INDOT is implementing its Retaining Wall Inventory Program as part of its Transportation Asset Management Plan. The program was developed in response to observed incidences of deficiencies during construction as well as post-construction performance and maintenance issues. In this session we present the inventory collection process and share thoughts on potential applications of inventory data to improve the methodology for design, construction, and maintenance of retaining walls

Bain, Andrew

Goldner, Robert

Khedekar, Nikhil

Turk, Aamir

English

Purdue E-Pubs

Creation of Statewide Inventory for INDOT’s Retaining wallsAamir Turk Andrew BainNikhil Khedekar Robert GoldnerRetaining WallAsset ProgramAamir TurkGeotechnical Asset Management PlanPhase I• Know your Assets• Quantify Your Assets• Data & Condition Assessment• Condition based Ranking & Monitoring programStrategy and Planning• Limited in-house resources• Development of Criteria & guidelines• Selection of consultants• Collection of data• Implementation Retaining Wall Asset Program• Streamline In-house resources• Drafted INDOT Inspection Manual for Retaining walls• Hired consultants with experience in GAM• Using ArcGIS, ESRI application to input data• Condition ratings of walls recorded• Monitoring Program → Interface to Phase IICollect Asset Inventory• Hired consultants• Collector App, ESRI (GIS based)• Consultants inspect assets as per INDOT inspection manuals• Collect inventory- Office* Plans* Reports• Collect inventory- Field* Permissions / Coordination* Inspection & Condition ratingRetaining Wall Asset Program• One consultant per two districts* La Porte & Fort Wayne- RII (Northern IN)* Crawfordsville & Greenfield- WSP (Central IN)* Vincennes & Seymour- CTL (Southern IN)• Ensure not to overlap with the Bridge Inventory dataRetaining Wall Asset ProgramInventory challenges• Many dated structures without any records• Design Data available only for last 10 -15 years• Many structures and their locations are unknown• Asset life of such structures is unknown• Physically searching undocumented structuresCollector Application & Pre-Field WorkNikhil KhedekarArcGIS Collector• Application for Inventory of wall data• General Information about the retaining wall• Location, Type, Height, Orientation, Owner, Wall condition Rating etc.• Only the walls that are taller than 5 ft (exposed height) at any point along the wall are included.• Culvert headwalls, abutment wingwalls, soil nail walls and noise walls are not included.Retaining Wall Collector AppWall Type Legend-• Masonry• RC Cantilever• RC Counterfort• Pre-stressed Concrete• Cantilever Sheet Pile• Anchored Bulkhead• Diaphram• Bored Pile• Soldier Pile• Reinforced Earth• MSE• Timber• Bin• WireTypes of Wall Elements-Primary SecondaryVertical Supports CopingFoundations Leveling PadAnchors DrainageWall Facing SlopesArcGIS Collector – Types of WallRetaining Wall Asset ProgramFields for data input in app• Vendor name- CTL / RII / WSP• Arrival date & time- 2/12/2019, 11:11 AM• Departure date & time- 2/12/2019, 11:22 AM• Observer name- John Doe• Weather Condition- Sunny 35°F• Wall Type- MSE• Associated Feature- Bridge abutment• Incenteroid facing direction- West• Wall Facing Type- Precast concrete panel• Panel height- 5 ft.• Panel width- 10 ft.• Wall design method- LRFD• Latitude- 41.06792471• Longitude- -85.01113566• Altitude- 235.2605231• Wall height- 22ft• NBI- 000000• Des- 1234567• Public Safety Rating- GreenArcGIS Collector – Inventory of WallRetaining Walls Defects• Bulging• Corrosion• Cracking• Connection• Distortion• Horizontal rotation• Separation• Vertical rotation• Backfill Leakage• Damage• Delamination/ Spall• Erosion• Exposed rebar/ fabric• Efflorescence• Graffiti• Vegetation• Abrasion/ wear (concrete)• Freeze-thaw damage• Masonry displacement• Mortar breakdown• Patched area masonry• Rust stains• Split/ spall masonry• Settlement Perform preliminary inspection to visually identify defects. Include location, photo, sketch and brief description. Following is the list of defects,  Perform secondary inspection in future based on the defect rating. Secondary inspection could involve digging, excavating, drilling, or geophysical studies.ArcGIS Collector - DefectsRetaining Walls Rating CodesDefect Rating Codes• Code 9- Excellent ( Recently installed or recently repaired)• Code 7- Good (No repairs needed, next