Conf. Ser.: Earth Environ. Sci.

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The stone column technique is an effective method to increase the strength of soft cohesive soil, which results in a reduction in foundation settlement and an increase in bearing capacity. The topic of restraining creep settlement through the use of stone columns techniques has gained increasing attention and consideration; because stone columns are widely used to treat soft soil deposits, caution should be applied in estimating creep settlement. We discovered a reversible relation between shear parameters and the creep settlement in floating stone columns; while, in case of end-bearing stone columns shows a direct positive relation between shear parameters and the creep settlement, and the creep settlement began at the primary settlement. The shear parameters affected the improvement factor (n) of creep settlement in both floating and end-bearing stone columns. The standard creep coefficient’s n values in floating and end-bearing conditions were more significant than the low creep coefficient’s n values in forwarded geometric conditions. The stress in both floating and end-bearing stone columns was increasing and uniformly distributed along the length of the floating stone column and in the case of end-bearing stone column was limited to the stiffness layer; the maximum vertical stress was in the central point of the embankment. The embankment’s maximum horizontal displacement occurred on the edge.

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Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

The Impact of Using Different Types of Soft Soils Treated by Stone Columns on Creep Behavior

Al-Auqbi

Salim

Mahmood

2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…In the recent decades, many numerical and experimental studies have been carried out to focus on the performance of GESC. Fattah and Majeed [12][13][14][15] investigated the behavior of soft soil ground reinforced with original stone column (OSC) and GESC. e parameters, different spacing distance between stone columns, length to diameter ratio, shear strength of the surrounding soil, and the area replacement ratio, were employed to study their effects on the bearing improvement and settlement reduction.…”

Section: Introductionmentioning

confidence: 99%

Settlement Behavior of Soft Subgrade Reinforced by Geogrid‐Encased Stone Column and Geocell‐Embedded Sand Cushion: A Numerical Analysis

Gao

Qian

et al. 2020

Advances in Civil Engineering

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The geosynthetic-encased vertical column and geosynthetic-embedded horizontal cushion are recognized as the effective methods to reduce the settlement of the soft subgrade. This paper investigated the settlement behavior of a soft subgrade reinforced by geogrid-encased stone column and geocell-embedded sand cushion using the finite element analysis method (Plaxis 2D). The simulating settlement was in good agreement with the field monitoring data, indicating the reasonability of the designed model and adopted parameters. After that, the factors, geocell layer in sand cushion, encasement length around stone column, and standing time between embankment filling stages, were employed to study their influences on the subgrade settlement. The results showed that the embedment of geocell reduced construction settlement, postconstruction settlement, and differential settlement is attributed to the increase in stiffness of sand cushion and therefore the uniform distribution of additional stress on subgrade surface. When the encasement length of stone column increased from 1D (one time the column diameter) to 8D (full encasement), the settlement in construction stage and postconstruction stage decreased by 32.2% and 35.1%, respectively, which is benefited from the increase in the compression modulus of the column. The maximum lateral deformation occurred at the position of about 2D from the top of the stone column, and it decreased more significantly when the encasement length increased from 1D to 4D than that from 4D to 8D. The encasement length up to 4D is found to be adequate in reducing the subgrade settlement and the column lateral deformation based on the consideration of performance and economy. The extension of the filling interval increased the construction settlement caused by soil consolidation, while it decreased the postconstruction settlement.

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“…For example, according to Elias et al (2001), the advantages provided by using geosynthetic materials to reinforce soil structures are noted under these conditions. Besides, the polymeric material can be employed with other solutions to improve lateral support, such as exposed by Fattah et al (2015Fattah et al ( , 2016a. Many deterministic methods have been proposed aiming to determine the key design features of geosyntheticreinforced soil structures (Koerner, 2012;Ariyarathne and Liyanapathirana, 2015;Fonseca and Palmeira, 2018).…”

Section: Introductionmentioning

confidence: 99%

Reliability Analysis of a Controlled Stage-Constructed and Reinforced Embankment on Soft Ground Using 2D and 3D Models

Belo

Silva

2020

Front. Built Environ.

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Geosynthetic reinforcement has become a very practical technique to improve geotechnical structure safety. In spite of improved soil behavior, structures are affected by uncertainties related to soil and reinforcement material properties. This paper aims to present a reliability analysis in order to take statistical information (uncertainties) into account in a safety analysis of reinforced embankments. The analysis was used in a case study on a controlled stage-constructed embankment on soft ground in order to investigate its probabilistic stability. Modeling was performed by commercial geotechnical software usage (GeoStudio and RocScience packs, SIGMA/W + SLOPE/W, and SLIDE 3 , respectively) and the reliability structural analysis was acquired by coupling this software with a reliability program. Then, two numerical models were simulated: a 2D and a 3D one. For this application, the First Order Reliability Method (FORM) was assumed for the reliability analyses. The statistical information, as well as the correlation between variable pairs, was based on a literature review. In total, 29 parameters were assumed as random variables (splitting parameters from different zones and layers). At the same time, the influence of the uncertainty level on reliability analysis and the sensitivity of parameters (assumed as random variables) were investigated. As a result, the reliability indexes obtained showed that the structure analyzed should not be considered with a satisfactory safety level. Meanwhile, the uncertainty level assumed for random variables can lead the probabilistic analysis to very different conclusions about the structural safety, and the most sensitivity parameters observed were the bulk unit weight (clay-soft soiland fill material) and the undrained shear strength, followed by a slight importance of the initial void ratio.

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Soil arching analysis in embankments on soft clays reinforced by stone columns

Cited by 33 publications

References 6 publications

The Impact of Using Different Types of Soft Soils Treated by Stone Columns on Creep Behavior

The Impact of Using Different Types of Soft Soils Treated by Stone Columns on Creep Behavior

Settlement Behavior of Soft Subgrade Reinforced by Geogrid‐Encased Stone Column and Geocell‐Embedded Sand Cushion: A Numerical Analysis

Reliability Analysis of a Controlled Stage-Constructed and Reinforced Embankment on Soft Ground Using 2D and 3D Models

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