©GEOVIL KFT.

GEOVIL Kft. GEOTECHNIKAI IRODA

2000 Szentendre, Ady E. u. 44/b.

www.geovil.hu; geovil@geovil.hu

Geotechnical monitoring of tunnell worksDr. Tibor Horváth

GEOVIL Kft. – Canterbury Engineering Association LTD.

2015.04.17.

Tunnel collapses

Köln, 2009.03.03 Budapest 4 metró,Rákóczi tér

Geotechnical monitoring of NATM ( SCL) tunnelling

works

Geotechnical monitoring at deep Excavation

Inklinométer hiánya!

©GEOVIL KFT.

I. Goal of geotechnical monitoring:

Why we need monitoring ?

- Primery: monitoring of natural enviroment and constructed surroundings, before – under and after the

construction works

- Secondary: Changeing and modification of geotechnical parameters, interaction among soil/ rock

and stucture in time ( short term – long term design)

- Tertiary: back analysis, redising of data and design control

What can we measure and what does it worth to measure ?-- strain in the structure and layers;

-- stresess in the structure and layers;

-- pore pressure – total stress – effective stress

©GEOVIL KFT.

Monitoring inside the tunnel

• convergence measurement

• movement around the tunnel

• stress and strain in the lining and arround

the tunnel

In - outside monitoring of tunnells

Part 1. Monitoring in side the

tunnel

• - convergence measurement

• - movement around the tunnel

• - stress and strain in the lining and around

the tunnel

Convergence measurement by geodetical survey

©GEOVIL KFT.

©GEOVIL KFT.

Equipments of geodetical survey

Convergement measuring by Total Station

©GEOVIL KFT.

Convergence measurements- readings and

data development

Convergence measurement curve

Crack measurement on tunnel lining

Part 2. Monitoring inside the

tunnel

• convergence measurement

• movement outside- around the

tunnel

• stress and strain in the lining and around

the tunnel

Extensometer

©GEOVIL KFT.

Application of revers head extensometer

Tunnel face

Cable outgoing and tube

Injected anchor

Head of extensometer -data colector

©GEOVIL KFT.

Borehole

Reverse head extensometer arrangement

Direction of tunnel construction

©GEOVIL KFT.

Reverse head extensometer under Danube river

©GEOVIL KFT.

Part 3. Monitoring in side the

tunnel

• convergence measurement

• movement outside the tunnel

• stress and strain in the lining and

around the tunnel

©GEOVIL KFT.

Pressure cells ( radial and tangential ) installation

Monitoring outside the tunnell

• Surface settlement

• Displacement around the tunnel

• Stress distribution around the tunnel

Part 4. Monitoring outside the tunnell

• Surface settlement• Displacement around the tunnel

• Stress distribution around there tunnel

©GEOVIL KFT.

Settlement readings

Part 5. Monitoring outside the tunnell

• Surface settlement

• Displacement around the tunnel

• Stress distribution around the tunnel

Inclimométer for

horizontal

displacement

Extensometer

for vertical

displacement

Piezometers,

pore pressure

measurement

©GEOVIL KFT.

Inclinometer

©GEOVIL KFT.

Inclinometer installation at slurry trench

excavation. Inclinometers are installed in the

structure.

©GEOVIL KFT.

Piezometer ( pore pressure and water level

measurement)

Part 6. Monitoring outside the tunnel

• Surface settlement

• Displacement around the tunnel

• Stress distribution around the tunnel

©GEOVIL KFT.

Borehole pressure cells)

SMS- Stress Monitoring Station’s readings

Budapest 4. metroline, Bocskai station

Bohehole cells

0

0,5

1

1,5

2

2,5

3

3,5

4

4,5

2008. 5. 19. 23:2

9

2008. 5. 26. 15:5

8

2008. 6. 2. 8:2

8

2008. 6. 9. 0:5

8

2008. 6. 15. 17:2

8

2008. 6. 22. 9:5

8

2008. 6. 29. 2:2

8

2008. 7. 5. 18:5

8

2008. 7. 12. 11:2

8

2008. 7. 19. 3:5

8

2008. 7. 25. 20:2

8

kő

zetn

yo

más -

cell

ák [

bar]

1-cella 2-cella 3-cella 4-cella 5-cella

©GEOVIL KFT.

©GEOVIL KFT.

GEOVIL Kft. GEOTECHNIKAI IRODA

2000 Szentendre, Ady E. u. 44/b

www.geovil.hu; geovil@geovil.hu

Thank you for your kind attention.

Dr. Horváth Tibor