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Riprap Filters and Stability of Riprap-Covered Slopes: Technical Report
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2023-02-01
[PDF-7.00 MB]
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Edition:Technical Report: 09/2021 – 08/2021
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Abstract:This research report documents the outcome of a study performed on riprap filters (granular and geosynthetic) and the stability of riprap-covered slopes. Erosion of the underlying soil through the riprap is likely to happen if there is a sufficient gap in grain size between the soil and the riprap. This gap is often the case, which is why a filter is needed. By combining existing literature, survey results, and laboratory testing in the Erosion Function Apparatus, researchers observed that a filter increased the efficiency of the system significantly. The two main types of filters, granular and geosynthetic, were used and are discussed in this report. Each one has its advantages and disadvantages, but generally, geosynthetic filters are preferred in current practice. Regarding the design of filters, a step-by-step procedure is discussed in detail in this report. The installation and pricing of filters are also discussed: geosynthetic filters are typically less expensive and easier to install; however, the challenge with geosynthetic filters arises when installing them underwater.
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