United States Department of Transportation
i
Monitoring and Assessment of Landslides Along Alabama Highways
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2024-10-01
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[PDF-20.38 MB]
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Edition:Final Report
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Abstract:Rainfall-induced landslides are a common occurrence along Alabama highways leading to significant damage to infrastructure and disruption to traffic. There are no current approaches in use to predict when these slides are likely to occur, which limits the ability of ALDOT personnel to respond or intervene. This study developed a monitoring and assessment program for landslides along Alabama highways with the goal of increasing the usability of current monitoring data and to provide approaches to predict when slopes are likely to move. This study explored different monitoring options and deployed automated monitoring tools at two high priority landslide sites in Alabama. In addition to monitoring at these sites, different options for monitoring deformations were tested during a large-scale experiment at the Advanced Structural Engineering Laboratory. A database of landslide events in Alabama was developed using historical inclinometer data provided by ALDOT. This database was compared with precipitation and soil moisture data to understand both patterns of landslide triggering and to develop a geotechnical health monitoring plan that can provide warnings when movements are likely to occur at unstable sites. The findings from this work highlight the importance of monitoring data to understand landslide movements and have identified thresholds that can be used to both assess areas where landslides are likely to have occurred following large storm events and to provide warnings of potential movements at landslide sites using forecast data. This report documents available options for landslide monitoring, findings from monitoring of two landslide sites, a comparison of the processed inclinometer database with previously published thresholds for landslide triggering, and development of a geotechnical health monitoring plan that can provide warnings when unstable movements are likely to occur. Recommendations for implementing this research into ALDOT practice are discussed, along with areas for future research.
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