Abstract
Back-fill grouting of shield driven tunnel is significant for not only surrounding media but also acting load on tunnel. Insufficient back-fill grouting may lead enormous amount settlement of ground surface and concentrated load may act on the tunnel. A back-fill grouting model tests have been carried out and a discussion about the behavior of back-fill grouting of shield driven tunnel in this paper. Some elementary tests for grout material have also been done. The differences of the material, pressure of injection and stiffness of surrounding ground varied the behavior of back-fill grout shape.
