When volume fractions are high and distributions are narrow, dilatancy
, and shear-thickening effects are observed [10-18], Particle clusters that block the flow are formed, leading to instabilities.
During compression in different confining pressure and tension in different strain rate and different temperature, the volume strain is always characterizes negative and positive dilatancy
shown in Fig.
However, with the associated flow rule, the pressure-sensitive yield functions usually lead to the plastic dilatancy
which is at least an order of magnitude larger than that observed in experiments.
and fracture-induced velocity changes in rock and their relation to frictional sliding.
Nour, "Significance of soil dilatancy
in slope stability analysis," Journal of Geotechnical and Geoenvironmental Engineering, vol.
11] indicated that the side friction on a pile would show strain hardening because of the phenomenon of shear dilatancy
under a large number of cycles.
It was found that high reactivity aggregates pronounced by high mortar bar dilatancy
result in significant decrease of P-wave velocity and high ultrasonic signal attenuation.
creep with hardening and failure, dilatancy
, plastic deformation and cracking, coupled with thermal and hydraulic processes incl.
Therefore some researchers use an intangible parameters as for example the effective friction coefficient without dilatancy
between jointed surfaces (Gerrard, 1986).
It means that the dilatancy
is zero in the peak of undrained effective stress path.
This decrease occurs because of the role of the fines in reducing the soil dilatancy
and amplifying the phase of contraction in the sand-silt mixtures, which leads to a reduction in the confining effective pressure and, consequently, a decrease in the peak strength of the mixtures.
Table 1: Specification of Material Properties Permeability Dilatancy
Cohesion Friction Poisson (m/day) ([degrees]) (Kpa) angel Ratio ([degrees]) 0.