Study on 4-centered shield behavior in soft ground

摘要

The developed shield behavior measurement system with high accuracy was applied to Roppongi Subway station construction site in Tokyo to make clear the 4-centered shield behavior during construction precisely. Based on the obtained yawing and rolling angles, the 4-centered shield behavior was examined, taking account of the shield operation, such as the operation of the jack pattern, the copy cutter, and the articulate mechanism. As a result, the followings were made clear: 1) the behavior of the 4-centered shield on horizontal plane is similar to that of a circular shield; 2) the articulate mechanisms together with the copy-cutter can control the shield rotation, since those functions can adjust the relative ground displacement, which defines the ground reaction force.