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Haivan Pass Tunnel Construction Project

Haivan Pass Tunnel Construction Project. TUNNEL CONSTRUCTION. Table of Contents. Concept of Tunneling with New Austrian Tunneling Method (NATM) Typical X-section Drawings Tunnel Construction at Haivan Pass Tunnel Construction Project. Concept of Tunneling with NATM.

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Haivan Pass Tunnel Construction Project

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  1. Haivan Pass Tunnel Construction Project TUNNEL CONSTRUCTION

  2. Table of Contents • Concept of Tunneling with New Austrian Tunneling Method (NATM) • Typical X-section Drawings • Tunnel Construction at Haivan Pass Tunnel Construction Project

  3. Concept of Tunneling with NATM • The NATM was developed by Austrian engineers from 1957 – 1965 • The principles of the method: • The support is adequately stabilizing the surrounding ground, so that the rate of convergence towards the tunnel is perceived to be approaching an asymptotic value • Where, after initial support, further support may be applied incrementally • The essence of design of a system of incremental support is to understand the stress-strain properties of the ground and of the tunnel support • Since controlled strain of the ground has to occur in order to develop a changed stress field in the ground aroun dthe tunnel compatible with the degree of support

  4. Concept of Tunneling with NATM Difference of stress distribution around Tunnel

  5. Concept of Tunneling with NATM Conventional tunneling method - Example of steel rib and lagging

  6. Concept of Tunneling with NATM Image of ground arch effect of the NATM support

  7. Concept of Tunneling with NATM Image of ground arch effect of the NATM support

  8. Rockbolts Forepoling MAIN TUNNEL EVA. TUNNEL Typical X-section DrawingsHaivan Pass Tunnel Project Shotcrete TUNNEL CONNECTION – SUPPORT SYSTEM Main Tunnel with Lay by and Pedestrian Cross Passage

  9. Tunnel center Road center MAIN TUNNEL– SUPPORT SYSTEM Typical X-section DrawingsHaivan Pass Tunnel Project Concrete lining Waterproof membrane Shotcrete Theoretical rock line Concrete curbing Electrical cable duct Tunnel side drain Filter cement aggregate Foundation beam for concrete lining Tunnel main sub drainage perforated

  10. Tunnel Construction at Haivan Pass Tunnel Construction Project 1. Drilling tunnel face 2. Charging explosive 3. Excavating and mucking after blasting 4. Shotcreting, if necessary 5. Survey of section (installing steel rib, if necessary) 6. Installing wiremesh, if necessary 7-1. Installing rockbolts 7-2. Cutting head of rockbolts 7-3. Covering head of rockbolts 8. Concreting foundation beam 9. Constructing drain pipe 10. Fixing geotextile 11. Installing waterproofing membrane 12. Lining concrete

  11. Mole drain pipe Technical Term of NATM in the Project Rockbolt Steel rib Wiremesh + Shotcrete Geotextile Waterproofing membrane Lining concrete Foundation beam

  12. Work Sequence of NATM (1/12) 1. Drilling tunnel face

  13. Work Sequence of NATM (2/12) 2. Charging explosive

  14. Work Sequence of NATM (3/12) 3. Excavating and Mucking after blasting

  15. Work Sequence of NATM (4/12) 4. Shotcreting

  16. Work Sequence of NATM (5/12) 5. Survey of section

  17. Work Sequence of NATM (6/12) 6. Installing wiremesh

  18. Work Sequence of NATM (7/12) 7-1. Installing rockbolts

  19. Work Sequence of NATM (7/12) 7-2. Cutting head of rockbolts

  20. Work Sequence of NATM (7/12) 7-3. Covering head of rockbolts by geotextile

  21. Work Sequence of NATM (8/12) 8. Concreting foundation beam

  22. Work Sequence of NATM (9/12) 9. Constructing drain pipe

  23. Work Sequence of NATM (10/12) 10. Fixing geotextile

  24. Work Sequence of NATM (11/12) 11. Installing waterproofing membrane

  25. Work Sequence of NATM (12/12) 12. Lining concrete

  26. Conclusion • Hoping that this Presentation will be of some help toward better implementation of the Project • Project’s homepage: http://haivan.cup.com • For further information, contact Consultant Team at email: hvt-com@dng.vnn.vn

  27. Thank you and Have a good time

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