Time-Dependent Fracturing in Granite Under Uniaxial Compression
Notice bibliographique
Résumé
ABSTRACT: Time-dependent processes in rock govern its long-term behavior; hence, understanding these processes is very important, especially for long-lasting surface and underground structures. A series of laboratory-based uniaxial compression tests coupled with acoustic emission (AE) monitoring was conducted to explore the influence of control mode and loading rate on AE characteristics and the damage processes of granite. The experiments were carried out under axial displacement controlled and load controlled modes at varying displacement and loading rates. The stress-strain behavior, strength, AE characteristics, and failure modes were analyzed. The loading and displacement rate in the two control modes significantly affected the mechanical properties of the rock specimen. Results indicated a decrease in rock strength by 15% when the displacement rate reduced from 1μm/s to 0.05 μm/s, and in load-controlled mode, the strength reduced by 20% as the loading rate decreased from 0.55 kN/s to 0.02 kN/s. With the increase in the loading and displacement rates, a noticeable decrease in the time of failure was observed. Acoustic emission (AE) results showed that initially, the loading rates had minimal effect on the damage source parameters, whereas during crack propagation, their influence became substantial. Explosive or tensile events were obtained as the dominant failure mechanism. Under a high displacement rate, the proportion of the explosive events was higher; as the displacement rate reduced, the proportion of the explosive events reduced, and shear events increased. Load-controlled experiments showed insignificant variation in the proportions of the different fracturing mechanisms by changing the loading rate. Decreasing b-value indicated the evolution of large-magnitude events under high rates of loading. This study offers fundamental insights into how brittle rocks undergo damage evolution under various loading and displacement rates, whether in load-controlled or displacement-controlled conditions. 1. INTRODUCTION Understanding the mechanisms of microcracking in rocks over time is crucial for assessing the long-term stability of various rock engineering structures, including tunnels, mining chambers, rock slopes, and nuclear waste repositories. This understanding is essential for evaluating the long-term stability of rock engineering structures such as tunnels, mining rooms and pillars, rock slopes, and nuclear waste repositories (Diederichs and Kaiser 1999, Nara et al. 2010, Paraskevopoulou et al. 2018, Zhang et al. 2020, and Zhao et al. 2022). Furthermore, time-dependent factors also significantly influence the exploration and utilization of resources such as oil and gas reservoirs and enhanced geothermal systems (EGS), as noted by Demarest (1976) and Cornet (2007).
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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 | 0,001 |
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 ».