Post on 12-Aug-2020
Best Practices for RoadwayBest Practices for RoadwayTunnel Design, Construction,Tunnel Design, Construction,Maintenance, Inspection, andMaintenance, Inspection, and
OperationsOperationsNCHRP 20NCHRP 20--68A, Scan 0968A, Scan 09--0505
U.S. Domestic Scan ProgramU.S. Domestic Scan Program
SCOBS 2010 Annual MeetingSCOBS 2010 Annual Meeting –– K. ThompsonK. Thompson
NCHRP
Federal Highway AdministrationFederal Highway AdministrationAmerican Association of StateAmerican Association of State
Highway and Transportation OfficialsHighway and Transportation OfficialsNational CooperativeNational Cooperative
Highway Research ProgramHighway Research Program1
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DisclosureDisclosure
This scan is being conducted as a part of NCHRP Project 20-68A, the U.S. DomesticScan program. The program was requested by the American Association of StateHighway and Transportation Officials (AASHTO), with funding provided throughthe National Cooperative Highway Research Program (NCHRP). The NCHRP issupported by annual voluntary contributions from the state Departments of
Transportation. Partial support for selected scans is provided by the U.S. Federal
Highway Administration or other agencies. Each scan is selected by AASHTO andthe NCHRP 20-68A Project Panel to address a single technical topic of broad interestto many state departments of transportation and other agencies. The purpose of each
scan and of Project 20-68A as a whole is to accelerate beneficial innovation by (a)
facilitating information sharing and technology exchange among the states and othertransportation agencies and (b) identifying actionable items of common interest.
Further information on the NCHRP 20-68A U.S. Domestic Scan program is availableat http://144.171.11.40/cmsfeed/TRBNetProjectDisplay.asp?ProjectID=1570"
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BackgroundBackground
Recent events have highlighted the needfor national tunnel standards for new andexisting tunnels: Suspended tunnel ceiling collapse in Boston
Truck tunnel fire in southern California
Tunnel roof cracking in Colorado
Tunnel flooding in Virginia
2005 International Tunnel Scan
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2009 Domestic Tunnel Scan2009 Domestic Tunnel Scan
Proposed domestic scan on “Best Practicesfor Roadway Tunnel, Design, Construction,Maintenance, Inspection, and Operations”
Purpose:
Assist in addressing the need for nationaltunnel standards & a national tunnel inventory
Investigate tunnels on state, regional, & localhighway systems
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Domestic Tunnel ScanDomestic Tunnel ScanDevelopmentDevelopment
Scan proposal approved December 2008
Planning meeting held May 2009
Scan conducted September-October 2009
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Scan FocusScan Focus
Design & construction standards practicedby state DOTs & other tunnel owners
Maintenance & inspection practices
Operations, including safety as related toemergency response capability
Specialized tunnel technologies
Inventory criteria used by tunnel owners
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Scan FocusScan Focus
Including:
Fire suppression
Traffic management
Incident detection & management
Analysis, design, & construction repairs ofexisting tunnels
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Amplifying QuestionsAmplifying Questions –– Key TopicsKey Topics
Topic 1 – Specialized technologies currently used forexisting and new U.S. roadway tunnel design,construction, maintenance, inspection, and operations
Topic 2 – Standards, guidance, and best practices forexisting and new roadway tunnels in the U.S.
Topic 3 – Current criteria used by owners and statesto identify tunnels in their inventory
Specific questions for Topics 1 & 2 were grouped bydesign, construction, maintenance, inspection,operations, and a general topics group
Scan Team MembersScan Team Members
9Central Artery Tunnel, Massachusetts Turnpike Authority
Scan Team MembersScan Team Members
FHWA:FHWA: Jesus Rohena, Co-Chair, DC
Barry Brecto, WA
TRB Tunnels Committee:TRB Tunnels Committee: Fulvio Tonon, UT-Austin
Report Facilitator:Report Facilitator: Mary Lou Ralls, TX
State DOTs:State DOTs: Kevin Thompson, Co-Chair, CA Alexander Bardow, MA Bijan Khaleghi, WA Louis Ruzzi, PA Michael Salamon, CO
NCHRP Contract:NCHRP Contract:
Harry Capers, PrincipalInvestigator, Arora andAssociates
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Scan HostsScan Hosts
Western U.S.:Western U.S.:
Caltrans
Colorado DOT
Washington State DOT
Seattle DOT Sound Transit
Web Conferences:Web Conferences:
Alaska DOT
District of Columbia DOT
Pennsylvania DOT
East Coast:East Coast:
Chesapeake Bay Bridge andTunnel District
Massachusetts TurnpikeAuthority
Port Authority of New Yorkand New Jersey
Virginia DOT
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Domestic Scan Sites SelectedDomestic Scan Sites Selected
Boston, MA
NY/ NJ
Hampton Roads, VA
Denver, CO
Seattle, WA
San Francisco, CA
Alaska DOT Webinar
PennDOT Webinar
Washington DCDOT Webinar
Submersed Tube - Virginia
Eisenhower Tunnel - Colorado
Caldecott Tunnels in Oakland, CA
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Findings/RecommendationsFindings/Recommendations –– 11
Develop standards, guidance, and best practicesfor roadway tunnels.
