Abstract
This study investigated the effect of vegetation plant roots on the stability of the cover slopes of solid waste landfills. A large direct shear test and a root tensile strength test were conducted to quantify the effect of rooted soil of revegetation plants on the increment in shear strength of the soil as a method to protect the cover slope of solid waste landfills. In the large direct shear test, an increase in the shear strength of the ground with the presence of roots was observed, and the root reinforcement proposed in the literature was modified and proposed by analyzing the correlation between the root diameter and the tensile strength according to water content. The stability of the slope revegetation of a landfill facility, considering the root reinforcement effect of revegetation, was calculated by conducting a slope stability analysis reflecting the unsaturated seepage analysis of rainfall conditions for various analysis conditions, such as the gradient, the degree of compactness, the thickness of the cover, and the rooted soil depth of the landfill facility.
Highlights
Geotechnical Engineering Department, Kyong-Ho Engineering & Architects, Seoul 05702, Korea; Abstract: This study investigated the effect of vegetation plant roots on the stability of the cover slopes of solid waste landfills
A large direct shear test and a root tensile strength test were conducted to quantify the effect of the rooted soil of revegetation plants on the increment in shear strength of the soil
The shear test was performed on non-vegetated soils under the same conditions, such as the block sample containing roots in a large direct shear test, using the result of a field unit weight test in order to analyze the change in shear strength of the ground with roots present
Summary
The final covered layer of a solid waste landfill must satisfy various requirements such as preventing the inflow of rainfall, preventing the generation of toxic gases and odors, and supporting plant growth. Slope protection afforded by vegetation prevents the direct inflow of rainfall on the slope’s surface, securing stability against surface layer loss and scouring, owing to an increase in shear strength provided by plant roots. This creates a visual sense of harmony with surrounding vegetation [1]. Unsaturated seepage analysis is performed considering the maximum rainfall intensity and rainfall duration, and the seepage–stability coupling analysis is performed to present the stability conditions for the cover slope of a solid waste landfill
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