In this section, the influences of the influence radius of the tunnel face RL on rock stresses and displacement as well as support pressure are investigated. According to Eq. (1), when α and v are constant, the larger RL is, the broader the range of stresses released is. Therefore,supposing that α and v are constant, which are listed in Tables 1 and 2, the RL parameters of the two rocks are both set to three levels:2.5r0, r0 and 0.5r0.