The Ultrasonic ＆ Acoustic Characteristics of Argillite under Different Stress Conditions

• Main Authors: Chiang, Chun-Wei, 張峻維
• Other Authors: Jyh-Jong Liao
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/93916703688343609081

碩士 === 國立交通大學 === 土木工程學系 === 84 === In order to investigate the variation of dynamatic elastic constantsand the static elastic moduli of a transversely isotropic rock under loadings,a series of uniaxial tensil tests and uniaxial compression tests was conducted on the cylindrical specimens of argillite. The results show that the variation of the static elastic moduli during loading depends on the degree of closing of the pre-existing micro fissures along the folliations,but the dynamatic elasticconstants are little affected by that,which are strongly varied with the magnitude od applied stress on the grains of the rock. For obtaining the five dynamatic elastic constants of a transversely isotropic rock from a cylinderical specimens with inclined folliations ,a exact solution is given and a testing method is recommended in the thesis. For increasing the accurace of the suggested method ,an optimization technique is adapted fordata processing. Additionally,acoustic emission was measured during uniaxial compression test .It was found that the Kaiser effect was clear and the acoustic emission was anisotropic for the argillite specimens.