Abstract
For the design of a rock bolt in a tunnel construction, the standard patterns of the installation of a rock bolt are mostly employed. The standard patterns are determined by engineering experiences or geological categories. Therefore, there is a possibility of the overabundant design of a rock bolt. In order to improve the design of a rock bolt, many experiences were conducted and gave us a valuable knowledge. Most of them used the rock specimen having a cut-through joint so as to seize the performance of the installation of a rock bolt, but this kind of situation is considered to be rare in a rock mass during the construction of a tunnel. Most of rock joints are included in a rock mass and their deformation is constrained by the rock mass. Therefore, there are some questions about the knowledge from room tests to seize the performance of the installation of a rock bolt. Thus, in this article, several analyses with various size of joint included in a rock mass are carried out, and the installation effects of a rock bolt are discussed from an analytical point of view.
