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Undrained monotonic and cyclic shear response and particle crushing of silica sand at low and high pressures.(Report)

Hyodo, Masayuki ; Wu, Yang ; Aramaki, Noritaka ; Nakata, Yukio

Canadian Geotechnical Journal, 2017, Vol.54(2), p.207(12) [Periódico revisado por pares]

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  • Título:
    Undrained monotonic and cyclic shear response and particle crushing of silica sand at low and high pressures.(Report)
  • Autor: Hyodo, Masayuki ; Wu, Yang ; Aramaki, Noritaka ; Nakata, Yukio
  • Assuntos: Silicon Dioxide – Mechanical Properties ; Silicon Dioxide – Analysis ; Phase Transitions (Physics) – Analysis ; Shear (Mechanics) – Analysis ; Stresses (Materials) – Analysis
  • É parte de: Canadian Geotechnical Journal, 2017, Vol.54(2), p.207(12)
  • Descrição: A series of undrained monotonic and cyclic triaxial tests were performed on silica sand at two initial densities and different confining pressures from 0.1 to 5 MPa to investigate their shear response and crushing behaviour. The influence of particle crushing on the undrained shear strength and pore-water pressure was examined. To clarify the evolution of particle crushing, undrained monotonic and cyclic tests were terminated at several distinctive stages and sieving analysis tests were subsequently performed on the tested specimens. In the undrained monotonic test, specimens exhibited remarkable dilation behaviour and experienced no apparent particle crushing at low confining pressures. An increase in the mean stress suppressed the dilatancy due to a faster increase of the pore-water pressure, giving rise to the occurrence of particle crushing. In the undrained cyclic test, a higher confining pressure and cyclic stress ratio resulted in a much higher relative breakage. At a specific cyclic stress ratio, the relative breakage increased as the cyclic loading progressed. The confining pressure and shear strain amplitude played a significant role in controlling the evolution of particle breakage. The correlation between the relative breakage and plastic work for specimens under isotropic consolidation, undrained monotonic, and cyclic loadings has been validated experimentally. Key words: undrained shear behaviour, particle crushing, phase transformation state, cyclic stress ratio, plastic work. Une serie d'essais triaxiaux monotones et cycliques non draines ont ete effectues sur du sable de silice a deux densites initiales et differentes pressions de confinement de 0,1 a 5 MPa, pour etudier leur reponse au cisaillement et leur comportement d'ecrasement. L'influence des particules de broyage sur la resistance au cisaillement et de pression de l'eau interstitielle a ete examinee. Pour clarifier revolution du broyage des particules, des essais monotones et cycliques non draines ont ete executes a plusieurs etapes distinctes et des essais d'analyse de tamisage ont ensuite ete effectues sur les echantillons testes. Dans l'essai monotone non draine, les echantillons presentaient un comportement de dilatation remarquable et n'ont eprouve aucun ecrasement de particule apparent a des pressions de confinement faibles. Une augmentation de la contrainte moyenne a supprime la dilatance due a une augmentation plus rapide de la pression de l'eau interstitielle, ce qui donna lieu a l'apparition de broyage de particules. Dans l'essai cyclique non draine, une pression de confinement et le rapport cyclique de contrainte superieurs ont conduit a un rapport de rupture beaucoup plus eleve. A un rapport specifique de contrainte cyclique, la rupture relative a augmente alors que le chargement cyclique a progresse. La pression de confinement et l'amplitude de cisaillement de deformation ont joue un role important dans le controle de revolution de la rupture des particules. La correlation entre la rupture relative et le travail plastique pour les echantillons sous la consolidation isotrope, les chargements monotones et cycliques non draines avaient ete valides experimentalement. [Traduit par la Redaction] Mots-cles: comportement au cisaillement, particules de broyage, etat de transformation de phase, rapport cyclique de stress, travail plastique.
  • Idioma: Inglês

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