Determination of Compacted Subgrade Thickness to Achieve An Effective CBR Based on Subgrade Deflection Using Odemark’s Method
| International Journal of Civil Engineering |
| © 2024 by SSRG - IJCE Journal |
| Volume 11 Issue 1 |
| Year of Publication : 2024 |
| Authors : Manoj Kumar Sahis, Partha Pratim Biswas, Sourav Paul, Arghya Banerjee |
10.14445/23488352/IJCE-V11I1P102
How to Cite?
Manoj Kumar Sahis, Partha Pratim Biswas, Sourav Paul, Arghya Banerjee, "Determination of Compacted Subgrade Thickness to Achieve An Effective CBR Based on Subgrade Deflection Using Odemark’s Method," SSRG International Journal of Civil Engineering, vol. 11, no. 1, pp. 9-17, 2024. Crossref, https://doi.org/10.14445/23488352/IJCE-V11I1P102
Abstract:
Improvement of the natural subgrade often involves reinforcing weak underlying ground by adding a compacted subgrade layer. The resulting combined structure, where the compacted subgrade overlays the natural subgrade, determines its strength through the effective CBR (California Bearing Ratio). This paper estimates the effective CBR of the soil subgrade in a two-layered system by employing Odemark’s theory for transforming layers and Boussinesq’s method to calculate deflection in distinct layers. Assuming a uniform medium with an elastic modulus to represent the two-layered system, such that it yields an equivalent deflection across both subgrade layers, the transformed homogeneous section’s modulus is utilized to estimate the effective CBR. The outcomes obtained using this approach are compared with results from the ELAYER program. The close alignment between the findings from both methods validates the credibility and acceptance of the proposed technique.
Keywords:
Boussinesq’s, Odemark’s, Compacted subgrade, CBR, Subgrade deflection.
References:
[1] Ming Zhang, Junyan Yi, and Decheng Feng, “Reasonable Thickness Design of Expressway Pavement Structures Based on Grey Relation Analysis of Subgrade Soil Improvement,” Science Progress, vol. 103, no. 1, 2020.
[CrossRef] [Google Scholar] [Publisher Link]
[2] Samuel Y.O. Amakye et al., “Road Pavement Thickness and Construction Depth Optimization Using Treated and Untreated Artificially-Synthesized Expansive Road Subgrade Materials with Varying Plasticity Index,” Materials, vol. 15, no. 8, pp. 1-27, 2022.
[CrossRef] [Google Scholar] [Publisher Link]
[3] Muhammed Alzaim, Abdulgazi Gedik, and Abdullah Hilmi Lav, “Effect of Modulus of Bituminous Layers and Utilization of Capping Layer on Weak Pavement Subgrades,” Civil Engineering Journal, vol. 6, no. 7, pp. 1286-1299, 2020.
[CrossRef] [Google Scholar] [Publisher Link]
[4] Sudhashru Mishra, S.N. Sachdeva, and Rakesh Manocha, “Subgrade Soil Stabilization Using Stone Dust and Coarse Aggregate,” International Journal of Geosynthetics and Ground Engineering, vol. 5, 2019.
[CrossRef] [Google Scholar] [Publisher Link]
[5] John Mukabi, “Mechanistic Approach for Determining Structural Subgrade Thickness,” Electronic Pre-Print: Academia.edu/ResearchGate, pp. 1-5, 2016.
[Google Scholar]
[6] John N. Mukabi, “Quantitative Delineation of the Structural Role of the Subgrade Stiffness and Thickness in Pavements,” Electronic Pre-Print: dr. eng. mukabi@ academia. edu website, pp. 1-10, 2015.
[Google Scholar]
[7] Reza Ziaie Moayed, Farzad Allahyari, and Moeen Nazari, “Effect of Sand Layer Thickness on the CBR Value of Two-Layered Subgrade,” 3rd International Conference on New Developments in Soil Mechanics and Geotechnical Engineering, Nicosia, North Cyprus, pp. 437-444, 2012.
[Google Scholar]
[8] Nataatmadja A., Tao S.Y., and Chim K., “Design Subgrade CBR for Flexible Pavements: Comparison of Predictive Methods,” 25th ARRB Conference, Australia, 2012.
[Google Scholar] [Publisher Link]
[9] M. Amaranatha Reddy, K. Sudhakar Reddy, and B.B. Pandey, “Design CBR of Subgrade for Flexible Pavements,” Highway Research Bulletin, vol. 2001, pp. 61-69, 2001.
[Google Scholar]
[10] Joseph Boussinesq, Application of Potentials to the Study of Equilibrium, and the Movement of Elastic Solids with Extensive Notes on Various Points of Mathematical Physics and Analysis, Gauthier-Villars, 1885.
[Google Scholar] [Publisher Link]
[11] Burmister D.M. et al., “The Theory of Stresses and Displacements in Layered Systems and Applications to the Design of Airport Runways,” Proceedings of the 23rd Annual Meeting of the Highway Research Board, vol. 23, pp. 126-148, 1943.
[Google Scholar] [Publisher Link]
[12] Odemark N., “Investigations as to the Elastic Properties of Soils and Design of Pavements According to the Theory of Elasticity,” No. Meddelande77, Sweden, 1949.
[Google Scholar] [Publisher Link]
[13] D.M. Burmister, “The General Theory of Stresses and Displacements in the Layered System,” Journal of Applied Physics, vol. 16, pp. 89-94, 1945. [CrossRef] [Publisher Link]
[14] Sherif M. El-Badawy, and Mostafa A. Kamel, “Assessment of Improvement of the Accuracy of the Odemark Transformation Method,” International Journal of Advanced Engineering Sciences and Technologies, vol. 6, no. 1, pp. 105-110, 2011.
[Google Scholar]
[15] Yang Hsien Huang, Pavement Analysis and Design, Upper Saddle River, Pearson Prentice Hall, USA, 2004.
[Google Scholar]
[16] IRC: 37-2012, Tentative Guidelines for the Design of Flexible Pavements, Indian Road Congress, 2012. [Online]. Available: https://law.resource.org/pub/in/bis/irc/irc.gov.in.037.2012.pdf
[17] K. Sudhakar Reddy, “Analytical Evaluation of Bituminous Pavements,” Thesis, IIT, Kharagpur, 1993.
[Google Scholar]
[18] Bambang S. Subagio et al., “Multi-Layer Pavement Structural Analysis Using Method of Equivalent Thickness, Case Study: Jakarta-Cikampek Toll Road,” Journal of the Eastern Asia Society for Transportation Studies, vol. 6, pp. 55-65, 2005.
[CrossRef] [Google Scholar] [Publisher Link]
[19] Ullidtz P., “Modeling Flexible Pavement Response and Performance,” ARRB, 1998.
[Google Scholar] [Publisher Link]
[20] Paola Dalla Valle, and Nick Thom, “Improvement to the Method of Equivalent Thicknesses (MET) for Calculation of Critical Strains for Flexible Pavements,” International Journal of Pavement Engineering, vol. 19, no. 12, pp. 1053-1060, 2018.
[CrossRef] [Google Scholar] [Publisher Link]
[21] IRC: 37-2018, Guidelines for the Design of Flexible Pavement, Indian Road Congress, 2018. [Online]. Available: https://law.resource.org/pub/in/bis/irc/irc.gov.in.037.2019.pdf