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Riverside County - Orange County

Riverside County - Orange County. Click to edit Master title style. Riverside County - Orange County Major Investment Study Tunneling Considerations in the Santa Ana Mountains MIS Policy Committee April 29, 2005. Click to edit Master text styles Second level Third level Fourth level

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Riverside County - Orange County

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  1. Riverside County - Orange County Click to edit Master title style Riverside County - Orange County Major Investment Study Tunneling Considerations in the Santa Ana Mountains MIS Policy Committee April 29, 2005 • Click to edit Master text styles • Second level • Third level • Fourth level • Fifth level 1

  2. Riverside County - Orange County Click to edit Master title style • Design and Construction Challenges: • Groundwater • Landfill sites • Active and non-active faults • Ventilation • Click to edit Master text styles • Second level • Third level • Fourth level • Fifth level 2

  3. Riverside County - Orange County Click to edit Master title style • Groundwater Issues : • Groundwater levels affect surface ecology • Tunneling should not affect groundwater levels • Watertight linings required • Linings designed for water pressure plus ground loads • Click to edit Master text styles • Second level • Third level • Fourth level • Fifth level 3

  4. Watertight Lining Options: • Cast in place, waterproof permanent lining • Segmented pre-cast concrete lining 4

  5. Drill & Blast Tunnel with Waterproof Permanent Lining

  6. TBM with Segmented, Pre-cast Concrete Lining

  7. Watertight Segmental Concrete Tunnel

  8. Click to edit Master title style • Groundwater Design Challenges: • Groundwater pressures impact approach to construction • Tunnel diameter of 46 feet limits allowable groundwater pressure to a tunnel depth of 700 feet below groundwater surface • Practical limit of 32 inches for segmental liner thickness • Click to edit Master text styles • Second level • Third level • Fourth level • Fifth level 9

  9. Influence of Tunnel Diameter & Depth of Groundwater

  10. Riverside County - Orange County Click to edit Master title style • Challenges of Tunneling • Near Landfill Sites • Face stability problems in tunnel excavation • Potential of encountering contamination • Potential damage to landfill lining • Long term durability and contamination risks • Click to edit Master text styles • Second level • Third level • Fourth level • Fifth level 11

  11. Riverside County - Orange County Click to edit Master title style • Active and Non-active Faults: • Non-active faults characterized by stability or water ingress problems • Active faults characterized by potential for large movements • Elsinore fault active, last movement in 1910 • Click to edit Master text styles • Second level • Third level • Fourth level • Fifth level 12

  12. Riverside County - Orange County Click to edit Master title style • VentilationDesign Considerations: • Smoke control in case of fire • Air quality within the tunnel • Quality of air discharged • Click to edit Master text styles • Second level • Third level • Fourth level • Fifth level 13

  13. Riverside County - Orange County Click to edit Master title style • VentilationOptions • Longitudinal (Nozzles, Central or Jet Fans) • Fully Transverse (supply and exhaust) • Semi-Transverse (supply or exhaust) • Click to edit Master text styles • Second level • Third level • Fourth level • Fifth level 14

  14. Longitudinal Ventilation Longitudinal Ventilation with Central Fans & Saccardo Nozzle Longitudinal Ventilation with Jet Fans Longitudinal Ventilation with Saccardo Nozzle & Shaft Riverside County - Orange County Click to edit Master title style • Click to edit Master text styles • Second level • Third level • Fourth level • Fifth level 15

  15. Fully Transverse Ventilation Fully Transverse Ventilation with Supply and Exhaust Systems Riverside County - Orange County Click to edit Master title style • Click to edit Master text styles • Second level • Third level • Fourth level • Fifth level 16

  16. Semi - Transverse Ventilation Semi-Transverse Supply Ventilation System Semi-Transverse Exhaust Ventilation System Riverside County - Orange County Click to edit Master title style • Click to edit Master text styles • Second level • Third level • Fourth level • Fifth level 17

  17. Exhaust duct Exhaust duct Jetfan Service tunnel & fresh air supply Ø 44’ Ø 20’ Ø 44’ Possible Ventilation System for Deep Tunnel

  18. Possible Ventilation System for Deep Tunnel Possible Ventilation Shaft Layout Riverside County - Orange County Click to edit Master title style • Click to edit Master text styles • Second level • Third level • Fourth level • Fifth level 19

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