2024 Volume 19 Issue 2 Pages 211-222
Strength and permeability characteristics of waste ground mixed with plastic, debris, etc. at inert waste landfill sites and illegal dumping sites were investigated using in-situ strength tests, boring investigations, and large column tests conducted at 27 waste ground sites (49 locations) in Japan and overseas. Waste ground mixed with long plastic and other materials has high shear resistance and also has high slope stability due to its unique tensile resistance. On the other hand, for collapses that occur domestically and internationally due to heavy rainfall and in which the deposited waste layer slides on the sloping subgrade, the slip resistance of the subgrade, which generally has low shear resistance, becomes dominant. The slope stability evaluation should take into account the long-term storage of rainwater on the upper surface of the sheet-like materials in the waste layer. The slope failure patterns that are mainly assumed based on the strength and infiltration characteristics are also shown.
