CENTRIFUGE MODEL TEST ON HORIZONTAL RESISTANCE OF A CAISSON WITH BACK-FILLING OF SOLIDIFICATION SOIL

To increase the sliding resistance of a caisson type breakwater against wave force, it is effective to provide back-filling behind the caisson. In this paper, a solidification soil was used as back-filling behind the caisson, and its effect was evaluated by a centrifuge model test. According to the test results, it was confirmed that the sliding resistance increased by back-filling of solidification soil was consist of two components, i.e., one is the shear resistance of the solidification soil and the other is the frictional resistance between the solidification soil and the sand foundation at the bottom of the solidification soil. Therefore, to increase the sliding resistance in drastic, it is considered to be effective that the strength of solidification soil is increased and the prevention works are constructed for preventing the solidification soil from sliding on the sand foundation.