切羽安定化のための鏡ボルトの効果

抄録

When tunnels are excavated under bad condition, auxiliary methods such as forepoling, face bolt, shotcrete are often used to keep the tunnel face stable. To use the auxiliary methods appropriately, it is necessary to clarify the mechanism of its effect and to evaluate its effect correctly.
In this paper, centrifugal model tests and three-dimensional Finite Element Method were carried out to verify the effect of face bolt for the tunnel face stability and to investigate the influence of face bolt length and position on the face stability.