As the loading progressed, the particles in the middle of the model moved outward due to pressure, resulting in the dilatancy
of specimens in the middle of the model, which was the same as the failure mode (Figure 10) of samples in the indoor test.
Byerlee, "The effect of microcrack dilatancy
on the permeability of Westerly granite," Journal of Geophysical Research, vol.
Yuan and Harrison  proposed the local degradation method, in which the hydromechanical coupling with evolutions of element's permeability and dilatancy
Probably the temperature variation does not directly affect the H/V amplitude but is responsible of other mechanisms like: (i) increasing of the fracturing degree of the medium acting directly on the dilatancy
of the rocks (an increase in the medium fracturing may result, directly or, more often, indirectly, in density or velocity of propagation variations); (ii) influencing the water content of the superficial layer leading to an increase of the wave velocity of this portion of the slope.
Iverson  proposed that landslide motion is regulated by a, which depends on the dilatancy
angle and the intrinsic timescales for pore pressure generation and dissipation.
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.
Mirzabozorg, "Parametric assessment of salt cavern performance using a creep model describing dilatancy
and failure," International Journal of Rock Mechanics and Mining Sciences, vol.
and fracture-induced velocity changes in rock and their relation to frictional sliding.
It is obvious that these materials should be treated as discrete elements, and that the mechanical properties of these materials depend on properties of individual particles, thereby, some of them such as packing density, flowability, dilatancy
, crushability, friction, etc., are highly contributed by the particle shape.
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.