Abstract
Because the Fujikawa Tunnel was designed as a large-scale tunnel about 4,500-m long with an excavated section area of about 190m2, it has been constructed using the TBM pilot drift and enlargement method. Near the center of the tunnel, an Iriyama Fault fracture zone with a squeezing rock mass strength ratio between 0.3 and 0.7 was distributed over about 100-m. The TBM pilot drift excavation that preceded the excavation of the main shaft passed through the Iriyama Fault fracture zone without problems, thanks to the design and application of a high-torque, high-thrust double-shield TBM. The mechanical properties of the Iriyama Fault fracture zone were clarified through measurements of its behavior and were classified based on an analytical model. In this way, the support pattern was designed for high stiffness and high strength. Enlargement was planned based on early section closing using prior behavior control performed by injection type long fore-piling.
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