Much research has been carried out on the time-dependent behavior of rocks. It is well known that uni axial compressive strength increases as the strain rate becomes larger. Rock in general mainly contains microscopic cracks. In process to failure, cracks seem to develop parallel to the loading direction from the tip of microscopic cracks. Therefore, it is important to pay attention to the behavior of the circumferential strain when the time-dependency of stress-strain characteristics of rocks is examined. In this study the uni axial compression test are carried out using tuff , and the effect of stress rate on the stress-strain behavior is described.
There is little research on the mechanical characteristics of rock under tensile stress compared with the research on compressive stress. In this study, firstly, direction, length and number of micro cracks were investigated using Inada granite.Secondly, the uniaxial tension test is carried out with the specimen produced in a different direction, an anisotropy of uniaxtial tensile strength, Young's modulus and Poisson's ratio are investigated. In addition, to focus on the effective sectional area of the specimen, considered results on anisotropy of Young's modulus and uniaxial tensile strength were described.
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