ABSTRACT
At present many people, Barla (1974), Kwasniewski (1993), believed that the cause of the anisotropy of rock mass could be divided into two categories: one was the anisotropy of the rock, the other was the conditions of the joints. And the anisotropy of rock mass was mainly due to the joints. Jeajer & Cook (1969) studied a single joint rock mass and found that the anisotropy of rock mass was controlled by the dip angle of the joint. His work provided a good beginning and many research results of the anisotropy of rock mass were based on it, like Priest (1993), Ramamurthy & Arora (1994), Qiao (2004), Mao & Yang (2005).
