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Collapse of loose sand with the addition of fines : The role of particle shape

J. Yang, Auteur ; L. M. Wei, Auteur |

Dans Géotechnique (Vol. 62 N° 12, Décembre 2012)

This paper describes a fundamental study to explore the role of particle shape in the shear behaviour of mixtures of sand and fine particles (fines) through macro-scale and grain-scale laboratory experiments together with interpretations in the [...]

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Cyclic behaviour and resistance of saturated sand under non-symmetrical loading

J. Yang, Auteur ; H. Y. Sze, Auteur |

Dans Géotechnique (Vol. LXI N° 1, Janvier 2011)

This paper reports findings from an experimental study that aimed to investigate the undrained behaviour of sand in non-symmetrical cyclic loading, and to clarify the role of initial static shear in liquefaction resistance. The testing programme[...]

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Cyclic strength of sand under sustained shear stress

J. Yang, Auteur ; H. Y. Sze, Auteur |

Dans Journal of geotechnical and geoenvironmental engineering (Vol. 137 N° 12, Décembre 2011)

The existence of initial shear stress can have a significant effect on the cyclic strength or liquefaction potential of sand. This effect is not yet fully understood because of a lack of convergence and consistency in the existing data and inter[...]

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Is the quasi-steady state a real behaviour? : a micromechanical perspective

J. Yang, Auteur ; B. B. Dai, Auteur |

Dans Géotechnique (Vol. 61 N° 2, Fevrier 2011)

Whether the so-called quasi-steady state is a real material response is a fundamental yet controversial question in the study of undrained shear behaviour of sand. An attempt is made here to clarify the question from a micromechanical viewpoint [...]

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Relating the maximum radial stress on pile shaft to pile base resistance

J. Yang, Auteur ; F. Mu, Auteur |

Dans Géotechnique (Vol. 61 N° 12, Décembre 2011)

An approximate analytic relationship is developed between the maximum radial stress on the shaft of a displacement pile in sand and the base resistance of the pile. Using the cavity expansion analogy, together with a confined failure mechanism, [...]

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Three-dimensional noncoaxial plasticity modeling of shear band formation in geomaterials

J. G. Qian, Auteur ; J. Yang, Auteur ; M. S. Huang, Auteur |

Dans Journal of engineering mechanics (Vol. 134 N°4, Avril 2008)

Accurate prediction of shear band formation in geomaterials is crucial in the solution of various stability problems in geotechnical engineering. The initiation of shear band is strongly dependent on the constitutive description of the prelocali[...]

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Use of state-dependent strength in estimating end bearing capacity of piles in sand

J. Yang, Auteur ; F. Mu, Auteur |

Dans Journal of geotechnical and geoenvironmental engineering (Vol. 134 N°7, Juillet 2008)

The pressure and density dependence of the shear strength of sand poses a tricky problem in pile foundation design. In this study, a correlation is suggested to link the effective friction angle of sand with its initial confining pressure and re[...]

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Using direct simulation Monte Carlo with improved boundary conditions for heat and mass transfer in microchannels

J. Yang, Auteur ; J. J. Ye, Auteur ; J. Y. Zheng, Auteur |

Dans Journal of heat transfer (Vol. 132 N° 4 (n° spécial), Avril 2010)

Micro-electromechanical systems and nano-electromechanical systems have attracted a great deal of attention in recent years. The flow and heat transfer behaviors of micromachines for separation applications are usually different from that of mac[...]

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