Geotechnical Asset Management for Transportation Agencies, Volume 2: Implementation Manual (2019) / Chapter Skim
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P A R T B Starting GAM Implementation
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11 Implementing GAM At the simplest level, asset management is about managing physical objects with value. Regardless of asset type, even basic knowledge of an asset provides enough information to start asset management.
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12 Geotechnical Asset Management for Transportation Agencies, Volume 2: Implementation Manual appendices that include a brief guide to using the GAM Planner, and other online resources are available for download from the NCHRP Research Report 903 web page.) Workflow for Implementing GAM The implementation process described in this chapter is based on the simplified asset management workflow presented in Figure 2.1.
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Starting GAM 13 Step 1: Identify and Locate Geotechnical Assets Definition of a Geotechnical Asset In this GAM Implementation Manual, a geotechnical asset is an embankment, slope, retaining wall, or constructed subgrade that contributes to the performance of your transportation system. These assets also contribute to the performance of the many culverts, pipes, and utilities that penetrate these engineered structures.
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14 Geotechnical Asset Management for Transportation Agencies, Volume 2: Implementation Manual assets also may include natural slopes adjacent to a roadway. Slopes differ from embankments in that, rather than being constructed fill features, slopes are excavated into terrain or may consist of a natural slope that potentially generates a hazard.
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Starting GAM 15 Generally, retaining walls will have vertical or near-vertical faces and the recommended threshold inclination is 70 degrees between a wall and an embankment or slope that relies on inclusions for stability. The recommended wall height for incorporation into a GAM inventory is 4 feet, which is based on many examples of what defines a retaining wall in the engineering design process.
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16 Geotechnical Asset Management for Transportation Agencies, Volume 2: Implementation Manual Subgrade Assets Geotechnical subgrade assets consist of an earth material below the engineered pavement layers that creates a life-cycle management need. Examples of subgrade assets include constructed earthworks and ground improvements to address: • Swelling; • Compressible, frozen, or thawing ground; • Collapsible soil or bedrock; and/or • Threats from karst (sinkholes)
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Starting GAM 17 Asset Identification When establishing an asset inventory, it is first necessary to identify each geotechnical asset type. Each asset will need to be assigned a unique asset identification number (e.g., GA1, GA2)
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18 Geotechnical Asset Management for Transportation Agencies, Volume 2: Implementation Manual based on the judgment and experience of the asset manager. If desired, the GAM Planner can be expanded to incorporate up to 50 distinct asset-type models.
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Starting GAM 19 The purpose of using the segment concept during input of the inventory will become apparent later in the implementation process, particularly in the steps related to communicating results and performance, and those related to investment planning. The segment approach also allows the asset manager to consider the aggregated risk from various geotechnical asset types that have differing geographic characteristics.
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20 Geotechnical Asset Management for Transportation Agencies, Volume 2: Implementation Manual Figure 2.9. Asset O&M condition decision tree.
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Starting GAM 21 asset assessment photographs have been provided in Appendix D (available online) to help with understanding how individual assets can be classified using the decision tree.
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22 Geotechnical Asset Management for Transportation Agencies, Volume 2: Implementation Manual between traffic volume and magnitude of consequence. As an example, for an asset that has potential for a long closure but is located on a low-volume road and/or in an area with detour routes or other options that minimize economic and traffic disruption, the asset manager can select the inventory input option that includes "minor economic impacts." Conversely, if the asset could influence a significant volume of traffic such that even a short closure would cause significant economic and congestion impacts, the asset manager can select the consequence input option with "major economic impacts." Step 4: Review Treatment Recommendations For any asset, various life-cycle treatment options exist.
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Starting GAM 23 Scale Factor to multiply the predicted treatment cost by a specified factor. It is recommended that these types of adjustments take place as part of later process improvements after GAM implementation has started.
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24 Geotechnical Asset Management for Transportation Agencies, Volume 2: Implementation Manual • Modifying the geometry of an asset or placing buttress fill on a slope to create a more stable condition; • Excavating larger catchment ditches, heavy scaling and slope modifications, and/or installing barriers below a slope asset to reduce the potential for rock reaching the roadway travel lane; • Over-excavating and re-compacting a subgrade asset as part of a pavement rehabilitation project; or • Replacing or improving a significant quantity of deteriorated retaining wall facing elements. Typically, rehabilitation treatments extend the asset's service life through an improved condition.
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Starting GAM 25 point for prioritizing or modifying asset-specific treatment plans. These concepts are expanded in Chapter 8 of this manual, which presents recommended processes for improving the success potential of GAM implementation, enabling an agency to realize the benefits.
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26 Geotechnical Asset Management for Transportation Agencies, Volume 2: Implementation Manual inventory expands, and as GAM becomes easier and more familiar, thus enabling an agency to increase its GAM maturity level. Chapters 3 through 7 in this GAM Implementation Manual present information on the supporting processes and data that align GAM with the existing practice of TAM and that form the foundation of the implementation approach.
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