Back-fill Grouting Model Test for Shield Tunnel

Yukinori KOYAMA,
General Manager,
Structure Technology Development Div.,
Technological Development Dept.

Yutaka SATO,
Engineer, Tunnel Group,
Structure Technology Development Div.,
Technological Development Dept.

Noriyuki OKANO,
Engineer, Tunnel Group,
Structure Technology Development Div.,
Technological Development Dept.

Mitsuru SHIMIZU,
Head of a Section
Construction Engineering Center
Construction Department
East Japan Railway Company


Back-fill grouting of a shield-driven tunnel is significant not only for its effect of stabilizing the surrounding ground but also for that of acting as a load on tunnel. Back-fill grouting model tests have been carried out and the behavior of tunnel and the surrounding ground is discussed in this paper. Ground displacement and acting load on the model tunnel were measured during the grouting. As a result of the model testing, it is found that injection pressure and ground densities significantly influence pressure of the tunnel and ground displacement.