Abstract
Multi-faced shield tunnel method can construct plural tunnels at a time and therefore it has an advantage of enhancing safety and shortening delivery. However, its posture control is complicated because of the unbalance in cutting torque caused by the existence of plural cutter faces and of the relatively highly situated gravity centre of the shield machine. To cope with these problems, a vertically doubly-faced shield machine with articulate mechanism was manufactured on trial and the real ground excavation was carried out at field. It revealed the characteristics of its posture change as well as the effectiveness of proposed evaluating method of reaction force at the cutter face and rolling characteristics.
