Abstract
In constructed the pre-cast tunnel structures, it assumed that the earth pressure acting on the tunnel lining is larger than the overburden pressure and the bending moment becomes increasing. In particular, in case of higher overburden, tunnel lining must be became heavy thickness so as to support the large earth pressures. This is the reason why the pre-cast tunnel structures are mainly used in the shallow overburden tunnels. In this paper, performing two dimensional trap door tests using by the aluminum rods layer, the earth pressure and the bending moment on the pre-cast tunnel lining models are measured in consideration of the constructed process. Then, to introduce the lower stiff material around the tunnel lining, the effect of the lower stiff material are verified. Based on the experimental results, it is found that the earth pressures acting on the tunnel lining can be decreased to applying the lower stiff material.
