Abstract
Rock is often considerably anisotropic. But it may be said that there has been no practical method of measuring it in the scale matching the insitu tests. The features of the newly developed method are that, 1) it requires only one hollow cylinder specimen to obtain a set of orthotropic anisotropy, 2) it does not require the directions of anisotropic axes to be known beforehand. To develop this new method, a simple and accurate solution of elastic deformation of the hole of an anisotropic hollow cylinder has been newly established. Further, an effective way of reducing the number of independent parameters for orthotropic anisotropy has been established through theories and measured data. Then it is shown that the anisotropy can be back-analysed stably using the deformation of the hollow cylinder.
