INVESTIGATION OF ULTRASONICS SOUND WAVES (P AND S) BEHAVIOUR UNDER DIFFERENT PRESSURE FOR IGNEOUS ROCKS

10th International Multidisciplinary Scientific GeoConference - SGEM2010, www.sgem.org, SGEM2010 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 20-26, 2010, Vol. 1, 461-468 pp

ABSTRACT

An ultrasonic sound wave has been used in rock mechanics to determine rock properties
for many years. Because it is a relatively simple, low-cost and non-destructive testing
method compared to others. Water content, porosity, and cracks in the rocks structure
are some of the most important parameters for P and S-wave speed. In Rocks, under
uniaxial compression stress, the account of space inside the compressed rock is reduced
while an ultrasonic sound waves speed is increased. However, after a certain level of
compression; with the formation of micro-cracks, ultrasonic sound wave velocity is
decreased.

To determine the maximum ultrasonic wave speed in rocks, 11 different igneous rocks
for dry and water saturated samples using Pundid Pulus test device were tested under 7
different loads (0, 0.5, 1, 5, 10, 15 and 20 kN). In order to investigate the changes in
ultrasonic sound velocities, the density of rocks, water absorption ratio by weight and
volume, porosity values are compared with Ultrasonic wave speed.

Keywords: Rock Properties, Ultrasonic, P and S-waves, Pressure, Igneous Rock