未固結砂層トンネルにおける鏡ボルトの補強効果に関する模型実験

概要

論文の詳細を見る
In the tunnel excavating unconsolidated sandy layer, it is important to stabilize the cutting face and to prevent the surface settlement. Various auxiliary methods of tunnel construction are used by this purpose, but it becomes the effective method to execute the long face bolts with the pre-lining recently. The design method about the length and the interval of the face bolts is not established, and it is the present conditions that it is executed the work based on the past results. As the effect of the face bolts for the cutting face stability and the surface settlement control, it is thought that reinforcement effects are different according to length and the interval. In this study, we changed the length and the interval of the face bolts by the two-dimensional model test used Toyoura-sand and examined the influence level on the effect of the face stability and the surface settlement.