ABSTRACT
An application of the borehole dilatometer test, for the evaluation of the deformation characteristics of the foundation rock for the design of dam is studied. Then, the directional character of the modulus of deformation of anisotropic rock mass was measured along circumference of a hole during in situ expansion tests. These analyses are used to show how different degrees of rock anisotropy affect the variation of the modulus of deformation around the walls of a hole in which expansion tests are conducted.
