Best estimation of Mechanical Properties at the Concrete-to-Rock Interface and at the Discontinuities of Rock Foundations for Gravity Dams
Bibliographic record
Abstract
The determination of the mechanical properties governing the stability of an existing dam is complex, in particular because of the discontinuities present in the foundation and the interface between the dam and the foundation. These properties are the tensile strength, the cohesion and the angle of friction. EDF, IRSTEA, Sherbrooke University, Hydro-Québec, Clermont-Auvergne University and IFSTTAR have initiated research in order to produce data useful for understanding the failure mechanisms and to propose methodologies to assess mechanical properties in an engineering context.\nThe results of the tensile and shear tests on concrete-rock interfaces are published in the present article. The main results can be summarized as follows. The tensile strengths obtained in tests are between 0.2 and 0.5 MPa depending on the rock type whereas a null tensile strength is usually assumed for initial calculations. The cohesion ranges between 1 and 2.5 MPa in large scale tests, as compared to 100 kPa recommended for initial calculations. These results outline the conservatism of default values and the hidden margins generally present in mechanical characteristic estimations. All the test results can be exchanged and shared with the engineers interested in the subject.\nThe article also presents methodologies for determining the characteristics of rock discontinuities in shear and thus the tensile strength characteristics of the concrete-rock interface. Perspectives are proposed such as the characterization of the apparent cohesion of rock discontinuities and the estimation of the geometry of the dam-foundation contact by non-destructive methods. / La détermination des caractéristiques mécaniques régissant la stabilité d'un barrage existant peut s'avérer complexe notamment en ce qui concerne les discontinuités présentes en fondation et à l'interface barrage-fondation. Ces caractéristiques sont la résistance à la traction, la cohésion et l'angle de frottement. Fort de ce constat, EDF, IRSTEA, l'université de Sherbrooke, Hydro-Québec, l'université de Clermont-Auvergne et IFSTTAR ont lancé des travaux de recherche ces dernières années de manière d'une part à créer des données utiles à la compréhension des mécanismes de rupture et d'autre part à proposer des méthodologies d'estimation des caractéristiques mécaniques utilisables directement par l'ingénierie.\nLe présent article donne les principaux résultats des essais de traction et de cisaillement sur des interfaces béton-rocher. Ces résultats mettent en évidence une résistance à la traction comprise entre 0,2 et 0,5 MPa en fonction du type de rocher alors qu'une résistance à la traction nulle est généralement prise en compte pour le calcul en première approche. Les cohésions obtenues sur des essais à grande échelle sont comprises entre 1 et 2,5 MPa à comparer aux 100 kPa pris pour le calcul en première approche. Ces résultats pourraient faire l'objet d'échange et de partage avec les ingénieries intéressées par le sujet.\nL'article présente également des méthodologies de détermination des caractéristiques de discontinuités rocheuses en cisaillement ainsi que des caractéristiques de résistance à la traction de l'interface béton-rocher. Des perspectives sont proposées quant à de futures actions de recherche prometteuses telles que la caractérisation de la cohésion apparente des discontinuités rocheuses et l'estimation de la géométrie du contact barrage-fondation par des méthodes non-destructives.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".