花崗岩の圧裂強度実験結果のばらつきに関する研究

抄録

Several kinds of diametral compression tests were performed to check what the major parameters that scatter tensile strength are. One of them was as carefully an arranged experiment as we could possibly do. Another one was a roughly arranged experiment, which is probably usually performed. Between these two extremes, three kinds of experiments varying in some parameters, like testing machine, cylindrical surface grinding, spherical seats and orientation of splitting plane, were carried out. Oshima granite was chosen for these tests. The tensile strength for the carefully arranged experiment showed minute scattering. Experimental results indicate that in order to get meaningful data, it is necessary to fix the split plane with respect to the axes of anisotropy, at least for granitic rocks and that the design of the spherical seats and the readjustment of the spherical seats after a slight loading are also important.