Repair Work for Tunnel Lining Using Basalt Plates and its Application Examples

Abstract

Most of the railway mountain tunnels were constructed before the war, and spalling may occur due to deterioration or cracking. In railway tunnels, the repair method is required that does not invade the cross section as much as possible and can be applied even for a short time. The authors have developed the repair method using FRP plates made from basalt fiber as a countermeasure against the spalling of mountain tunnels lining in service. In this method, the FRP plates are bonded to the tunnel lining with an epoxy resin and fixed to the tunnel lining with anchors and stainless-steel plates. By the basalt plates, the effect of reinforcing the tunnel lining and preventing falling off of the concrete blocks can be expected. In addition, the effect of preventing spalling of small pieces from lining also can be expected. In this paper, the outline of the development method is explained, and the application examples are introduced.