Recently a new type of double sheet wall was developed where the arc shaped sheet walls were connected by the truss structure. This is expected to be more economical than the ordinary type of sheet pile wall. However, the effect of the embedded depth of the arc shaped sheet wall and the width of the truss structure on the behavior of the sheet wall has not been investigated thoroughly.
　In this study, a series of centrifuge model tests was carried out to investigate these effects on the sheet wall behavior subjected to earth pressure of back fill. In the tests, three double sheet wall structures having different width were subjected to the back fill pressure under the 50 g centrifugal acceleration field to investigate the horizontal and vertical displacements, bending moment and axial stress distributions of the wall. In this paper, the model ground preparation and test results were described in detail.