Stresses induced in a buried corrugated metal arch culvert due to backfilling compaction efforts
Notice bibliographique
Résumé
• Compaction forces increased the soil stresses as expected. • The maximum compaction impact is in the backfill layer that is directly under compaction. • Culvert deformation peaking occurs when the backfill height is at crown level. • Maximum culvert internal forces are developed when the backfill height is at crown level. • The developed 3D models were able to mimic the monitored culvert performance. The use of flexible buried corrugated metal culverts (CMCs) for traffic and watercourses has recently expanded as a promising technique for shallow underground tunnelling. However, in the design of such structures it is challenging to mimic the performance of the mobilized soil-structure interaction. The backfilling process, with the use of compaction forces, can be considered the major loading mode that develops the predominant deformations and internal forces in the culvert body. Therefore, a thorough understanding of the backfilling process and its effects can contribute to improving CMC design methodology. In this study, a laboratory experiment was used to investigate a flexible buried corrugated metal open-bottom arch culvert, where the compaction impact was monitored during each backfill stage. Following the installation of the culvert in a rigid steel tank, seven sequenced backfill layers were added and compacted, until the target cover depth was reached. Culvert deformations and internal forces were recorded during each backfilling stage. Moreover, the variations in vertical soil stresses developed due to backfilling were measured at two locations: the surface of the bedding soil, and just above the culvert crown. In addition, the lateral perpendicular stresses induced at the exterior circumference of the culvert body near the midpoint of each side backfill layer were measured during backfilling. Finally, a numerical analysis using 3D finite element modelling was performed to simulate the construction sequence of the laboratory test during the backfilling process. The numerical modelling results for the culvert deformations and internal forces were then validated against the recorded measurements obtained in the laboratory experiment and a numerical procedure to simulate the induced backfilling efforts was recommended.
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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,001 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».