United States Department of Transportation
i
Synthesis on Rapid Repair Methods for Embankment Slope Failure: Final Report
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2019-02-01
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[PDF-6.11 MB]
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Edition:September 2017–July 2018
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Abstract:Although the majority of slope repairs using common repair approaches show a satisfactory performance, some repair attempts have shown a recurring failure after a period of time. Recurring slope failures happen frequently in Texas, due to the extreme weather and soil conditions. The Texas Department of Transportation (TxDOT) annually spends millions of dollars to repair embankment slope failures along the state roads and highways. The primary objectives of this research project were to (1) synthesize and critically evaluate existing methods for rapid repair of embankment slope failures, and (2) recommend appropriate implementation procedures to avoid recurring failures considering different district conditions. These methods were evaluated and compared based on various factors, such as (1) long-term performance and applicability to the embankment soil; (2) constructability considering the minimal impact to existing roadway and traffic conditions; and (3) ease of implementation by TxDOT maintenance workforces. The project findings clearly show that there are practices that could reduce the chance of recurring failures of repair methods, even for those methods that are highly prone to failure (e.g., rebuilding and compaction method). These recommended practices, representing the invaluable collective experience of several TxDOT engineers, supervisors, and maintenance crews, are highlighted in this research. Moreover, the results show that repair methods could be combined to prevent recurring failures. Case studies highlighted in this research present excellent examples of these combinations. The reduction in recurring slope failures could significantly reduce construction operations and maintenance costs.
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