najder eng. cv tomasz najder part 3 2009.06.07 pdf

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Najder engineering® Movägen 3; SE -133 36 Saltsjöbaden/Sweden

Tel: +46 8 717 5714 Fax: +46 8 717 6042 Mobil: +46 (0)704 217 012 Org. no: 490911-2148 VAT-no: SE490911214801 E-mail: [email protected] http://najder.se/

Stockholm, 07.06.2009

Tomasz Najder (Ph.D Civ. Eng.) - part 3

Personalia Date of birth: 1951-08-30

Address: Movägen 3, SE-133 36 Saltsjöbaden (Sweden)

Tel: 0046 (8) 717 57 14, fax: 0046 (8) 717 60 42, mobile: 0046 (0)704 217 012

E-mail: [email protected]

Legal status: married, 2 children (adults).

Experience Since 07/2005 Najder Engineering® Stockholm

Senior Consultant within family company. Activities as Senior Grouting Consultant and Contractor's Representative

For Metrostav- Héðinsfjarðargöng Project 04/2007- 02/2009.

Tunnel Contractor: Metrostav a.s. Divize 5, Na Zatlance 1350/13,

150 00 Praha 5 / The Czech Republic. Metrostav a.s., á útlibú á Islandi, Skeifunni 11, 108 Reykjavík / Iceland.

Project description: - The D&B 2 tunnels with clearance profile according to Norwegian profile T 8.5:

1. Siglufjörður Tunnel: Total length 3.875 m. Mined section length 3.650 m.

Mined cross section 52.83 m2.

Cross section at widening 75.25 m2.

Open cut (west portal) 125 m.

Section with 1% gradient (driven uphill) 1.625 m.

Section with 3% gradient (driven downhill) 2.025 m.

Open cut (east portal) 100 m.

Mined section volume 200.000 m3.

2. Ólafsfjörður Tunnel: Total length 7.150 m. Mined section length 6.925 m.

Mined cross section 52.83 m2.

Cross section at widening 75.25 m2.

Open cut (west portal) 150 m.

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Section with 1% gradient (driven uphill) 1.450 m.

Section with 3% gradient (driven downhill) 5.475 m.

Open cut (east portal) 75 m.

Mined section volume 380.000 m3.

Siglufjörður Tunnel Geology Dominating rock is basalt with sub-horizontal bedding, with changing porosity and with transfer to fine-grained facia. Variability of the massif in the horizontal direction is given by the conditions during the overthrust creation (e.g. gas effects, liquid circulation, cooling of lava), therefore even the transition into the smear of volcanic breccias of soil character are not uncommon.

During the excavation the sedimentary tuff layer was identified for the length of 400m. Its thickness was approximately 1m with slight dip to SW. The encountered dykes are also of basaltic character, NS direction with the steep dip, the thickness usually in metres.

Some encountered faults with the thickness between 1m to 5m are formed by mylonitized rock and they have certain negative impact on the tunnel excavation. Less widespread is NW-SE tectonics, which is probably younger than NS tectonics. It could be characterized by the breccias disturbance of the rock with local caverns.

At the same time the larger water inflows could be encountered.

Ólafsfjörður Tunnel Geology The excavation so far is in volcanic tertiary rocks, mostly basalts and partially volcano-clastics. The basalts are fine to medium grained, compact and also foamed by gas, often with zeolite.

The dykes are formed also by basalt, but more brittle and more broken than in Siglufjörður Tunnel. Volcano-clastic sediments are represented by scoria and red sandstone. In the basalt formations there are interbedds of nearly horizontal fine-grained tuff layers.

The rock classification (according to the Czech Standard CSN 73 1001) is predominantly between R2 –R4, the Q value according to the Barton NGI classification is 0.08 to 7.0.

The rock mass is heavily broken. The main joint sets are orientated either perpendicularly to the tunnel axis, or parallel to it. Their dip is very steep, mostly around 80º.

In many places the rock is heavily broken as a result of tectonic forces. Up to the station km 13.100 the water inflows into the tunnel were not significant with low impact on the excavation itself. Only behind this station the water ingress started to be higher, in the station of km 12.940 the water inflow reached more than 2.000 l/min.

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Siglufjördur Tunnel

Ólafsfjördur Tunnel

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Grouting activities: - Pre grouting with ordinary cement- , micro cement or ultra fine cement grouts and polyurethane

resins (even in extremely cold water temperature like +1 ºC).

- Refilling of caverns as pre- and post grouting with urea-silicate foams.

- Post grouting for sealing and rock stability (consolidation grouting) with cement grouts (even accelerated), polyurethane resins and urea-silicate foams.

- Stopping of water under pressure > 20 bars in warm and very cold water (like +1 ºC).

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References:

1. Håkan Stille, Professor at Royal Institute of Technology KTH, Geokonsult Stille AB.

Mobile: 0046 708-62 29 97 (Sweden).

2. David Cyroň, Ermin Stehlik, Metrostav a.s., divize 5.

Telephone: 00354 840 1311 (Iceland).

3. Björn A. Hardarson, Senior Geotechnical Engineer, GEOTEK.

Telephone: 00354 511 1450 (Iceland).

4. Mike Talliss, Contract Manager, Mott MacDonald and VIJV .

Mobile: 00354 894 6378 (Iceland).

Najder engineeringTel: +46 8 717 5714 Fax

Org. no: 490911-2148 VAT-

5. Johann Kreyer, Project Manager

Mobile: 00354 864 6721

Ph. D Civ. Eng. Tomasz Najder

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Tel: +46 8 717 5714 Fax: +46 8 717 6042 Mobil: +46 (0)704 217 012 -no: SE490911214801 E-mail: [email protected]

Project Manager, Landsvirkun.

00354 864 6721 (Iceland).

Tomasz Najder

/Sweden Mobil: +46 (0)704 217 012

[email protected] http://najder.se/

najder eng. cv tomasz najder part 3 2009.06.07 pdf

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