Bouatia, Mohammed. (1404). Structural Analysis of Two Flexible Pavements Subjected to Groundwater Table Rising Considering Unsaturated Behaviour of Subgrade Soil. هنرهای کاربردی, 13(4), 190-206. doi: 10.22075/jrce.2025.34801.2146
Mohammed Bouatia. "Structural Analysis of Two Flexible Pavements Subjected to Groundwater Table Rising Considering Unsaturated Behaviour of Subgrade Soil". هنرهای کاربردی, 13, 4, 1404, 190-206. doi: 10.22075/jrce.2025.34801.2146
Bouatia, Mohammed. (1404). 'Structural Analysis of Two Flexible Pavements Subjected to Groundwater Table Rising Considering Unsaturated Behaviour of Subgrade Soil', هنرهای کاربردی, 13(4), pp. 190-206. doi: 10.22075/jrce.2025.34801.2146
Bouatia, Mohammed. Structural Analysis of Two Flexible Pavements Subjected to Groundwater Table Rising Considering Unsaturated Behaviour of Subgrade Soil. هنرهای کاربردی, 1404; 13(4): 190-206. doi: 10.22075/jrce.2025.34801.2146

Structural Analysis of Two Flexible Pavements Subjected to Groundwater Table Rising Considering Unsaturated Behaviour of Subgrade Soil

Journal of Rehabilitation in Civil Engineering
مقاله 34، دوره 13، شماره 4 - شماره پیاپی 40، زمستان 2025، صفحه 190-206    اصل مقاله (1.32 M)
نوع مقاله: Regular Paper
شناسه دیجیتال (DOI): 10.22075/jrce.2025.34801.2146
نویسنده
Mohammed Bouatia* 1، 2
1LGC-ROI, Laboratoire de Génie Civil-Risques et Ouvrages en Interaction, Department of Civil Engineering, University of Batna 2-Mustafa Ben Boulaid, 0578 Batna, Algeria
2LTPiTE, Laboratoire Travaux Publics, ingénierie des Transports Environnement, Ecole Nationale Supérieure des Travaux Publics, 16051 Algiers, Algeria
چکیده
In flexible pavements, the resilient modulus (RM) of the subgrade layer is crucial for ensuring the serviceability of these structures throughout their lifespan. This research presents a 3D numerical analysis of the two most commonly used flexible pavement structures in the Algerian road network, GB/GB and GB/NTG, considering the effect of subgrade RM vulnerability to groundwater table (GWT) fluctuations. The first pavement structure is Gravel-Bitumen/Gravel-Bitumen (GB/GB), and the second is Gravel-Bitumen/Non-Treated-Gravel (GB/NTG), denoting the materials composing the base and subbase layers, respectively. To investigate pavement-subgrade interaction, four GWT levels (120m, 60m, 30m, and 15m) were used to assess the structural performance of the analyzed flexible pavements taking into account the effect of the unsaturated behavior of the subgrade soil subjected to GWT rises from 120m to 15m depth. Based on the conditions outlined in the Algerian Manual for New Pavement Design (AMNPD), the numerical simulations were conducted using the advanced FLAC3D software. The results of computed von Mises stresses and induced deflections indicated that the loss of suction, due to GWT rise, can impose substantial additional loads on pavement structures. Further analysis using Alize-LCPC software revealed that a Groundwater Table rise from 120m to 15m could reduce the service duration by over 11 years for GB/GB and over 14 years for GB/NTG pavement structures. Moreover, regression models were developed to predict deflection and von Mises stresses with reliable accuracy (R² > 0.90). Regardless cost considerations, the study concludes that the GB/NTG pavement structure outperforms the GB/GB pavement structure in terms of durability and performance considering similar scenarios.

تازه های تحقیق
  • Due to loss of suction, GWT rise shorten the Service life of flexible pavement.
  • The GB/NTG pavement structure performs better than GB/GB pavement structure.
  • A decrease in subgrade RM increases deflection magnitudes.
  • Predictive regression models for pavement performance are provided.
کلیدواژه‌ها
Flexible pavement؛ Subgrade؛ Service duration؛ Resilient modulus؛ Unsaturated soil
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