Influence of the Drainage in the Reinforced Soil Wall during Seepage Flow

A series of centrifuge model tests were carried out to investigate the reinforce mechanism of multi-anchored soil wall during seepage flow, and to verify the contribution of drainage to the performance of such soil structures. It was found that the smaller shear deformation of backfill and the smaller settlement of the top surface of soil wall were observed with the larger drainage. Namely, the appropriate construction of drainage is important to prevent the ground water behind facing wall rising and to keep earth pressure constant without increasing by increase the pore water pressure. The safety factor which means the whole stability of pull-out resistance of reinforced soil wall rather than that of each layer of installed tie-bar, is important to express the stability of such soil structure failed along the slip surface.