haivan pass tunnel construction project
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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. - PowerPoint PPT PresentationTRANSCRIPT
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Haivan Pass Tunnel Construction ProjectHaivan Pass Tunnel Construction Project
TUNNEL CONSTRUCTION
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Table of ContentsTable of Contents
Concept of Tunneling with New Austrian Tunneling Method (NATM)
Typical X-section Drawings Tunnel Construction at Haivan Pass Tunnel
Construction Project
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Concept of Tunneling with NATMConcept 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
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Concept of Tunneling with NATMConcept of Tunneling with NATM
Difference of stress distribution around Tunnel
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Concept of Tunneling with NATMConcept of Tunneling with NATM
Conventional tunneling method - Example of steel rib and lagging
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Concept of Tunneling with NATMConcept of Tunneling with NATM
Image of ground arch effect of the NATM support
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Concept of Tunneling with NATMConcept of Tunneling with NATM
Image of ground arch effect of the NATM support
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Typical X-section DrawingsTypical X-section DrawingsHaivan Pass Tunnel ProjectHaivan Pass Tunnel Project
TUNNEL CONNECTION – SUPPORT SYSTEMMain Tunnel with Lay by and Pedestrian Cross Passage
MAIN TUNNEL
EVA. TUNNEL
Forepoling
Shotcrete
Rockbolts
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MAIN TUNNEL– SUPPORT SYSTEM
Tunnel center
Road center
Typical X-section DrawingsTypical X-section DrawingsHaivan Pass Tunnel ProjectHaivan Pass Tunnel Project
Waterproof membrane
Concrete lining
Shotcrete
Theoretical rock line
Concrete curbing
Electrical cable duct
Filter cement
aggregateFoundation beam for
concrete liningTunnel main sub drainage
perforated
Tunnel side drain
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Tunnel Construction at Haivan Pass Tunnel Tunnel Construction at Haivan Pass Tunnel Construction ProjectConstruction 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
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Technical Term of NATM in the ProjectTechnical Term of NATM in the Project
Rockbolt
Wiremesh + Shotcrete
Steel rib
Geotextile
Waterproofing membrane
Mole drain pipe
Lining concrete
Foundation beam
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Work Sequence of NATM (1/12)Work Sequence of NATM (1/12)
1. Drilling tunnel face
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Work Sequence of NATM (2/12)Work Sequence of NATM (2/12)
2. Charging explosive
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Work Sequence of NATM (3/12)Work Sequence of NATM (3/12)
3. Excavating and Mucking after blasting
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Work Sequence of NATM (4/12)Work Sequence of NATM (4/12)
4. Shotcreting
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Work Sequence of NATM (5/12)Work Sequence of NATM (5/12)
5. Survey of section
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Work Sequence of NATM (6/12)Work Sequence of NATM (6/12)
6. Installing wiremesh
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Work Sequence of NATM (7/12)Work Sequence of NATM (7/12)
7-1. Installing rockbolts
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Work Sequence of NATM (7/12)Work Sequence of NATM (7/12)
7-2. Cutting head of rockbolts
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Work Sequence of NATM (7/12)Work Sequence of NATM (7/12)
7-3. Covering head of rockbolts by geotextile
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Work Sequence of NATM (8/12)Work Sequence of NATM (8/12)
8. Concreting foundation beam
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Work Sequence of NATM (9/12)Work Sequence of NATM (9/12)
9. Constructing drain pipe
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Work Sequence of NATM (10/12)Work Sequence of NATM (10/12)
10. Fixing geotextile
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Work Sequence of NATM (11/12)Work Sequence of NATM (11/12)
11. Installing waterproofing membrane
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Work Sequence of NATM (12/12)Work Sequence of NATM (12/12)
12. Lining concrete
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ConclusionConclusion
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:
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Thank you Thank you
and and
Have a good timeHave a good time