Chengbo Yu, Shaocheng Ji et Qi Li
Article de revue (2016)
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Libre accès au plein texte de ce document Version officielle de l'éditeur Conditions d'utilisation: Creative Commons: Attribution-Pas d'utilisation commerciale-Pas de modification (CC BY-NC-ND) Télécharger (1MB) |
Abstract
The generalized mixture rule (GMR) is used to provide a unified framework for describing Young's (E), shear (G) and bulk (K) moduli, Lame parameter (λ), and P- and S-wave velocities (Vp and Vs) as a function of porosity in various isotropic materials such as metals, ceramics and rocks. The characteristic J values of the GMR for E, G, K and λ of each material are systematically different and display consistent correlations with the Poisson's ratio of the nonporous material (ν0). For the materials dominated by corner-shaped pores, the fixed point at which the effective Poisson's ratio (ν) remains constant is at ν0 = 0.2, and J(G) > J(E) > J(K) > J(λ) and J(G) < J(E) < J(K) < J(λ) for materials with ν0 > 0.2 and ν0 < 0.2, respectively. J(Vs) > J(Vp) and J(Vs) < J(Vp) for the materials with ν0 > 0.2 and ν0 < 0.2, respectively. The effective ν increases, decreases and remains unchanged with increasing porosity for the materials with ν0 < 0.2, ν0 > 0.2 and ν0 = 0.2, respectively. For natural rocks containing thin-disk-shaped pores parallel to mineral cleavages, grain boundaries and foliation, however, the ν fixed point decreases nonlinearly with decreasing pore aspect ratio (α: width/length). With increasing depth or pressure, cracks with smaller α values are progressively closed, making the ν fixed point rise and finally reach to the point at ν0 = 0.2.
Mots clés
Porous rocks ; Seismic velocities ; Elastic moduli ; Poisson's ratio ; Porosity
Sujet(s): | 1400 Génie minier et minéral > 1400 Génie minier et minéral |
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Département: | Département des génies civil, géologique et des mines |
Organismes subventionnaires: | Natural Sciences and Engineering Council of Canada |
URL de PolyPublie: | https://publications.polymtl.ca/3615/ |
Titre de la revue: | Journal of Rock Mechanics and Geotechnical Engineering (vol. 8, no 1) |
Maison d'édition: | Elsevier |
DOI: | 10.1016/j.jrmge.2015.07.004 |
URL officielle: | https://doi.org/10.1016/j.jrmge.2015.07.004 |
Date du dépôt: | 17 janv. 2019 14:23 |
Dernière modification: | 06 avr. 2024 00:58 |
Citer en APA 7: | Yu, C., Ji, S., & Li, Q. (2016). Effects of porosity on seismic velocities, elastic moduli and Poisson's ratios of solid materials and rocks. Journal of Rock Mechanics and Geotechnical Engineering, 8(1), 35-49. https://doi.org/10.1016/j.jrmge.2015.07.004 |
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