Soft soils improvement by granular piles reinforced with horizontal geogrid strips

Hasan, Murtaza; Samadhiya, N. K.

doi:10.1080/19386362.2016.1252139

Cited by 16 publications

(7 citation statements)

References 23 publications

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“…The main priority is saving the cruction cost and time. Ground improvement can be done through various processes like Vibroflotation, Stone column, Wick drains, Compaction, Dewatering, Reinforcement, Admixtures or Grouting [1,5,8,41]. The jet grouting technology has been introduced in the United Kingdom and has evolved over time to meet the need for longer geometries, the convenience of use, economic rationale, and improved mechanical qualities.…”

Section: Introductionmentioning

confidence: 99%

A critical review on jet grouting used in ground improvement techniques

Hasan

Qazi²,

Sharma³

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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The ground improvement by jet grouting has been critically reviewed in the present paper. Using different keywords, the organized study was conducted on Web of Science and Scopus, yielding 579 results. The methodology followed PRISMA 2009 guidelines, which included identifying, screening, and analysing a large number of results. A total of 36 papers are eligible for analysis after the screening process. In this study, we look at various concepts such as the type of grouting, the methods used, the type of soil, and the tests that have been conducted by numerous researchers. These techniques are used to improve subsoil characteristics such as bearing capacity, shear strength, settlement characteristics, and drainage. Jet grouting is a technique for reducing soil permeability while increasing shear strength. Jet grouting is primarily used in recent technologies to construct new metro stations, and tunnels, control water discharge, and improve the quality of deep excavation. This paper provides an overview and concept of recent and traditional major ground improvements using jet grouting, as well as their properties and cost considerations.

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Section: Introductionmentioning

confidence: 99%

A critical review on jet grouting used in ground improvement techniques

Hasan

Qazi²,

Sharma³

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…The deep mixing method was used by Rashid et al [11], and horizontal layers of geogrid in the top portion of the column were adopted by Sharma [12]. In addition, Murtaza and Samadhiya [13] reinforced the stone columns with horizontal geogrid strips. Rao and Bhandari [14] used concrete plugs to prevent lateral bulging of the stone columns.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Encased Stone Columns Supporting Embankments on Sabkha Soil

et al. 2020

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The present research work is concerned with the construction of road embankments on a specific soil called Sabkha in Algeria. This soil is not only soft and very humid during the flooding seasons but also has frequent small areas of very soft soil which we here call Locally Weak Zones (LWZ). LWZ is characterized by low strength and high compressibility. The paper presents the results of two-dimensional axisymmetric numerical analyze that were carried out using PLAXIS 2D 2017, for the modeling of an embankment supported by stone columns on Sabkha soil. The study focuses on the evaluation of the maximum bulging of the stone column and on the settlement of the embankment. It has been demonstrated that Ordinary Stone Columns (OSC) were ineffective due to excessive bulging (221.16 mm) caused by the lack of lateral pressure. On the other hand, the Encased Stone Columns (ESC) showed good behavior, namely a much reduced bulging (42.09 mm) and a reasonable settlement (0.962 m vs. 1.560 m for an OSC) so that it is possible to build safe very high embankments. The numerical analysis also shows that the length of the encasement should just be greater than the depth of the LWZ. Besides, an extensive parametric study was conducted to investigate the effects of the variations of embankment height, stiffness of geosynthetic, the depth of the locally weak zone, area replacement ratio (ARR), and the stone column friction angle, on the performance of the (ESC) - embankment composite in (LWZ). Some important guidelines for selecting the ideal encased stone column (ESC) to support embankments on over locally weak zone were established through this numerical study.

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“…Many researchers have used geosynthetic material as encasement for stone columns to improve soft soils. Murugesan and Rajagopal (2009;, Gniel and Bouazza (2009), Samadhiya et al (2009), and Hasan and Samadhiya (2016) studied the behavior of geosynthetic/geogrid-encased stone columns and found that the stiffness of soft soil can be improved by increasing the encasement length. Malarvizhi and Ilamparuthi (2004) reported that settlement can be reduced by providing the encasement by increasing the stiffness of the stone column.…”

Section: Introductionmentioning

confidence: 99%

“…The bearing capacity of composite soil increases with column length, but the increase is not significant when the length exceeds beyond six times the column diameter (Ali et al, 2011). Samadhiya et al (2009), Murugesan and Rajagopal (2010), Ali et al (2011), and Hasan and Samadhiya (2016) conducted tests on stone columns of different diameters and concluded that the stiffness of the soil increases with a decrease in the diameter of the column. This is because of the higher confining stresses mobilized on smaller diameter columns.…”

Section: Introductionmentioning

confidence: 99%

“…The bearing improvement ratio also increased with the thickness of the cap, up to 0.4 times the footing diameter. Samadhiya et al (2009) and Hasan and Samadhiya (2016) studied the lateral reinforcement of geogrid strips by varying the vertical spacing and concluded that the load intensity was increased by decreasing the spacing. The strength of granular pile was increased by increasing the length of reinforcement to a depth of three times the diameter and no further increment was observed.…”

Section: Introductionmentioning

confidence: 99%

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Performance of Encased Silica-Manganese Slag Stone Columns in Soft Marine Clay

Prasad¹,

P.V.V²

2019

IJTech

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Stone columns are the most suitable and economical ground improvement technique for soft soils. Stone columns accelerate the consolidation process, thereby increase the stiffness of the soil. This increase may not be sufficient because of the less lateral confinement, which leads to excessive bulging. The strength of the composite soil can also be increased further by encasing the column with geotextile. In this paper, model tests were conducted on end-bearing stone columns with geotextile encasement and compared with the unreinforced (plain) stone columns. The stone columns were prepared by placing the silica-manganese slag, sand and were reinforced with geotextile with different encasement lengths of D, 2D, 3D, and 4D (D is the stone column diameter; i.e., 5 cm). The tests demonstrated that the engineering behavior of the soil was improved by introducing the silica-manganese slag (when compared with conventional stone columns) and also with encasement. Bulging can also be reduced by providing encasement beyond the zone of bulging.

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Soft soils improvement by granular piles reinforced with horizontal geogrid strips

Cited by 16 publications

References 23 publications

A critical review on jet grouting used in ground improvement techniques

A critical review on jet grouting used in ground improvement techniques

Numerical Modeling of Encased Stone Columns Supporting Embankments on Sabkha Soil

Performance of Encased Silica-Manganese Slag Stone Columns in Soft Marine Clay

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