Evaluation of Landslides along Alabama Highways
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2019-08-01
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Abstract:Slope stability management systems (SSMSs) have been developed by multiple state transportation agencies to assess landslides adjacent to highways and aide in the effective allocation of resources for slope and/or roadway repairs. SSMSs catalog and analyze slope failures through the use of three main components: a landslide data collection system, a Geographic Information Systems (GIS) database, and a hazard prioritization system. The components form a landslide management system used for the identification or prediction of landslide risk areas and the determination of landslide hazards to motorists. This report reviews the landslide database component of SSMSs employed by other state transportation agencies. The descriptions of each SMSS detail the analysis purpose, database framework, and recorded data, which were all used in the design of the database and data collection system for the proposed SSMS for the Alabama Department of Transportation (ALDOT). The data collection system and landslide inventory of the proposed system are described, including the database structure, data sources and collected attributes. Preliminary observations from the database are discussed. The information from the landslide database is used to identify possible remediation measures that would be effective for stabilizing slopes along Alabama highways. This is accomplished by selecting multiple case histories from the landslide database which can then be analyzed to identify possible remediation techniques that can address the failure mechanism at that site. Some case histories where shallow slope failures have been caused by rutting from mowing activities along slopes are also included. A simple prioritizing scheme is suggested to allow the different remediation techniques to be compared and the optimal technique to be selected. Recommendations are provided regarding the most promising remediation techniques and areas where changes could be made to design or operations to improve slope stability along highways. Topics related to this study that could benefit from future research are also identified.
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