haivan pass tunnel construction project tunnel construction

Haivan Pass Tunnel Construction ProjectHaivan Pass Tunnel Construction Project

TUNNEL CONSTRUCTION

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

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

Concept of Tunneling with NATMConcept of Tunneling with NATM

Difference of stress distribution around Tunnel

Concept of Tunneling with NATMConcept of Tunneling with NATM

Conventional tunneling method - Example of steel rib and lagging

Concept of Tunneling with NATMConcept of Tunneling with NATM

Image of ground arch effect of the NATM support

Concept of Tunneling with NATMConcept of Tunneling with NATM

Image of ground arch effect of the NATM support

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

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

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

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

Work Sequence of NATM (1/12)Work Sequence of NATM (1/12)

1. Drilling tunnel face

Work Sequence of NATM (2/12)Work Sequence of NATM (2/12)

2. Charging explosive

Work Sequence of NATM (3/12)Work Sequence of NATM (3/12)

3. Excavating and Mucking after blasting

Work Sequence of NATM (4/12)Work Sequence of NATM (4/12)

4. Shotcreting

Work Sequence of NATM (5/12)Work Sequence of NATM (5/12)

5. Survey of section

Work Sequence of NATM (6/12)Work Sequence of NATM (6/12)

6. Installing wiremesh

Work Sequence of NATM (7/12)Work Sequence of NATM (7/12)

7-1. Installing rockbolts

Work Sequence of NATM (7/12)Work Sequence of NATM (7/12)

7-2. Cutting head of rockbolts

Work Sequence of NATM (7/12)Work Sequence of NATM (7/12)

7-3. Covering head of rockbolts by geotextile

Work Sequence of NATM (8/12)Work Sequence of NATM (8/12)

8. Concreting foundation beam

Work Sequence of NATM (9/12)Work Sequence of NATM (9/12)

9. Constructing drain pipe

Work Sequence of NATM (10/12)Work Sequence of NATM (10/12)

10. Fixing geotextile

Work Sequence of NATM (11/12)Work Sequence of NATM (11/12)

11. Installing waterproofing membrane

Work Sequence of NATM (12/12)Work Sequence of NATM (12/12)

12. Lining concrete

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:

hvt-com@dng.vnn.vn

Thank you Thank you

and and

Have a good timeHave a good time