Behaviour of a tunnel face reinforced by bolts: Influence of an deviated installation

摘要

In recent years, there have been numerous studies into the behavior of tunnel face reinforced with bolt, but most of study supposed the parallel installation of bolts. Although, in general, the installation of bolt was parallel to the excavation directions, boring hole was bended according to geological conditions and operation techniques in many cases when conducting the boring in the fields. This paper presents the results of laboratory investigation on the deformation behavior of tunnel face reinforced with bolts. Although the reinforcing effect is significantly influenced by the construction conditions, we focused particularly on an installation angel of bolt.