Evaluation of Swelling Control Parameters for Stabilized Expansive Soil Buffer Layers under Pavement Embankment

Anaokar, Manoj; Mhaiskar, Sharad

doi:10.31873/ijeas.5.1.33

Cited by 6 publications

(7 citation statements)

References 6 publications

(6 reference statements)

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“…The capping material should have an increased modulus for the buffer layer so as to provide a firm levelled surface below the base of the embankment. The UCS tests have been performed on the samples moulded at a density equal to MDD and moisture content equal to OMC+2% as it can be observed from earlier studies [ 14 ] that we get the reduced swelling pressures when the soils are compacted at a moisture content of OMC+2%. The results of UCS in unstabilized and stabilized states (lime content 5 %) for different curing periods are reported in Table 2 .…”

Section: Resultsmentioning

confidence: 99%

“…The results in Table 1 indicate that the soils are highly plastic clay soils having medium to high degree of expansiveness as per IS 1498–1997 [ 13 ]. As the swelling pressure varies depending on the moisture content and it is maximum at OMC and reduces at OMC+2 % [ 14 ], therefore, the magnitudes of swelling pressure at these two moisture contents are reported in Table 1 .…”

Section: Methodsmentioning

confidence: 99%

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Experimental and numerical assessment of efficacy of lime stabilized capping material in controlling swelling displacements within flexible pavement embankments

Anaokar

Mhaiskar

2020

Heliyon

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The performance of flexible pavements constructed on embankments founded on expansive clay subgrade is greatly affected by the distress caused in these embankments as they are subjected to swelling displacements. These are caused by the volume changes in expansive subgrade soil due to moisture variation. The authors have suggested the technique of ‘C’-shaped lime stabilized capping in their earlier studies which is useful for controlling swelling displacements within the expansive subgrade. In the present study, the authors have attempted to assess the efficacy of the capping material itself for controlling swelling displacements at the top and bottom of embankment which is directly responsible for improving the performance of pavements on these embankments. This assessment is carried out with respect to stiffness and reduction in permeability of capping material. Stiffness of the buffer layer controls swelling displacements within the embankment under flexible pavement and the reduced permeability of the capping will control moisture variations and the corresponding pavement distress. The stiffness assessment is carried out through laboratory Unconfined Compression Strength (UCS) tests for modulus estimation by curing the samples for short-term and long-term strength gain. Assessment of permeability reduction is carried through the study of permeability of expansive soils after lime stabilization. Swelling displacements are estimated using Finite Element Analysis (FEA) of the numerical model. The experimental and numerical analysis results indicate that with the increased modulus and reduced permeability of the buffer layer material the swelling displacements at the top and bottom of pavement embankment have reduced. This will help in improving the performance of pavement constructed on the embankment founded on the expansive subgrade.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Experimental and numerical assessment of efficacy of lime stabilized capping material in controlling swelling displacements within flexible pavement embankments

Anaokar

Mhaiskar

2020

Heliyon

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“…It can be observed from the index and swelling properties of soil reported in Table 1 that, all the soils have liquid limit more than 60 % and the plasticity index around or more than 40 %. The authors observed in their earlier studies [10] that, the swelling pressures in unstabilized states reduce at OMC+2 % as compared to their magnitudes at OMC. Therefore, as the soils are to be compacted in the field corresponding to moisture of OMC+2 %, the swelling pressures in case of lime stabilized soil at 5 % lime are evaluated by molding the samples in consolidometer at the moisture content of OMC+2 %.…”

Section: Methodsmentioning

confidence: 92%

“…The Liquid Limit (LL), Plastic Limit (PL), Shrinkage Limit (SL) and Plasticity Index (PI) were found in stabilized and unstabilized states. The swelling properties, namely, Free Swell Index (FSI), Swelling Pressure (SP), and Swelling Strain (SS) in vertical direction obtained in earlier studies carried by the authors [10] for both unstabilized and stabilized states. The optimum percentage of lime as seen from these studies was 5 %.…”

Section: Methodsmentioning

confidence: 99%

“…Many of the researchers have used the Mohr-Coulomb Model, some have used Soft Soil Model [9] and some have used Hardening Soil Model [5, 6] for simulating expansive soils. The main reason for swelling of expansive soils is the moisture ingress and swelling pressure goes on increasing as the moisture approaches Optimum Moisture Content (OMC) of soil at a density of soil equal to Maximum Dry Density (MDD) [10]. Many researchers have tried a variety of solutions including removal and replacement of expansive clay subgrade by Cohesive Non-Swelling (CNS) material [11] for controlling the volume changes occurring due to swell-shrink cycle in these expansive clay subgrade soils.…”

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of lime stabilized capping under embankments based on expansive subgrades

Anaokar

Mhaiskar

2019

Heliyon

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This paper investigates the efficacy of an alternative construction methodology proposed by the authors in the form of a ‘C’-shaped lime stabilized capping. It is used for confining expansive clay subgrade soil under embankments carrying flexible pavement at their top, to enhance their performance. The role of capping in controlling moisture ingress responsible for swelling is assessed by studying vertical displacements and suctions in expansive subgrade soils. The load-displacement behavior and the variations in suctions of expansive subgrade soil are studied by using Mohr-Coulomb material model and Van Genuchten Hydraulic Model respectively in FEM based Software PLAXIS 3D. It is observed from the results that; the swelling displacements are considerably reduced and suctions under embankment toe are observed to increase. It can therefore be concluded that, the lime stabilized capping consisting of horizontal buffer layer and vertical cut-offs is effective in controlling swelling displacements in expansive subgrades.

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Swelling pressures and size effect correlations of expansive soils

Mawlood

Hummadi

2020

Journal of the Chinese Institute of Engineers

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Evaluation of Swelling Control Parameters for Stabilized Expansive Soil Buffer Layers under Pavement Embankment

Cited by 6 publications

References 6 publications

Experimental and numerical assessment of efficacy of lime stabilized capping material in controlling swelling displacements within flexible pavement embankments

Experimental and numerical assessment of efficacy of lime stabilized capping material in controlling swelling displacements within flexible pavement embankments

Numerical analysis of lime stabilized capping under embankments based on expansive subgrades

Swelling pressures and size effect correlations of expansive soils

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