Abstract
Sand mastics, which have flow characteristics at high temperature, are useful for impermeable joints between impermeable sheets and impermeable bed in gentle slope-type seawall for controlled waste disposal. On the other hand, the strength is also dependent on the temperature. In this study, centrifugal model tests and FE analyses for a gentle slope-type seawall with sand mastics have been carried out in order to investigate the strength characteristics, the influence of the geomaterial characteristics and impermeable sheets on the stability.
From experimental results, it was revealed that deformation of sand mastics was restrained by a constant overburden pressure. In addition, the strength decreased with the decrease of eccentric load due to a weight of the seawall and was evaluated as 2.5 kN/m2 at 25 degree. From analytical results, it was shown that the stability of the seawall increased in the case of using geomaterials with large internal friction and impermeable sheets with large friction between geomaterials and sheets.
