'Periodica Polytechnica Budapest University of Technology and Economics'
Abstract
Different Hungarian volcanic tuffs (andesite tuffs, basalt tuffs and
rhyolite tuffs) were investigated with the goal to determine the influence
of the water content on their strength. The following petrophysical
constants were measured for all the samples both in dry and saturated
conditions: bulk density, ultrasonic wave velocity, uniaxial compressive
strength (UCS) and Young´s modulus. The destruction work (strain energy) was
calculated from the measured stress-strain curves, as well.
The influence of the water for the UCS, impedance (scalar of the density and
the ultrasonic wave velocity) and the destruction work is shown. In these
cases linear relationship can be written between the dry and the saturated
constants. Both linear and power equations can be used for the effect of the
water on Young´s modulus. Finally the UCS is written as the function of the
density and the impedance