風化花崗岩の強度特性について

Abstract

In this paper the strength characteristic of weathered granite are investigated in relationwith propagation velosity of ultrasonic longitudinal and shear waves. The uniaxialcompression test and Brazilian test were carried out. Two kind of sample were used inthese test. One is naturally weathered granite gathered at Rokko mountains, the otheris artificially weathered granite by applying freezing and drying cycles.Main results from these test are as follows;1) The uniaxial compression strength qu and the tensile strength St increase linearlywith the velocity of the longitudinal and the shear waves (Fig.-2).2) qu decreases hypabolieally and St decreases linearly with the weathering index.Qu/St increases with increasing of the weathering index.3) The propagation velocities of ultrasonic waves diminish somewhat with increasingof repitational number of freeying and drying cycles.