Abstract
The capillary barrier is necessary to make larger the gap of particle diameter of sand and gravel material. The functional deterioration of capillary barriers in service for dozens of years is of concern because of the transport of sand particles to the lower gravel layer due to an earthquake. The authors found that the inclusion of sand particles into the lower layer can be reduced by using the crushed shell particles instead of gravel in the capillary barrier. In this study, the authors make clear the type, particle size of crushed shell and crushing methods of shells by column test using one dimensional cylindrical vessel and by laboratory experiment using a small sized shaking table. It is concluded that a paper selection of size and distribution of the crushed shell particles leads to a practical development of the capillary barrier which has long term durability and provides some possible solution to a recycling of fishery byproduct waste.
