Waste dragging mechanism during pile installation through the offshore waste landfill and its base clay layer

• Published in: Japanese Geotechnical Journal Vol. 15; no. 3; pp. 421 - 433
• Main Authors: KIKUCHI, Yoshiaki, HIRAO, Takayuki, TAKEMOTO, Makoto, KIKO, Masatsugu, NOMURA, Riki, HYODO, Taichi, NODA, Shohei
• Format: Journal Article
• Language: Japanese
• Published: Tokyo The Japanese Geotechnical Society 30.09.2020; Japan Science and Technology Agency
• Subjects: barrier clay layer; Clay; controlled landfill; dragging; Installation; Landfill; Landfill construction; Landfills; Offshore; Offshore construction; Penetration; pile installation; Piles; Scale models; Shape; Shape effects; Wall thickness; waste; Waste disposal sites; Wastes
• ISSN: 1880-6341
• DOI: 10.3208/jgs.15.421

In order to use the premises of the offshore waste landfill site highly, it is necessary to construct piles into the bearing layer. In such a case, piles penetrate through base clay layer working as a barrier. At that time, the pile should drag the waste into the barrier ground. This study examined the dragging mechanism of the granular wastes during pile installation by small laboratory model experiments. In the research, waste dragging effects of shape of the pile toe, level of consolidation pressure to the clayey ground, particle size of granular wastes were discussed. As a conclusion, amount of dragged waste was reduced by the selection of the shape of pile toe. Wastes with larger particle than pile wall thickness would rotate during pile penetration if the particle was eccentrically driven by the pile, and it will be removed from the pile toe after some amount of pile penetration.