Laboratory model studies on unreinforced and geogrid-reinforced sand bed over stone column-improved soft clay

Deb, Kousik; Samadhiya, N. K.; Namdeo, Jagtap Babasaheb

doi:10.1016/j.geotexmem.2010.06.004

Cited by 109 publications

(29 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The beneficial effects of stone columns on their loadsettlement characteristics of reinforcing soft clay deposits have been widely demonstrated by several researchers (Engelhardt et al, 1974;DiMaggio, 1978;Han and Ye, 2001;McKelvey et al, 2004;Castro and Karstunen, 2010;Murugesan and Rajagopal, 2010;Cimentada et al, 2011;Deb et al, 2011;Fattah et al, 2011).…”

Section: Introductionmentioning

confidence: 96%

Behavior of Compacted Lime — (Well-graded) Soil columns: Large scale tests and numerical modelling

Malekpoor

Poorebrahim

2014

KSCE J Civ Eng

View full text Add to dashboard Cite

This study presents the results of large scale laboratory model tests to investigate the behavior of Compacted Lime-Well-graded Soil (CL-WS) rigid stone columns in soft soils. Tests were carried out on composite specimens to evaluate the influence of different parameters such as: the diameter of the column, the slenderness ratio, area ratio and the shear strength of the surrounding soil. Finite element analysis has been also performed using PLAXIS software to compare the results of numerical and experimental modelling. In order to assess the real behavior of these columns, some tests have been carried out in the field. Based on the results, it was concluded that CL-WS columns increase the load carrying capacity of soft soils and reduce the settlement. In addition, the results show the influence of model size on the stiffness of the specimens which means that the load carrying capacity decreases by increasing the size of models. However, for specimens containing columns with diameter greater than 100 mm, the variations of stiffness become negligible and hence the results can be used to extrapolate and predict the full size behavior of these columns. A detailed comparison between the experimental and numerical modelling shows a very good agreement.

show abstract

Section: Introductionmentioning

confidence: 96%

Behavior of Compacted Lime — (Well-graded) Soil columns: Large scale tests and numerical modelling

Malekpoor

Poorebrahim

2014

KSCE J Civ Eng

View full text Add to dashboard Cite

show abstract

“…Natural river sand is the most common granular material used for this purpose in India. Studies have also been conducted to evaluate the improvement of bearing capacity for circular footings resting on reinforced sand-soft soil systems (Som and Sahu 1999;Alawaji 2001;Dash et al 2003;Deb et al 2011;Demir et al 2013). Many experimental studies have also been conducted to determine the bearing capacity of strip footings resting on sand layers of limited thickness over soft soil (weak clay) containing geosynthetic reinforcement (geotextiles or geogrid) at the interface (Gourc et al 1982;Das 1989;Dembicki and Alenowicz 1990;Alenowicz and Dembicki 1991;Khing et al 1994;Lee et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Effects of aspect ratio of footings on bearing capacity for geogrid-reinforced sand over soft soil

Roy

Deb

2017

Geosynthetics International

View full text Add to dashboard Cite

Model plate load tests of rigid rectangular footings of different aspect ratios resting on sand overlying soft soil with or without a layer of geogrid at the interface are presented. The width (B) and length (L) of the footings are chosen so that the L/B ratio (aspect ratio) is varied as 1.0, 1.5, and 2.0. The study aims to investigate the effects of the aspect ratio of the rectangular footings and the thickness of the sand layer on bearing capacity, settlement characteristics, load-spread angle, and sizes of geogrid layer (at optimum sand thickness). The strain distribution along the reinforcement is also studied. Based on the test results, an analytical method is proposed to calculate the load carrying capacity of rectangular footings resting on reinforced or unreinforced sand over soft soil. It is found that the optimum sand thickness to footing width ratio is not dependent on the aspect ratio of the rectangular footings. However, the optimum sizes of geogrid reinforcement increase with an increase in aspect ratio of the footings. Also, the load-spread angle increases with an increase in aspect ratio. It is also observed that the load-spread angle in the lengthways direction of a footing is smaller than that in the widthways direction, and it is more pronounced in the case of reinforced soil compared to unreinforced soil.

show abstract

“…Stone column composite foundation (as shown in Figure 1), one of the most commonly used soil improvement technique, has been utilized worldwide to increase the bearing capacity of soft soils and reduce the settlement of superstructures constructed on them. Several researches have been carried out to study the behaviour of stone column-reinforced ground in recent years [2][3][4][5][6][7][8][9][10][11][12]. In these studies, stone columns are typically used in soft soils, as these cannot be compacted.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics of Saturated Silty Soil Ground Treated by Stone Column Composite Foundation

Zhan

Jiang

Yao

2014

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

A shaking table model test was carried out to develop an understanding of the performance improvement of saturated silty soil ground using stone column composite foundation as reinforcement. It is found that at less than 0.161 g loading acceleration, soil between piles has not yet been liquefied, the response acceleration scarcely enlarges, and the shear displacement almost does not appear in silty soil. At 0.252 g loading acceleration, as a result of liquefaction of soil between piles, the response acceleration increases rapidly and reaches its peak, and the shear displacement of silty soil increases significantly. At 0.325 g loading acceleration, the integral rigidity of foundation decreases greatly, which reduces its capability of vibration transmission and result in the response acceleration amplification coefficient is less than that at the former loading acceleration, but the shear displacement of silty soil further increases. The stone column composite foundation can greatly reduce both the shear displacement and the settlement of ground compared with untreated foundation. Under the condition of 7-degree seismic fortification, the design meets seismic resistance requirements.

show abstract

Laboratory model studies on unreinforced and geogrid-reinforced sand bed over stone column-improved soft clay

Cited by 109 publications

References 29 publications

Behavior of Compacted Lime — (Well-graded) Soil columns: Large scale tests and numerical modelling

Behavior of Compacted Lime — (Well-graded) Soil columns: Large scale tests and numerical modelling

Effects of aspect ratio of footings on bearing capacity for geogrid-reinforced sand over soft soil

Dynamic Characteristics of Saturated Silty Soil Ground Treated by Stone Column Composite Foundation

Contact Info

Product

Resources

About