Hampton Roads Bridge Tunnel Expansion: Overview of Tunnel Construction Methods
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1 Hampton Roads Bridge Tunnel Expansion: Overview of Tunnel Construction Methods February 21, 2018 James S. Utterback HRBT Project Director Virginia Department of Transportation
2 Ten Hampton Roads Tunnels Chesapeake Channel Tunnel (1964) Hampton Roads Bridge-Tunnel (1957 & 1976) Thimble Shoal Tunnel (1964) Monitor-Merrimac Memorial Bridge- Tunnel (1992) Midtown Tunnel (1962 & 2016) Downtown Tunnel (1952 & 1987) 2
3 65 Years of Tunneling in Hampton Roads Downtown Tunnel #1 Hampton Roads #1 Midtown Tunnel #1 Thimble Shoal #1 & Chesapeake #1 Hampton Roads #2 Downtown Tunnel #2 Monitor-Merrimac Midtown Tunnel #2 9 tunnels are steel-shell immersed tubes 1 tunnel is concrete-box immersed tube Future tunnel #11 at Thimble Shoal will be bored tunnel 3
4 8 4
5 Proposed Tunnel Alignment (Hampton Side) 5 5
6 Proposed Tunnel Alignment (Norfolk Side) 6 6
7 Proposed Lane Configuration for Tunnel and Approach Bridges concept in each direction: 2 free General Purpose lanes 1 full-time HOT lane 1 peak-hour HOT lane on left shoulder 7
8 Tunnel Considerations Landside work has risks but is largely conventional Tunnel work is less conventional and will generate greater risks from a contracting standpoint E.g. Midtown Tunnel contract s limit of liability was tested against a potential scenario involving construction impacts to existing tunnel This is a rare location where both immersed-tube and boredtunnel construction methods are feasible All ten Hampton Roads tunnels to date have been immersed tubes Until recently, bored tunnels were not feasible in soft soils But recent advances in technology now make bored tunnels possible in soft soils These methods were directly compared in the nearby Thimble Shoal Tunnel procurement in
9 Immersed-Tube Tunneling (ITT) Images property of respective owners. 9
10 New Midtown Tunnel Section Utility Corridor Jet Fans Egress Corridor Images property of respective owners. 10
11 Parallel Thimble Shoal Tunnel (initial concept) Proposed Thimble Shoal Channel Tunnel (SB Traffic) #2 Island Existing Thimble Shoal Channel Tunnel (NB Traffic) Approximate Edge of Existing Island #1 Island 11
12 Bored Tunneling Tunnel boring machine Bertha, recently at work in Seattle Images property of respective owners. 12
13 Interior of SR99 Tunnel in Seattle (57.5 external diameter, 52 internal diameter) 13
14 Key Differences between Bored and Immersed-Tube Tunneling Alignment ITT alignment must be further away from existing tunnel (Hampton Roads typical practice about 200 feet) Bored tunnel can be much closer to existing facilities (estimate on other projects about one diameter 50 feet) Geotechnical ITT method has limited concern for soil properties, since soil along tunnel path is dredged out and removed Bored method is specifically tailored to local soil properties Environmental and Permitting Section 408 coordination with marine stakeholders / federal channel Section 103 concurrence for offshore disposal of ITT spoils Joint permit covering upland disposal of bored-tunnel spoils 14
15 Immersed Tunnel Considerations Concept design Approx. 7,500 ft. long Approx. 3.5 million cubic yards dredged material Dredged trench approx. 90 ft. wide with 3:1 side slopes Navigational considerations at channel Trench dredging Placement & screeding of gravel bedding Immersion of tunnel elements Placement of cover fill Other navigational considerations Barge transport of dredged material for ocean disposal Island expansion (fill & armor stone) Limited additional geotechnical investigation is anticipated 15
16 Bored Tunnel Considerations Concept design Approx. 8,300 ft. long Deeper than immersed-tube tunnel because more cover is needed e.g. for buoyancy control therefore tunnel is longer 4% roadway grades likely require island expansion lengthwise Approx. 1 million cubic yards excavated tunnel material Ground improvement at islands to support weight of tunnel boring machine Navigational considerations Additional geotechnical investigations Island expansion (fill & armor stone) 16
17 Procurement Milestones and Next Steps Initial outreach to industry in April 2017 Follow-up with potential proposers in January/February 2018 Firms expressed interest in both tunnel-construction methods Milestones Target Date Request for Qualifications December 15, 2017 Qualifications Due March 2, 2018 Shortlist Announcement April 2018 Request for Proposals Spring 2018 Contract Award Early 2019 Project Completion
18 Questions? 18
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TUNNEL CROSS SECTION 42.0' CLEARANCE ENVELOPE (36' W x 16.5' H) 24.0' WITH VENTILATION ALTERNATIVE CENTRAL TRAFFIC BARRIER FOR SOME CONCEPTS 21.0' WITHOUT VENTILATION 1.5' 6.0' 12.0' 12.0' 6.0' 4.0' 0.5'
204 - EXCAVATION AND BACKFILL FOR STRUCTURES SECTION 204 EXCAVATION AND BACKFILL FOR STRUCTURES
SECTION 204 EXCAVATION AND BACKFILL FOR STRUCTURES 204.1 DESCRIPTION Excavate for the structures as shown in the Contract Documents. Unless specified otherwise, backfill the completed structures to the
Initial Construction and Maintenance Costs
VI. Initial Construction and Maintenance Costs This section documents the state of knowledge regarding the initial and maintenance costs associated with terminal groin structures. As part of the cost study,