Shigen-to-sozai, Vol.116, No.2, pp.97-104.
Attenuation of Elastic Wave Velocity / Height
and Lateral Strain in Uniaxial Compression
test with
special attention to the results of uniaxial
tension test
Seisuke OKUBO1, Katsunori FUKUI1 and Tomonari OGIINO1
| 1. Depertment of Geo-system Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113 8656 |
| The study was started mainly to investigate
horizontal velocity change and attenuation
not only in pre-failure region but also in
post-failure region. Beyond the strength failure point, ten rocks were tested in uniaxial compression and elastic-wave velocity and wave height in lateral direction were measured. Typically, the velocity and the wave height started decreasing at relatively low stress level in pre-failure region. The wave height decreased more rapidly than velocity; (Wave height change) / (Initial value of wave height) =3 (Velocity change) / (Initial value of velocity). It was also found that the velocity and the wave height were correlated with the lateral strain which increased with crack number and length within a rock specimen. The experimental results in compression were compared with those in tension which had been carried out by the authors, and two interesting findings were obtained. 1) At the strength failure point of Inada granite and Akiyoshi marble, the lateral strain in uniaxial compression test was close to that in uniaxial tension test. 2) Energy loss in a loading-unloading cycle in uniaxial tension test was compared with the attenuation of elastic wave in uniaxial compression test, and a good correlation was found between the two. |
| KEY WORDS: Rock, Elastic Wave, Elastic Wave Velocity, Attenuation, Uniaxial Compression Test |