Stability assessment of aging water-retaining earth fill dams
Notice bibliographique
Résumé
Numerous earth fill water-retaining dams in power generating stations that were constructed in the 1950’s are still in active service today. Despite satisfactory performance for over fifty years, an aging earth dam (CBBD2) began to show signs of instability by exhibiting sudden movement in its upstream side. Although remedial measures to increase stability has been put into place, it was imperative to understand what caused the sudden movement. There was a need to develop and calibrate a numerical model based on the observed conditions in CBBD2 using parameters determined from extensive laboratory tests conducted on collected soil samples. The calibrated model was used to evaluate the long-term perform performance of other aging earth fill dams to assess if they still meet current dam safety standards. The calibrated model that represented the expected deformation and stability conditions of CBBD2 included creep deformation analyses using clay strength values between the post peak and residual shear strengths. Results indicated that the reduction of shear strength in fissured overconsolidated clays from a post peak value to the average between post peak and residual shear strengths with creep movement, predominantly occurring at the upstream slope, led to the delayed instability in CBBD2. Stability assessment of the remaining earth dams, considering time-dependent creep deformation and using clay strength values between the post peak and residual shear strengths, indicated that these dams were still stable with factors of safety greater than unity. Particular attention must be given to CBBD4 as the factor of safety was at unity which could be an indication of impending failure. Based on the shear creep test results, a factor of safety higher than 1.3 would be needed to avoid long-term failure due to creep. Only two of the remaining seven earth fill dams passed this criteria, implying that there is a need to closely monitor the other dams with regards to creep deformation to avoid creep rupture in the future. In addition, none of the dams had safety factors greater than 1.5 which meant that these dams are still subject to remedial measures to meet this safety requirement.
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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 | 0,000 | 0,000 |
| 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 | 0,000 |
| 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 ».