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Numerical analysis of lime stabilized capping under embankments based on expansive subgrades
Manoj Anaokar1, Sharad Mhaiskar2
1NMIMS', Mukesh Patel School of Technology Management & Engineering, Department of Civil Engineering, Bhakti Vedant Swami Marg, JVPD Scheme, Vile Parle (West), Mumbai, Maharashtra, 400 056, India.
Heliyon
|November 6, 2019
Summary
This study shows that a
Area of Science:
- Geotechnical Engineering
- Civil Engineering
- Materials Science
Background:
- Expansive clay subgrade soils are prone to swelling, leading to pavement distress.
- Traditional construction methods struggle to mitigate moisture-induced swelling in expansive soils.
- Embankments with flexible pavements require stable subgrade support.
Purpose of the Study:
- To evaluate a novel 'C'-shaped lime-stabilized capping method for confining expansive clay subgrades.
- To assess the capping's effectiveness in controlling moisture ingress and swelling.
- To enhance the performance of flexible pavements built on expansive subgrades.
Main Methods:
- Finite Element Method (FEM) analysis using PLAXIS 3D software.
- Modeling expansive soil behavior with the Mohr-Coulomb material model.
- Simulating soil moisture dynamics using the Van Genuchten Hydraulic Model.
Main Results:
- Significant reduction in swelling displacements of the expansive subgrade soil.
- Observed increase in soil suctions beneath the embankment toe.
- Demonstrated effectiveness of the lime-stabilized capping in moisture control.
Conclusions:
- The 'C'-shaped lime-stabilized capping effectively confines expansive clay subgrades.
- The proposed construction methodology significantly reduces pavement distress caused by soil swelling.
- Lime stabilization offers a viable solution for improving the performance of roads on expansive soils.
Keywords:
Black cotton soilCivil engineeringConstruction engineeringEmbankment for flexible pavementExpansive soil subgradeFinite element analysisGeotechnical engineeringGround improvementLime stabilized cappingSoil engineeringMore Related Videos
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