TUNNEL STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a tunnel structure reducing the damage of a tunnel wall surface following fault vibration displacement at the occurrence of an earthquake of a tunnel passing through a fault in a rock-bed. SOLUTION: An outside wall body 8 integrated with the wall surface of the rock-bed is formed of a wall surface of high rigidity formed with a widened open-cut part 3 across the fault 2. An inside wall body 9 having the same inner void cross section as a lining part of a normal lining 5 is provided in a position separated from the outside wall body 8. The inside wall body 9 has a plurality of ring bodies 10 connected in an axial direction and connected to anchor part ring bodies 12 integrated with the lining of the normal lining 5. A mutual joint part of the ring bodies 10, 12 is provided with an expansion joint 13 allowing sliding displacement in the axial direction of the tunnel. Leg bodies 14 formed of base isolating members are installed between the inside wall body 9 and the outside wall body 8 to constitute a base isolating structure in which displacement in a support direction is allowed. A seal part 15 for preventing the outflow of seepage water and preventing falling-in is installed at an opening of the fault 2 exposed to the widened and open-cut rock-bed surface. COPYRIGHT: (C)2006,JPO&NCIPI