Ground Improvement for Transportation Infrastructure: Experimental Investigations on Cyclic Behavior of a Group of Granular Columns

Shahu, J. T.; Kumar, Suresh; Bhowmik, Riya

doi:10.1061/ijgnai.gmeng-7880

Cited by 15 publications

(4 citation statements)

References 36 publications

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Section: Direct Shear Testsmentioning

confidence: 99%

Shear Strength and Consolidation Behaviour of Kaolin Clay Reinforced with a Granular Column Backfilled with Crushed Waste Glass

Kazmi,

Serati,

Williams

et al. 2024

Geotech Geol Eng

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Granular columns are commonly used for ground improvement. However, minimal research is presently available on the effect of backfill particle size on the geotechnical performance of granular column-reinforced soil. Geo-environmentally, using crushed waste glass (CWG) as a sustainable replacement for depleting traditional construction sands could offer a cleaner feedstock to backfill granular columns while helping recycle growing stockpiles of waste glass, potentially supporting the circular economy transition and decarbonisation of the construction industry. Given these multi-pronged motivations, this study investigated the shear strength and consolidation behaviour of kaolin reinforced with a CWG granular column. Three different particle size ranges (PSR) of CWG were discretely used to install a granular column in the kaolin bed, including fine (0.50–1.0 mm), medium (1.0–1.7 mm) and coarse (1.7–3.35 mm) particles with median particle sizes of 0.78 mm, 1.42 mm and 2.30 mm, respectively. The geocomposite containing a medium CWG column showed the highest increase in friction angle, increasing from 14.0° for kaolin only specimens to 20.7° for the geocomposites. Similarly, the consolidation behaviour of reinforced kaolin (geocomposites) was typically superior to that of kaolin only specimens. Notably, installing a coarse, medium or fine CWG column decreased the average compression index (Cc) of the geocomposites by almost 17%, 35% or 50%, respectively, compared to that of the kaolin only specimens. Given the promising results of this initial study, some suggestions are provided for future studies on assessing the application of CWG as an alternative backfill and sustainable geomaterial in granular column construction.

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Section: Direct Shear Testsmentioning

confidence: 99%

Shear Strength and Consolidation Behaviour of Kaolin Clay Reinforced with a Granular Column Backfilled with Crushed Waste Glass

Kazmi,

Serati,

Williams

et al. 2024

Geotech Geol Eng

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“…The column length was kept the same as that of the specimen (150 mm) to ensure the granular column remains end-bearing (c r = 1.0). The end-bearing granular columns are typically more effective than the floating ones in enhancing the bearing capacity of soft soils and decreasing the induced settlements under cyclic and monotonic loading (Shahu et al 2023). The area replacement ratio (A r ) used to prepare the geocomposites was 16%, with a column diameter of 68 mm positioned concentrically at the centre of the geocomposite, maintaining a sufficient gap between the column boundary and the shear box to prevent the influence of the boundary effect.…”

Section: Direct Shear Testsmentioning

confidence: 99%

Shear Strength and Consolidation Behaviour of Kaolin Clay Reinforced with a Granular Column Backfilled with Crushed Waste Glass

Kazmi¹,

Serati²,

Williams³

et al. 2023

Preprint

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“…In extremely soft soils that do not provide the columns with enough lateral confinement, stone columns might not be the best choice. In recent years, the encapsulation of the columns with various forms of geosynthetics has become increasingly feasible to enhance the column's lateral strength, thereby also increasing its vertical capability [8][9][10][11][12][13][14][15][16][17][18][19][20]. However, there has been limited use of the horizontal layering of geotextiles as a reinforcing material [14,21,22].…”

Section: Introductionmentioning

confidence: 99%

Vertically and Horizontally Reinforced End-Bearing Stone Column: An Experimental and Numerical Investigation

Srijan,

Gupta

2023

Applied Sciences

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In the present study, experiments were conducted using model testing to explore the load-carrying capability of horizontally and vertically reinforced end-bearing stone columns. Single columns with three different diameters, i.e., 50 mm, 75 mm, and 100 mm, were tested under compressive loading in both unreinforced and reinforced circumstances. This study examined three different variations in horizontal reinforcement. In the first case, the geotextile was evenly distributed at regular intervals along the entire height of the column (L). Secondly, horizontal layering was implemented from the column head to the centre of the column. Lastly, in the third case, horizontal layering was applied from the centre of the column to the base of the column. For vertical reinforcement, four different lengths of reinforcement (Lr) were used, i.e., L, 0.75 L, 0.5 L, and 0.25 L. According to the experimental results, using horizontal as well as vertical layers of reinforcement improved the bearing capacity of the stone columns. In addition, the process of layering as well as vertical encasing served to mitigate the lateral bulging of the columns under examination, as it capitalised on the interlocking and frictional interactions among the stones that comprised the columns. Numerical modelling with a finite element (FE) code, Plaxis 3D, was also performed to validate the experimental results. An exhaustive comparison of all the cases was performed, and the experimental results demonstrated a high level of concurrence with the numerical findings.

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Ground Improvement for Transportation Infrastructure: Experimental Investigations on Cyclic Behavior of a Group of Granular Columns

Cited by 15 publications

References 36 publications

Shear Strength and Consolidation Behaviour of Kaolin Clay Reinforced with a Granular Column Backfilled with Crushed Waste Glass

Shear Strength and Consolidation Behaviour of Kaolin Clay Reinforced with a Granular Column Backfilled with Crushed Waste Glass

Shear Strength and Consolidation Behaviour of Kaolin Clay Reinforced with a Granular Column Backfilled with Crushed Waste Glass

Vertically and Horizontally Reinforced End-Bearing Stone Column: An Experimental and Numerical Investigation

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