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Structural Performance Assessment of Lateritic Subgrade Under Varying Moisture Conditions
https://orcid.org/http://orcid.org/0000-0002-9188-8409
Pavement inundation disrupts natural drainage, causing its structural damage and potential failure. This study investigates the impact of moisture fluctuations on pavement failure through four distinct approaches. Firstly, the critical strain at the top of the subgrade layer in unsaturated conditions was predicted using non-linear visco-elastic layer analysis. Secondly, structural number (SN) was established to evaluate the pavement strength under unsaturated conditions. Thirdly, the impact of rising groundwater levels on the structural strength of pavement layers was determined using maximum capillary height from soil suction. Finally, characteristic deflection and static moduli of the lateritic subgrade after a rainfall event were determined from field investigations with Benkelman beam deflectometer (BBD). Simulation in KENLAYER showed that the critical compressive vertical strain above subgrade due to different axle loading for bound and unbound granular layers varied with moisture fluctuation. Calculated SN values showed reduced capacity under saturated conditions compared to optimum moisture under the same traffic. BBD test revealed that the static moduli of the subgrade were lower due to increased moisture content, emphasizing the importance of moisture control and effective drainage for the structural integrity of pavements.
Structural Performance Assessment of Lateritic Subgrade Under Varying Moisture Conditions
https://orcid.org/http://orcid.org/0000-0002-9188-8409
Pavement inundation disrupts natural drainage, causing its structural damage and potential failure. This study investigates the impact of moisture fluctuations on pavement failure through four distinct approaches. Firstly, the critical strain at the top of the subgrade layer in unsaturated conditions was predicted using non-linear visco-elastic layer analysis. Secondly, structural number (SN) was established to evaluate the pavement strength under unsaturated conditions. Thirdly, the impact of rising groundwater levels on the structural strength of pavement layers was determined using maximum capillary height from soil suction. Finally, characteristic deflection and static moduli of the lateritic subgrade after a rainfall event were determined from field investigations with Benkelman beam deflectometer (BBD). Simulation in KENLAYER showed that the critical compressive vertical strain above subgrade due to different axle loading for bound and unbound granular layers varied with moisture fluctuation. Calculated SN values showed reduced capacity under saturated conditions compared to optimum moisture under the same traffic. BBD test revealed that the static moduli of the subgrade were lower due to increased moisture content, emphasizing the importance of moisture control and effective drainage for the structural integrity of pavements.
Structural Performance Assessment of Lateritic Subgrade Under Varying Moisture Conditions
https://orcid.org/http://orcid.org/0000-0002-9188-8409
Pavement inundation disrupts natural drainage, causing its structural damage and potential failure. This study investigates the impact of moisture fluctuations on pavement failure through four distinct approaches. Firstly, the critical strain at the top of the subgrade layer in unsaturated conditions was predicted using non-linear visco-elastic layer analysis. Secondly, structural number (SN) was established to evaluate the pavement strength under unsaturated conditions. Thirdly, the impact of rising groundwater levels on the structural strength of pavement layers was determined using maximum capillary height from soil suction. Finally, characteristic deflection and static moduli of the lateritic subgrade after a rainfall event were determined from field investigations with Benkelman beam deflectometer (BBD). Simulation in KENLAYER showed that the critical compressive vertical strain above subgrade due to different axle loading for bound and unbound granular layers varied with moisture fluctuation. Calculated SN values showed reduced capacity under saturated conditions compared to optimum moisture under the same traffic. BBD test revealed that the static moduli of the subgrade were lower due to increased moisture content, emphasizing the importance of moisture control and effective drainage for the structural integrity of pavements.
Structural Performance Assessment of Lateritic Subgrade Under Varying Moisture Conditions
Transp. Infrastruct. Geotech.
Koshy, Soorya Ann (author) / Salini, U. (author) / Ajitha, T. (author) / Praveen, A. (author)
2025-01-01
Article (Journal)
Electronic Resource
English
Structural Performance Assessment of Lateritic Subgrade Under Varying Moisture Conditions
| Springer Verlag | 2025
| Engineering Index Backfile | 1946
Microstructural Studies on Enzyme-Modified Lateritic Subgrade
| Springer Verlag | 2023
| British Library Conference Proceedings | 2000
| NTIS | 1970