Abstract
A new construction method of artificial tidal flat is developed, in which clay slurry is injected under the fixed layer covered by sand layer. The fixed layer of 70-100 cm thickness made of clay -steel slug mixture of clay is placed under the covering sand layer in order to increase the volume of clay slurry from a single injection point. To study the effect of the fixed layer, a numerical analysis and laboratory model tests were carried out. The volume of injected clay was 60% the calculated where the fixed layer was assumed as an elastic layer. This is because the fixed layer failed by the tension cracks. However, when the fixed layer was reinforced by the rope net method, the volume of clay slurry that could be injected was equal or more than that calculated in the analysis. By the reinforcement of rope net, the expansion of tension crack in the fixed layer was prevented and the injected clay expanded uniformly under the fixed layer.
