American Society of Civil Engineers


Instability and Static Liquefaction on Proportional Strain Paths for Sand at Low Stresses


by Laurent Lancelot, (Asst. Prof., Laboratoire de Mecanique de Lille (CNRS UMR8107), Avenue Paul Langevin, 59655 Villeneuve d’Ascq Cedex, France), Isam Shahrour, (Prof., Laboratoire de Mecanique de Lille (CNRS UMR8107), Avenue Paul Langevin, 59655 Villeneuve d’Ascq Cedex, France), and Marwan Al Mahmoud, (Res. Fellow, Laboratoire de Mecanique de Lille (CNRS UMR8107), Avenue Paul Langevin, 59655 Villeneuve d’Ascq Cedex, France)

Journal of Engineering Mechanics, Vol. 130, No. 11, November 2004, pp. 1365-1372, (doi:  http://dx.doi.org/10.1061/(ASCE)0733-9399(2004)130:11(1365))

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Document type: Technical Note
Abstract: The behavior of Hostun RF sand on proportional strain paths at low confining pressures (20 to 100 kPa) is considered in this paper. In such paths, a constant dilation rate is imposed during shear. The usual features of pore pressure increase (contracting material) or decrease (dilating material) are here observed depending upon whether the imposed dilation rate is respectively greater or smaller than the “natural” dilation rate at failure (as measured in a drained test). Particular attention is given to the static liquefaction phenomenon, which is seen to occur for loose as well as dense sand provided the imposed dilation rate is large enough to lead to a continuous pore pressure increase during shear. Instability tests performed at low confining pressures on proportional strain paths show that the instability line is strain path dependent. It does not coincide with the peak deviator stress line in proportional strain paths tests, in general, but does coincide with the line d2W=0 (nil second increment of total work).


ASCE Subject Headings:
Constitutive relations
Laboratory tests
Sand (material)
Soil liquefaction
Strain rates
Triaxial tests