抄録
Dilatancy of rock is interpreted as the accumulation of microscopic failures induced by deviatric stress, based on a great number of experiment and observation. However, the ability to express the quantitative relationship between stress condition and dilatant strain caused by such micro-scopic failure requires more research. In this paper, on the assumption that open cracks grow in consequence of failures, the equations which describe the stress-strain relationship were derived by applying the fracture mechanics.
The conclusions are summarized as follows;
(1) Secondary cracks generated by deviatric stress grow almost in the direction of maximum compressive stress.
(2) Dilatant strain caused by the crack growth is in inverse proportion to minimum compressive stress.