Develop design criteria for new tunnels
Consider future rehabilitation
Use subject matter experts in advisory role
Develop design & construction standards &
guidelines for tunnel construction methods
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Findings/RecommendationsFindings/Recommendations –– 22
Develop emergency response system unique to eachfacility, considering human behavior, facilityventilation, & fire mitigation.
Perform facility fire ventilation study & develop plan;consider realistic spread of fire & smoke includingtoxic gases & heat, & effect of ventilation types on fire
Considering human instinctive response, improvefacility procedures to direct public to safety Consider better signage & intelligible public address systems
Consider additional research on spread of fire &smoke & how people react
I-5 Truck Route UC- RepairSanta Clarita, California
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Findings/RecommendationsFindings/Recommendations –– 33Develop & share inspection practices among tunnel
owners.
Make tunnel inspection programs as similar as possible
to bridge inspection programs
Load rate per AASHTO Manual for Bridge Evaluation;
do structural analyses after physical or load changes
Develop inspection frequencies, minimum
coding requirements, & federal coding manual
Develop baseline data inventory for tunnels
Communicate best practices
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Findings/RecommendationsFindings/Recommendations –– 44
Consider inspection & maintenance operationsduring design stage.
Involve all disciplines in design phase
Provide adequate, safe, & unimpeded access to allcomponents
Tradeoffs between access & a practical design have cost &safety impacts for inspection & maintenance over life oftunnel
Inspection & Maintenance Access
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Findings/RecommendationsFindings/Recommendations –– 55
Develop site-specific plans for safe & efficientoperation of roadway tunnels.
Develop concise site-specific operations manual
Implement state-of-the-art video surveillance &
communication systems
Develop separate incident response manual
Restrict hazardous cargo or if no alternate route,
develop well-defined emergency response &
ventilation plan
Operations Control Center
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Findings/RecommendationsFindings/Recommendations –– 66A tunnel includes a long-term commitment to
provide funding for preventive maintenance,system upgrades, & training/retention of operators.
Develop proactive plan that considers life-cycle costs
and establishes target level of condition, system
reliability, & performance
Consider future availability of replacement parts
Develop preservation guidelines for funding purposes
Develop financial mgmt. plan with separate funding
Develop training, retention, & succession plan
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Findings/RecommendationsFindings/Recommendations –– 77
Share existing technical knowledge within industryto design a tunnel.
Provide range of practical tunnel design options
File design documents electronically with backup
for easy retrieval by controlling owner
Share details & best practices while maintaining security
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Findings/RecommendationsFindings/Recommendations –– 88
Provide education & training in tunnel design &construction.
Offer graduate tunneling courses in university
civil engineering programs
Provide highway tunnel owner & FHWA engineers
with access to academic & industry education &
training on tunnels
Include on-line courses & certificates
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Implementation of Findings &Implementation of Findings &RecommendationsRecommendations
A step in process of developing national
standards & guidance
Provides data for consideration in development
of national tunnel inventory
Implementation lead: AASHTO HSCOBS
Technical Committee for Tunnels (T-20) in
conjunction with FHWA & TRB Tunnels &
Underground Structures Committee (AFF60)
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Implementation of Findings &Implementation of Findings &RecommendationsRecommendations
Planned activities:
Distribution of tunnel safety brochure
Research coordination & development ofneed statements
Technical presentations
Webinars
Articles & papers
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Roadway Tunnel Related TopicsRoadway Tunnel Related Topics NCHRP Task 261 - Best Practices QC/QA for
Tunnels
NCHRP Task 276 - Development of Guidelines forRehabilitation of Existing Highway and Rail TransitTunnels
AASHTO HSCOBS (T-11) research proposal “LRFDSpecifications” for Roadway Tunnels
TRB SHRP 2 - High-Speed Nondestructive TestingMethods for Defects Behind or Within Tunnel Linings
AASHTO Tunnel Manual currently being published
Advanced Notice of Proposed Rulemaking
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