inspection to be examined)• Code 5- Fair (Significant defects, frequent inspections)• Code 3- Poor (Structural issues, repair by qualified contractor)• Code 1- Critical (Failing or failed, major mitigation or replacement)Overall Retaining Wall Rating Codes are auto populated based on the lowest defect rating.Retaining Walls Rating CodesPublic Safety Rating Codes• Green flag- No danger of failure• Orange flag- Repairs needed• Yellow flag- Public safety issue, closure of lane/ traffic• Red flag- Roads relying on wall for support are closedPre-field Work• Initial wall list by INDOT• Federally and State Funded wallsPre-field Work• Initial wall list by INDOTPre-field Work• Reconnaissance for additional walls• Walls identified during field-trips• Walls identified on Google maps & Street-viewPre-field Work• Wall List for each county• Schedule Inspection• RR Permissions• Co-ordinate with INDOTPre-field Work• Obtaining Wall Plans & Geotech Report• From INDOT Archives & ERMSLessons Learned• Not all walls have record plans• Many walls and their locations are unknown• ERMS did not provide plans and reports for all the walls• Searching for specific wall plans and Geotech reports from INDOT archives can be time consumingField Work and Collection Of WallsAndrew BainField Collection of Walls• 2 member teams of qualified retaining wall inspectors• iPads with ArcGIS collector app• Purpose:• To collect information about wall location, geometry, and defects• To provide performance oriented rating of existing wall Purpose (con.)Bridges• Systematically cataloged and inspected – National Bridge Inventory (NBI)Retaining Walls• Numbered on construction contract documents (project-specific)• Do NOT “roll-up” to existing database• Not inspected with regularityKey Step: Field Collection of walls to establish and populate retaining wall inventoryField Work Process1. Pre-populate map for field crews to have direction (pre-field work)2. Locate walls and input geometry/location data3. Examine walls for defects4. Take Pictures5. Input defects and wall ratings6. Submit for ReviewWall Geometry and Location Collection• Access / Safety• GPS wall location services with iPad• Wall Types• Wall Details• Maximum exposed height• Exposed wall facing areaField Collection - Defects• Defect Type• Measurements/Scale• Location on wall• Importantly: Defect RatingDefect Ratings• Numbered description of defect severity:• 1, 3, 5, 7 or 9• Corresponds to measurable action stepsWall Ratings• Walls rated based on presence and severity of observed defects• Through defect and rating descriptions, we can create a system of criteria for defining the current state of the asset – with specific response actions for increased inspection or immediate remediation, if needed  Asset Management - Defects• Identify most critical locations for maintenance funding• Response actions• Able to view pictures and descriptions of defects• Can compare at touch of a button to see if deteriorating conditions• i.e., is this problem or perceived problem getting worse?Asset Management – Defects (con.)• Sorting Data• Examples:• Type of walls or wall elements corresponding to defects• Location of walls corresponding to defectsLessons Learned• Work Flow• Walls split between bridge and road plans• Need for a robust server• Flexibility of entry fields • New technology – taking advantage of satellites, Google Earth and cellular networkWall InspectionInventory and AssessmentDuring ConstructionRobert GoldnerField Observations• Initial observation of a defect• Could the defect be causing a bigger problem?• If so, investigate the possible “bigger problem”.• Examples  Inspection During Construction• Especially critical in MSE Wall Construction• Should be 100% inspected• Training of contractor and inspection staff should take place prior to work.Retaining WallAsset ProgramAamir TurkGeotechnical Asset Management PlanPhase II• Effective tool for planning• Monitoring asset performance• Risk Assessment• Life cycle cost analysis• Update inventory and condition assessments• Program as a project• Cost estimates for mitigation/ replacement

Creation of Statewide Inventory for INDOT\u27s Retaining Walls

https://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=4380&amp;context=roadschool

Creation of Statewide Inventory for INDOT\u27s Retaining Walls

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