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• W655258016 abstract "Straw wattles are common erosion control devices used to trap sediment during storm run-off. This paper examines the relationship of straw wattles on slope stability through a case study evaluating their use on steep slopes (1.5H:1V) for the US20 highway realignment project. Across the project site, several surficial slope failures, often bracketed by straw wattles, have occurred. As such, the wattles were hypothesized to contribute to the slope failures. To date, little is known about the effects of straw wattle placement on surficial slope stability. Prior studies have evaluated slope stability against slope height, slope angle, vegetation, rainfall, and other variables but have not yet assessed the influence of straw wattle placement on surficial stability. Several laboratory tests were performed to characterize the fill soil and the straw wattles for numerical modeling and evaluation. Straw wattles were shown to quickly absorb a considerable amount of water (achieving a water content of 400% within 15 minutes) and dry slowly (requiring several days at room temperature). Several numerical modeling scenarios were analyzed (varying the slope angle, slope height, straw wattle spacing and environmental conditions) to determine the overall effect of straw wattles on both shallow and deep slope stability. Overall, straw wattles were shown to have no significant effect on surficial slope stability, particularly compared to modeling uncertainty and soil variability. Other influencing factors such as slope angle, ground water elevation and environmental conditions have a much more significant impact on slope stability. The slopes themselves were found to have a low factor of safety (≤ 1.0, at the limit of equilibrium) against surficial slope failures and a higher factor of safety (>1.5) against deeper failures, regardless of straw wattle spacing. Investigations using 3D laser scanning (LiDAR) verified that straw wattles were installed horizontally along the same slope contours, therefore, not allowing water to pond behind the straw wattle, which would accelerate the surficial slope failures. These findings conclude that straw wattles have little effect on slope stability, especially on slopes with factors of safety above 1.0. It is expected that the reported erosion-control benefits of straw wattles outweigh the very minor effects on slope stability. However, on slopes with calculated safety factors at 1.0 and below, the effects on slope stability are still minor but mixed. In such cases, other erosion control measures, such as the use of a geotextile ground covering could be a more effective erosion control treatment." @default.
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• W655258016 date "2012-01-01" @default.
• W655258016 modified "2023-09-27" @default.
• W655258016 title "Investigation of Straw Wattle Influence on Surficial Slope Stability" @default.
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