PROBLEM TO BE SOLVED: To largely reduce construction cost, by reducing a scale of a ground improvement of a submerged bank part, in an artificial shoal or a dry beach of using dredge soil as an infilling material.SOLUTION: A reinforcement soil layer B is provided on the shore side of a submerged bank A, and the submerged bank A is constituted of submerged bank parts a1 and a2 of upper-lower two stages, and these submerged bank parts a1 and a2 are provided so that a part of a bottom surface of the submerged bank part a1 of the upper stage contacts with a top end surface of the submerged bank part a2 of the lower stage, and the reinforcement soil layer B is constituted of reinforcement soil smaller than unit volume mass in water of a component of a submerged bank A in unit volume mass in the water, and becoming 40 kN/mor more in uniaxial compressive strength after 28-day curing, and is provided by contacting with a residual part and a side surface of the bottom surface of the submerged bank part a1 of the upper stage and a side surface of the submerged bank part a2 of the lower stage.SELECTED DRAWING: Figure 1
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