Anisotropy of Thermal Property, Ultrasonic Wave Velocity, Strength Property and Deformability in Inada Granite

DOI Web Site 10 Citations 36 References

Bibliographic Information

Other Title
  • 稲田花こう岩の熱特性，超音波速度，強度および変形特性の異方性
  • イナダ カコウガン ノ ネツ トクセイ チョウオンパ ソクド キョウド オヨビ ヘンケイ トクセイ ノ イホウセイ

Search this article

Abstract

After investigating the distribution features of the orientations of pre-xisting microcracks in Inada granite, anisotropy of thermal properties, ultrasonic wave velocities, strengths and elastic constants were examined by using specimens of the rock material, which were made up in three directions respectively perpendicular to the rift plane, grain plane and hardway plane. The results showed that the linear coefficient of thermal expansion, the permanent strain induced by thermal microcracking, the unconfined compressive strength of the specimens cut in R-direction perpendicular to the rift plane and the Poisson's ratio calculated from lateral strain in R-direction were greater than those of G-and H-directions. Similarly, the ultrasonic wave velocities, the Young's modulus at lower stress level and the tensile strength corresponding to R-direction were less than those of the other two directions. This anisotropy can be attributed to the density of the pre-existing microcracks in R-direction, which was greater than that in the other directions. However, there were some disagreements in the correlation of the microcrack density with the ultrasonic wave velocity or the Young's modulus at lower stress level in G-and H-directions. The measurement results in this study suggested that this characteristic might be caused by other reasons of rock texture except the distribution anisotropy of microcracks.<BR>In addition, degrees of the anisotropy of these physical properties were quantitatively evaluated. It is clear that the degree, which was defined as ratio of difference between maximum and minimum values of a physical property to the average of the values of this property in three directions, varied with the different items of the physical properties. As an example, the degree of the tensile strength was 57% and after all it was the maximum value of all the examined properties. When Inada granite was slowly and homogeneously heated to high temperatures of several hundred degrees centigrade, it was found out, that the degree of anisotropy might be enhanced due to the pre-existing microcracks, which were extended and widened in the heating processes.

Journal

Citations (10)*help

See more

References(36)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top