Direct shear tests on geosynthetic-encased granular columns

Mohapatra, Sunil Ranjan; Rajagopal, K.; Sharma, Jitendra

doi:10.1016/j.geotexmem.2016.01.002

Cited by 79 publications

(14 citation statements)

References 28 publications

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“…This study observed that the kaolin has the lowest direct shear strength. It was also noted that the inclusion of granular column increased the shear strength of the geocomposite, regardless of the type of column backfill, due to the combined soil-granular column system, which has been observed by several researchers before (Mohapatra et al, 2016). For example, reinforcing the kaolin with the CWG column under the applied normal stresses of 12.5, 25, 50 and 100 kPa increased the shear strength from 5.7, 9.9, 15.7 and 33.2 kPa to 8.9, 13.1, 29.9 and 49.3 kPa, respectively.…”

Section: Discussionsupporting

confidence: 58%

“…Typically, geosynthetic materials (geotextiles and geogrids) are suited for use as encasements due to their superior tensile characteristics. Geosynthetic encasement could also improve the lateral load capacity of the granular column by developing hoop tension forces in the encasement layer, giving additional confinement to the column material (Mohapatra et al, 2016). As a result, they minimise the chances for bulging failure and for penetration of column material into the surrounding soil that could inhibit the drainage ability of the column (Dutta et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

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Kaolin Clay Reinforced with a Granular Column Containing Crushed Waste Glass or Traditional Construction Sands

et al. 2022

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Installation of granular columns is a cost-effective and versatile in situ technique to improve the shear strength, settlement, and drainage behaviour of weak soils. It involves backfilling vertical boreholes in the ground with granular materials stiffer than the native soil, such as stone or compacted sand.However, the massive use and overexploitation of sand and natural aggregates have depleted their reserves in recent decades, causing damage to the environment, creating sand shortages and skyrocketing their price. Hence, it is essential to develop a sustainable alternative to natural aggregates to construct granular columns. The ever-increasing stockpiles of waste glass could be a potential replacement for natural sand in several geotechnical construction applications, noting that both materials have a similar chemical composition. Using crushed waste glass (CWG) as an alternative to traditional natural and manufactured (quarried) sands in granular columns could offer a multipronged benefit by recycling non-biodegradable waste (glass) and by conserving a depleting natural resource (sand). Using a large direct shear (LDS) machine, this study investigated the shear strength behaviour of kaolin (to represent a typical weak soil) reinforced with a central granular column. Three different materials were separately used to backfill the column, including natural sand (NS), manufactured sand (MS) and CWG. The results revealed that the geocomposites containing the CWG column have the highest peak friction angle and relatively greater shear strength under high normal stresses, favouring the potential use of CWG as a green alternative to traditional sands in backfilling granular columns, ultimately supporting resource conservation, waste recycling and the paradigm shift towards a circular economy.

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Section: Discussionsupporting

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Kaolin Clay Reinforced with a Granular Column Containing Crushed Waste Glass or Traditional Construction Sands

et al. 2022

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“…In very soft clays where granular piles do not achieve significant load capacity due to poor lateral confinement, geosynthetic encased granular piles are used to increase stiffness and reduce bulging by mobilisation of hoop stress in reinforced material [8][9][10]. In the past, laboratory model tests have been conducted on geotextile as well as geogrid vertical encased end bearing granular piles [10][11][12][13][14][15][16]. The reinforcement in the form of horizontal strips, placed at regular spacing in granular piles enhance the load carrying capacity and control bulging by mobilising frictional resistance between strips and stone aggregates [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Analysis of Geosynthetic-Reinforced Floating Granular Piles in Soft Clays

Hasan

Samadhiya

2016

Int. J. of Geosynth. and Ground Eng.

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The installation of reinforced granular piles is a commonly adopted technique to improve load carrying capacity and reduce settlements in very soft clayey soils. This paper presents results of a series of laboratory model tests and numerical analysis carried on geosynthetic reinforced granular pile under short term loading. Unit cell concept has been adopted. Laboratory model tests were conducted on unreinforced, vertical encased, reinforced with horizontal strips and combined vertical-horizontal reinforced granular piles. The loading was applied either over the entire cylindrical tank area or only over the area of granular piles. The effects of various parameters such as reinforcement, encasement stiffness, shear strength of clay, length and diameter of granular piles have been studied. Experimental results in the form of vertical load intensitysettlement relationship have been compared with that obtained from PLAXIS 3D. The results of laboratory model tests indicated significant influence of reinforcement on the ultimate load intensity of granular piles and ultimate bearing capacity of treated ground. Lateral bulging in reinforced granular piles has also been controlled by incorporating geosynthetic materials.

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“…e results of laboratory models confirmed the obtained numerical results, and both types of analyses showed a reduction in soil mass deformation when using stone columns. In 2014 [8], Castro studied a series of two-dimensional and three-dimensional finite element analyses to evaluate the performance of a group of stone columns under a rigid foundation.…”

Section: Literature and Research Backgroundmentioning

confidence: 99%

Numerical and Larg‐Scale Laboratory Study of Rock Column Groups in Sandy Soil Behavior Improvement

Samangani

Naderi

2022

Advances in Civil Engineering

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The use of stone columns as one of the effective methods in improving soil behavior can increase soil bearing capacity. One of the common methods in improving poor soil is the use of stone columns. Stone columns are considered one of the suitable options to improve the bearing capacity of loose cohesive and granular soils, which, in addition to reducing soil subsidence, is also considered an effective, economical, and environmentally friendly method in structures built on soil. Considering the financial and human losses caused by the construction of various buildings on poor soils, the importance of developing improvement methods in weak and unsuitable soils is essential. On the other hand, sandy soils are always considered an unsuitable soil sample in design. Therefore, in the present study, we use group stone columns to improve the behavior of a sandy soil sample. When a sample of soft sandy soil is exposed to loading due to its sandiness, we see an increase in soil subsidence and thus a decrease in its load-bearing capacity. In order to obtain practical and useable results in practice, in addition to numerical studies, we conduct a laboratory study to investigate the effect of rock columns on improving sandy soil performance. In sandy soil armed with 4 rock columns, the comparison of the results obtained from the numerical and laboratory model to the displacement of 2 mm is completely consistent with each other, and with increasing displacement, we see a difference between the numerical and laboratory results, so that for a 6 mm displacement, we see an 8% difference in numerical and laboratory results. The final sample capacity in the numerical and laboratory study in this case is 6730 N and 6192 N, respectively.

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Direct shear tests on geosynthetic-encased granular columns

Cited by 79 publications

References 28 publications

Kaolin Clay Reinforced with a Granular Column Containing Crushed Waste Glass or Traditional Construction Sands

Kaolin Clay Reinforced with a Granular Column Containing Crushed Waste Glass or Traditional Construction Sands

Experimental and Numerical Analysis of Geosynthetic-Reinforced Floating Granular Piles in Soft Clays

Numerical and Larg‐Scale Laboratory Study of Rock Column Groups in Sandy Soil Behavior Improvement

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