花崗岩の異方性を考慮した変形・破壊特性に関する研究

抄録

Granite specimens were cored at π/12 radian intervals within the grain plane, and then loaded at constant strain rates of 10^-5, 10^-6 and 10^-7/s. The compressive strength varied about 10% in the different directions and about 15% under different strain rates. Young's modulus at low stress levels differed about 40% in the different directions. The Young's modulus defined by the linear part of stress-strain curve hardly changed. When the loading axis inclined at small angle to the grain plane, the strike of the fault was parallel to the grain plane. Except in the above case, the strike was always parallel to the rift plane. A ratio of the dilatant strain to the number of acoustic emissions increased with decreasing strain rate. Four independent velocities showed that the crack closure continued to the last stage of the loading and also showed that the dilatancy anisotropy should be affected by the rock fabric.