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Haivan Pass Tunnel Construction Project TUNNEL CONSTRUCTION.

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Presentation on theme: "Haivan Pass Tunnel Construction Project TUNNEL CONSTRUCTION."— Presentation transcript:

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2 Haivan Pass Tunnel Construction Project TUNNEL CONSTRUCTION

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

4 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

5 Concept of Tunneling with NATM Difference of stress distribution around Tunnel

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

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

8 Concept of Tunneling with NATM Image of ground arch effect of the NATM support

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

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

11 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

28 Thank you and Have a good time


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