open access

https://hdl.handle.net/2115/48970

Effects of bituminous layer as backfill material on mechanical behavior in tunnel model

英語

2001

International Road Federation (IRF)

This paper describes the effects of bituminous material as a backfill material on mechanical behavior in model tunnel in laboratory. It is known that load spreading and relaxation of bituminous material are good properties. Then if we use bituminous material as a backfill material of tunnel, the tunnel will have waterproof, good load spreading property. We used new bituminous material (Aquaphalt) which can solidify in water. We conducted relaxation test in tension for new bituminous material at various temperatures and obtained relaxation modulus of bituminous material at various temperatures. We performed experiment with line load for plastic tube (Diameter: 30cm) with or without bituminous material (thickness: 3cm) and compared with the results of theoretical analysis using FEM visco-elastic soft program and relaxation modulus of bituminous material which was obtained by relaxation test in tension. As the results, if load applied to the tunnel with bituminous material, strain and stress induced with load in plastic tunnel model decreased, comparing with that of without bituminous material and coincided with theoretical results. Then, it is concluded that it is very effective to use bituminous material as a backfill material to tunnel in order to obtain larger load spreading properties.

会議発表論文

Accepted Manuscript