Tongass Corridor - Geotechnical Asset Management Research

2017FUNDING NUMBERS AKSAS/Fed Project No.: 80900/STP000S(802) AKSAS/Fed Project No.: 62467/STP000S(126)PDFTech ReportSTP4000(126)(B)Rock slopesRetaining wallsCulvertsGeotechnical engineeringGeotechnical Asset ManagementGAMUnstable SlopesCorridor Health IndexTransportation Asset ManagementRetaining Wall InventoryRetaining Wall RatingsRockfall RatingsLandslide RatingsAlaskaAlaska. Dept. of Transportation and Public Facilities. Research and Technology TransferBeckstrand, Darren L.Mines, AineYamasaki, KenjiMcCormick, CollinLandslide TechnologyAlaska. Dept. of Transportation and Public Facilities. Research and Technology TransferNTL-ENERGY AND ENVIRONMENT-ENERGY AND ENVIRONMENTUS Transportation CollectionThis report documents and presents the results of a study developing a Corridor Health Index that incorporates managed pavement and bridge assets as well as geotechnical assets. Geotechnical assets included rock slopes, unstable soil slopes, and retaining walls. Assessment of these assets adhered to the procedures developed and tested here and in the concurrent statewide Geotechnical Asset Management (GAM) program. The research utilized existing pavement and bridge ratings. Culvert ratings followed a simple observation-based evaluation of culvert function. The Corridor Health Index developed provides a weighted 0 to 1 index score. The index score corresponds to a Poor (0) to Good (1)condition, respectively. Application of the Index to North and South Tongass corridors helps the Department advance projects taking into account a number of potentially poorly performing assets. Research results have matched with Department priority setting, with a major rehabilitation project on South Tongass that repairs unstable slopes and retaining wall assets. Incorporating risk to the existing narrow Right-of-Way and potential effects of failing geotechnical assets on the adjacent parcels assist in identifying where geohazard and degraded asset conditions coexist within close proximity to private property